Wednesday, August 22, 2012

Making Medicine, Part 3 of 5: Making a Fresh Blue Vervain Maceration

This is the third in a series of five posts in which I am using the process of wild harvesting and making a fresh herb tincture of blue vervain (Verbena hastata) as an example to explain in detail the process of making medicine. Part 1 of this series was posted on July 9th, Part 2 on July 15th. This series started as a single post, then became two, then three, then four, now five. As it progresses I realize that there is a lot that needs explaining. I have decided to do that thoroughly so that I can reference it from future posts rather than having to repeat information.

In the second post in this series we got up to the point where the blue vervain had been chopped up and was ready for making a fresh herb tincture. Now we are going to discuss making a tincture in detail. This is essentially a two part process. The first part of this process involves macerating the herbs. Maceration is the technical term for soaking the herbs in our extraction medium or menstruum. This will be the focus of this post. I will address pressing and filtering the maceration to make the tincture itself in the last post.

I discussed the important issues concerning wild harvesting and preparing blue vervain for macerating in the first two parts of this series. The next step is to put the chopped herb into a jar. This requires two things, a funnel and a jar.

The kind of jar that we use is very important. Firstly, it needs to have a wide opening so that it is easy to get the herbs into it and out again when it is finished macerating. Secondly, it is preferable that the jar is made of dark coloured glass. Amber seems to work best and it is less expensive than cobalt, which is the other major choice for dark coloured glass. Amber jars reduce exposure to light, which is one of the most important causes of degradation of the constituents of herbs. It is therefore important that we minimize the amount of light that our herbs and our maceration are exposed to. To accomplish this during the initial preparation, the herbs are chopped, put into a jar, covered with menstruum, and sealed as quickly as possible.

I know many herbalists who use Mason jars for macerating tinctures. This is probably because they are cheap and readily available. Some don't realize the importance of minimizing exposure to light. Others claim that the minimum light exposure that occurs while preparing and shaking their maceration is not significant as long as the jars are stored in the dark. It is very important to me to ensure that the medicines I prepare are of the highest quality and I am always experimenting with ways to improve this process. I have prepared two macerations of the same herb at the same time in the same way, one in an amber jar and the other in a Mason jar. Both were stored in the dark in the same location. I allowed them to macerate for the same amount of time and pressed them the same way on the same day. When I pressed the two macerations, the one that was prepared in the Mason jar was already significantly oxidized and the one that was in the amber jar had oxidized very little. You can tell that a tincture is oxidized because it is darker (usually more brown) in colour.

Once we press a tincture (which I'll discuss in the fourth and final post in this series), the constituents begin to rapidly degrade. There are a couple of ways we can slow this process down, but we can't prevent it. It is much easier to minimize this degradation during the initial preparation and maceration process. We can maximize the quality and potency of our tincture by minimizing the degradation of its chemical constituents up to the point of pressing it. This will also maximize its shelf life once it is pressed.

The final point that I would like to make about Mason jars is that, in order to prevent the lid from rusting, it is coated with plastic that contains bisphenol A (BPA), a hormone disruptor that readily dissolves into our maceration and accumulates in our body tissues. BPA has many known and probably many more unknown negative health effects. There are numerous sources of this environmental toxin and most people have significant levels in their body tissues and fluids. It's not something that we want in our tinctures! There are Mason jars out there that have a plastic lining that is "BPA Free", however, the BPA has been replaced by bisphenol S. BPS has similar hormone disrupting properties as BPA.

That brings us to the discussion of lids. Our wide-mouthed amber jars need a lid. Metal lids are not recommended because they either have a plastic coating that contains BPA or similar chemicals, or they have no coating and will rust. As a result, although I'm not a big fan of plastic, it is the best option as long as it's the right kind of plastic. The two options for lids that I recommend are high-density polyethylene (HDPE, ♴) and polypropylene (PP, ♷). Neither of these plastics leach BPA, pthalates or other known hormone disruptors. That doesn't mean that other toxins won't be discovered in the future that leach from these plastics, but at this point these are the safest plastic lids. If our lids don't have a liner, the softness of the plastic helps the jar seal when the lid is tightly screwed on, but occasionally it doesn't seal perfectly and our jar could leak a tiny amount. That also means fresh air (and more oxygen) getting into our maceration and increased oxidation of the chemical constituents. If we want the best seal, we need to use lids with a liner. Paper liners are not recommended because they will dissolve, and other liners such as polystyrene and polyvinyl chloride are toxic. The best liner is one made of low-density polyethylene foam (LDPE, ♶), also called an F217 liner. This is another plastic that is not yet know to leach any toxic chemicals. The last point on lids is that the liner must be loose, not glued in place, because the glue will also dissolve in our tincture. This also allows us to remove the liner for more thorough cleaning between uses. So to summarize, I recommend using a HDPE or PP lid either without a liner, or ideally with a loose (unglued) F217 liner.

The jars that I use are called amber round packers. These jars have a shoulder, which means that although they have a wide opening, it is not as wide as the full width of the jar like Mason jars. The volume of these jars is usually measured to the top of the shoulder and doesn't include the neck. Since when we macerate tinctures we need to fill the jar almost to the top, this kind of jar actually holds more liquid than the stated volume of the jar. The sizes that I use are 250 ml (8.5 oz), 500 ml (16.9 oz) and 950 ml (32.1 oz). However, when we fill these jars to 1/2 cm (3/16 inch) from the top, they actually contain 270 ml (9.1 oz), 540 ml (18.3 oz) and 990 ml (33.5 oz), respectively. I use the largest size for the herbs that I use the most and the middle size for the herbs I use less. The smallest size I only use for herbs that I haven't worked with. I will initially make a smaller amount of tincture that I use to do some preliminary research on the properties of the herb. Keep in mind that I am making tinctures for use in my practice and school. Anyone who is making tinctures for personal use will not require such large quantities. For personal use or for a family, making approximately 250 ml of tincture will be sufficient for a one year supply of most herbs. Rarely you might need 500 ml, but only for herbs that you use a lot. The amber packers also come in a 120 ml (4.1 oz) size, which actually contains 130 ml (4.4 oz) when filled correctly for a maceration. I recommend to my students to use the 120 ml and 250 ml sizes for most herbs for personal or family use, and only rarely the 500 ml size. Also, it is better to macerate a tincture in several smaller jars than in one large one. This is because, assuming that we make our initial maceration in a conscientious way, the greatest amount of degradation of the active constituents will occur after we press the tincture. So we don't want to press our tinctures in quantities that will require a long time to use. I recommend macerating tinctures in a jar size that will produce enough tincture to last about three to six months. I will discuss this a bit more in the fourth post in this series.

Amber round packers: 120 ml, 250 ml, 500 ml and 950 ml sizes.
Note wide-bottom funnel in the 250 ml jar.

Enough about jars, the last thing we need is a funnel. We need a funnel with a large opening at the bottom so that our chopped herbs can easily pass through it. The opening should be as large as possible, but narrow enough that the bottom of the funnel will insert at least two to three centimetres (one inch) into the neck of the jar so that it doesn't fall out easily. You can usually get a funnel with a wide bottom in a kitchen or automotive store, or department of a larger store. They are used for funnelling solids or highly viscous liquids like motor oil. If you can't find one you can always cut a regular funnel or make your own by making a cone from a piece of blank paper (no ink on it) or thin cardboard. Make sure you tape or staple it so it holds its shape and doesn't unravel while you are pouring something through it.

Glass funnels are best, but they are expensive and easily broken. Metal funnels aren't recommended because metal acts as a catalyst for oxidation reactions, which is problematic for chopped herbs because their inner tissues are exposed. Using a metal funnel will increase the rate of oxidation of the chopped herb material as it passes through. Once more, that leaves us with plastic. As with our jar lids, it is best to use HDPE (♴) or PP (♷). Polyvinyl chloride (PVC, ♵), polystyrene (PS, ♸) and other (O, ♹) miscellaneous plastics are not recommended because they are know to leach BPA, pthalates and other hormone disrupting toxins. Nothing that is made of these plastics should be allowed to come in contact with our herbs, maceration or tinctures.

At this point our blue vervain herb has been weighed to determine the correct amount that we need to make a 1:5 fresh herb tincture in a jar that holds 990 ml. It has been chopped to the appropriate level of fineness. Now we pour it through a funnel into a jar. If this is done too quickly, sometimes the herb will get stuck in the funnel. Tapping the funnel on the rim of the jar (with the end still inside the jar) will usually remedy this. If that doesn't work I will use the handle of a wooden spoon or a chopstick as a plunger to force the herb through.

Most herbs, if they have been chopped fine enough, will easily fit in our jar. However, some herbs are less dense because they have a lot of air spaces in their tissues. This is particularly true of many herbs from the Mint family (Lamiaceae). For herbs that don't easily fit in our jar, once more I will use the handle of a wooden spoon or a chopstick to compress the herb material in the jar so that it will all fit.

Once all of the herb is in the jar we need to fill up the jar with our menstruum. Traditionally, tinctures are macerated using a solution of ethanol (grain alcohol) and water. I'm going to begin this discussion by looking at alcohol. Back in the 80's, when the diagnosis of overgrowth of yeast (Candida albicans) became popular among many natural health practitioners and health food advocates, many people were promoting various anti-Candida diets that were based on a few common themes. One of the themes that emerged out of the general Candida concern was an anti-alcohol element. The basic idea is that consumption of any amount of alcohol will promote the overgrowth of yeast in our body. This led to some practitioners and authors of books on natural healing to claim that tinctures are not a good way to use herbs because of their alcohol content. This notion was further exacerbated by herbal manufacturers who, in attempting to capitalize on this trend, promoted the idea in their literature in an attempt to gain more market share by marketing the supposed alternative: glycerites or "glycerin tinctures". These are herb extractions that use some percentage of glycerin and water as a menstruum instead of alcohol and water. These concerns are unfounded. Firstly, because glycerin is actually a kind of alcohol. In fact, mold can grow in glycerin, but not in ethanol. Secondly, because glycerites are not a suitable alternative to tinctures. Glycerin is not as good an extraction medium or preservative for most of the chemical constituents of herbs. And finally, because the amount of alcohol consumed in a typical dosage of tincture is not in the least bit harmful, nor does it promote the growth of yeast. It is true that over-consumption of alcohol has a lot of potential negative health consequences, but the amount of alcohol consumed by taking tinctures, even at acute doses, is completely acceptable. The difference in the quality of tinctures versus glycerites is many times more significant than any potential negative consequences from consuming such tiny amounts of alcohol.

Other forms of liquid extractions of herbs such as acetics or "vinegar tinctures", which are extracted using some percentage of vinegar and water, have also been suggested as alternatives to tinctures. Although solvents such as glycerin and vinegar are good at extracting some of the chemical constituents of herbs, for the majority of constituents alcohol is better. Alcohol is also by far the best preservative for liquid extractions (not including toxic solvents such as methanol and benzene).

Before I go any further on this, I want to clarify two points that I just made. Firstly, the notion that yeast and other "parasites" are the primary cause of most health imbalances that people suffer from has been around a long time. It is called "germ theory" and it was initially developed by Louis Pasteur, a 19th century microbiologist. It is also one of the major limiting assumptions of modern medicine. As a result of the acceptance of Pasteur's theory into the reductionistic medical paradigm, medical researchers in the late 1800s and early 1900s looked for microbial causes of just about every illness and attempted to develop vaccines to treat them (this was before antibiotics). I am not suggesting that this approach hasn't resulted in useful medical treatments that have helped many people. However, the limitation of this theory is that it doesn't get to the root of the problem. In most instances, infectious diseases are caused by organisms that are in our immediate environment and often in or on our body all of the time. The major cause of illness is not the organism in and of itself, it is the lack of health and vitality of the person affected by it. This is directly the result of the dietary and lifestyle choices that we make every day.

Now lets fast-forward to the 1980s when Candida became a popular concern. Since that time many practitioners of natural healing disciplines have jumped on the germ theory bandwagon. It's the same old superficial approach, looking for an easy scapegoat instead of getting to the root of the problem. It is true that whenever there is an over proliferation of any microorganism, the presence of the organism will put additional stress on a person. Sometimes (but not always) it may be necessary to use treatment methods that directly affect the organism to help reduce the stress load on their body. However, using herbs to support the person's overall health and vitality and educating them about how the way they live affects their health and how they can improve on it is the essence of the treatment. And, for the record, in situations where it is necessary to directly address the "parasite", if herbs are our modality of choice, tinctures are usually the preparation of choice - and that means alcohol!

The whole issue of "parasites" is quite complex and maybe I'll do a post on it at some point in the future. For those who are interested, here is a link to an article that I wrote for the summer 2000 issue of Vitality Magazine (Dealing With Parasites). This one is too old to be archived on the Vitality website, so I have posted it on the Herbal Resources page of the Living Earth website.

The final point that I would like to clarify concerning this aspect of the alcohol issue is that, although it is true that the amount of alcohol in a typical dose of tincture isn't going to be harmful to most people or aggravate some condition that they have, I am not suggesting that the alcohol in tinctures isn't going to negatively affect anyone. There are people who have allergy-like reactions to alcohol. Also, some people who have a history of alcoholism are so sensitive to alcohol that the taste or smell of even a very dilute amount affects them in a negative way. However, collectively these groups make up a very small minority of the population. Although for them it will be necessary to use herbs in some other form, even though from a therapeutic point of view it may be somewhat less effective, for the vast majority of people tinctures are the preparation of choice for using herbs in most situations.

Now I am going to discuss the menstruum that I use to make tinctures. This is also going to require a bit of explanation as I do not follow the traditional method of determining the menstruum for making tinctures. Traditionally, tinctures were made using some percentage of alcohol and water. The percentage of alcohol used varied depending on the herb. These percentages have been recorded in various herbal pharmacopoeias. However, it is my experience that using these prescribed alcohol percentages is less than ideal. Firstly, these percentages were determined at a time when herbalism, alchemy, chemistry and reductionistic medicine had been in the process of diverging from their common roots. The reductionistic scientific model was beginning to coalesce into its current form. At that time, like today, some herbalists in the West practiced according to a more traditional, holistic model, others according to a more reductionistic model, and still others fell somewhere in between. The growing influence of the materialistic, reductionistic scientific paradigm led many to believe that the therapeutic actions of plants were due exclusively to their chemical constituents. In addition, those who subscribed to this model believed that the actions of medicinal herbs could be reduced primarily to the properties of a single constituent or a few chemically-related constituents. As a result, the recommended menstruum for macerating tinctures was determined by figuring out the best percentage of alcohol for extracting the single or a few related constituents that were believed to be responsible for the therapeutic actions of the plant. The recommended alcohol percentages for extracting individual herbs that are recorded in the various pharmacopoeias were derived in this way.

From the perspective of an holistic paradigm, the therapeutic actions of an herb are understood to be the result of synergistic interactions of all of its chemical constituents. As a result, using a particular alcohol percentage intended to produce the best extraction of an individual constituent is not ideal because that alcohol percentage might not work well or even be detrimental to the extraction of other chemical constituents. Therefore the ideal menstruum will be one that gets the best extraction of the largest number of the chemical constituents of the herb. Here's a somewhat extreme example of what that might look like. Myrrh resin (Commiphora myrrha) is usually extracted using a very high alcohol percentage, typically 80-100%. This is because many of the components of the resin are very poorly soluble in water but very soluble in high alcohol concentrations. However, myrrh also contains polysaccharides. Until the last couple of decades, polysaccharides were completely ignored by researchers because there were no known mechanisms by which they could be absorbed or have any systemic therapeutic action from the digestive tract. The conventional belief was that they are either broken down into their component sugar units, absorbed and used as fuel by our body, or they are "fibre" and just pass through the digestive tract without doing much of anything (except making it easier to have a bowel movement). In addition, reductionistic researchers were always looking for relatively unique, strong, drug-like constituents to explain the actions of medicinal herbs. This is partly due to their philosophical orientation, and also partly because much of the research was oriented towards finding chemicals that could be used as the basis for developing new drugs. Ubiquitous constituents like polysaccharides, organic acids and polyphenols were considered uninteresting. How could something that is found in most or all plants be important when considering the unique therapeutic actions of individual herbs? In fact, any herbs that weren't known to contain very strong constituents such as alkaloids, saponins or cardioactive glycosides were considered useless and their traditional use irrational. Researchers have fairly recently changed their tune on this one, but that was the conventional belief of the time. So, getting back to myrrh, no one would have considered polysaccharides important when determining an alcohol percentage to extract the resin. However, the polysaccharides are very important, particularly for the immune stimulating properties of myrrh. Unfortunately, polysaccharides aren't soluble in alcohol. In general, their solubility tends to start dropping off at around 20% alcohol and by 40% they are virtually insoluble. So they are more or less absent from myrrh resin tincture when it is extracted using very high alcohol percentages.

Another issue is that the alcohol percentages recorded in many of the pharmacopoeias for extracting individual herbs were usually developed by practitioners and researchers who used herbs as simples (single herbs). At present, most Western herbal traditions use herbs in formulations. This is problematic because when we mix different tinctures that are extracted using different alcohol percentages, the alcohol percentage of the mixture is going to be different than the alcohol percentages of the individual tinctures. This means that chemical constituents that don't extract well at the alcohol percentage of the mixture will precipitate out of solution to varying degrees and either deposit on the surface of the bottle or settle out in a less absorbable form.

In considering all of this, I came to the following conclusions:

  1. That I needed to determine the best menstruum for extracting the largest number of constituents of herbs; and,
  2. For the system of herbalism that I practice, in which herbs are almost always used in formulations, it is best to use the same menstruum for all of the tinctures that I prepare. That means that I am looking for a menstruum that will extract the largest number of constituents in all herbs, not just an individual herb that I am macerating at any given time.
After doing some research on the solubility of various constituents and experimenting with various concentrations of possible solvents, the menstruum that I finally settled on is 60% water, 30% alcohol and 10% glycerin for tinctures made from dried herbs, and 56% water, 33% alcohol and 11% glycerin for tinctures made from fresh herbs in order to compensate a bit for the water content of the fresh herbs. Since I make almost all of my tinctures from fresh herbs, it is the latter menstruum that I normally use. I have used this menstruum for all of my tinctures for the last ten years and found it to be superior to using alcohol alone and in different (and usually higher) concentrations for different herbs.

The beauty of this menstruum is that, although glycerin doesn't extract constituents that are highly alcohol soluble as well as alcohol, it seems to work better for these constituents when combined with alcohol as long as the alcohol is in a higher proportion. On the other hand, glycerin is very good at extracting constituents that that aren't very soluble in alcohol, like polysaccharides, and helps to stabilize them in solution. So the net result is that this menstruum extracts constituents that are very soluble in alcohol more like a 35-40% alcohol solution, whereas it extracts constituents that are poorly soluble in alcohol more like a 20-25% alcohol solution. One easy way to demonstrate this is to make two tinctures of marshmallow root (Althaea officinalis), one using 40% alcohol and the other using 30% alcohol and 10% glycerin. When we press these tinctures, the latter one will be much thicker and more mucilaginous. This is because the mucilage content of the herb is primarily made up of polysaccharides which extract much better in this menstruum.

Marshmallow (Althaea officinalis).

On the other hand, if I repeat this experiment and make two different macerations of a very aromatic plant that contains a significant amount of essential oil such as wild bergamot herb (Monarda fistulosa), or a plant that contains bitter alkaloids such as celandine (Chelidonium majus), I can not detect any noticeable difference between the aroma and flavour (except for the sweetness of the glycerin) of the two different versions of the tincture, indicating that the essential oil and alkaloid constituents are extracting at a similar level in both cases.

Wild bergamot (Monarda fistulosa).

This process of assessing the quality or identity of an herbal preparation on the basis of properties that are accessible to our physical senses, such as flavour, aroma, appearance, etc., is called organoleptic analysis. Our senses, when suitably trained, are incredibly adapted to this kind of analysis, as in the case of people who can detect the subtleties of a fine wine. The same applies to herbal tinctures. To me, the ultimate test of the quality of a tincture is how closely its flavour and aroma resemble that of the fresh, living herb.

The final issue with regard to the menstruum that I use is that some people might argue that, even if this menstruum can extract constituents the are highly soluble in alcohol similar to a 40% alcohol solution, that is not enough alcohol to extract them efficiently. However, most herbal constituents are somewhere in the middle with regard to their degree of water and alcohol solubility and extract in the equivalent of a 30-40% alcohol solution very well. In addition, constituents that extract best in a high alcohol solution, like monoterpenes, alkaloids and resins, extract fairly well in this menstruum and are also very potent constituents that still have a strong therapeutic action even in a slightly lower concentration than is obtainable using higher alcohol concentrations. The fact that I am preparing 1:5 fresh herb tinctures is also a factor. They will dissolve in a 1:5 maceration better than a 1:2 or 1:1 maceration because there is more menstruum for them to dissolve into in a 1:5 extraction. It is also doubtful that our body can absorb these constituents efficiently in higher concentrations anyway. Since my goal is to create tinctures in which the constituents are in a similar proportion relative to each other as in the living herb, using this menstruum makes more sense. I am not extracting an essential oil, I am extracting an herb!

Another consideration is whether or not we might get an even better extraction if we maintain the alcohol at 30% and increase the amount of glycerin. This might be a bit better for some constituents, however, from my experience it seems to be important that the alcohol percentage is a fair bit higher than that of glycerin. In addition, I find that using more than 10% glycerin makes the tincture too sweet and many people find higher concentrations of glycerin somewhat irritating in their throat. Although the slight sweetness of this menstruum is useful in terms of making some herbs more palatable, if it's too sweet it masks the flavour of the herbs too much. Some of the therapeutic properties of herbs are enhanced by tasting the herb, presumably by reflex actions from the taste receptors in our mouth. For instance, there are many therapeutic properties that are related to the bitterness of an herb. Tinctures that contain more than 10% glycerin mask the bitterness too much and reduce the effectiveness of these properties.

The last point on glycerin is that we always use food grade vegetable glycerin. There is lower grade glycerin that is used for other purposes, but it is not suitable for making tinctures.

OK, so now we've made it through another long explanation and we can finally get back to our blue vervain herb that is chopped up sitting in our jar. To summarize, the herb is in a 950 ml amber round packer that will actually hold 990 ml when filled to the appropriate level. It has a polypropylene lid with a loose low density polyethylene liner. Now we want to fill up the jar with our menstruum, which contains 56% water, 33% alcohol and 11% glycerin. We want to minimize the amount of air space in the jar once it is filled because the more air that is present, the more oxidation that will occur while the herbs are macerating. However, we must have some air inside because we need to be able to shake the maceration to help the constituents dissolve. This only works if there is a bit of air inside because it is the movement of the air bubble that shakes up the contents of the jar. I have found that the maximum amount that we can fill the jar and still allow the contents to be shaken efficiently is about 1/2 cm (3/16 inch) from the top. Once we fill the jar to 1/2 cm from the top, the lid must be screwed on tight enough that it doesn't leak, but not so tight that we split the lid (which is possible with plastic lids if we get over zealous).

It is important to rinse the outside of the jar once it is sealed so that there is no residue from the plant juices or glycerin (from the menstruum). Otherwise it is possible that mold will grow on the jar while it is macerating.

The final thing we need to do is put a label on the jar. I store my macerations in boxes, so I put the label on the lid. It needs to contain the following information:

  1. The name of the herb and part used.
  2. The concentration of the maceration.
  3. Whether its a fresh or dried herb extraction.
  4. The date it was made.
For the blue vervain tincture that I made I wrote the following on the label:

Verbena hastata herb
1:5 Fresh
July 1, 2012

Now that our maceration is sealed and labeled, it is necessary to shake it regularly for awhile. This helps to get the constituents into solution and to break up the plant tissues a bit as they soak and soften, which facilitates the release of the constituents from the plant. I usually shake a new maceration vigorously for about 20-30 seconds twice a day for the first week, then once a day for another week or two. After that I shake them once or twice a year until I am ready to press them. Once I've decided to press a maceration to make the tincture, I will shake the jar once a day for a week immediately prior to pressing it.

The last little complication in this process is that plant tissues contain air spaces. Some more than others. As the plant material is soaking, the air spaces in the macerating herb will gradually fill with menstruum. This process takes a week or two and the shaking of the maceration helps to facilitate this process. Once the plant tissues are fully saturated with our menstruum, the size of the air space in our bottle will have grown. At about the two week point, just before I stop shaking the jars regularly, I will open them and top them up with additional menstruum back to 1/2 cm below the top. When we do this, it is important that we carefully clean the outer rim of the jar and the inner surface of the lid that comes in contact with the rim. A very small piece of paper towel or a section of toilet paper works well for this. There are two reasons why this is necessary. These surfaces will get coated with tincture and bits of plant material. If we don't clean it, the lid might not seal properly when we screw it back on. Also, if there is any tincture present on the rim, once the alcohol evaporates the remaining residue is a suitable medium on which mold can grow. Mold can't grow right into the tincture, but if it is on the rim it could contaminate our tincture when we pour the maceration out of the jar when it is finished.

Herbal macerations need to be stored in the dark at all times. I store mine in boxes with dividers. When I don't have boxes with dividers I make the dividers.

I have found that the ideal amount of time to macerate tinctures is three months or more. The absolute minimum amount of time is one month, but three months is preferable. Prior to three months the macerating herbs haven't had the opportunity to soften enough to be able to efficiently extract their constituents. After three months most of the constituents of the herb are either in solution or extractable when we press it because the macerating herb material will have softened sufficiently. Additional time macerating will only slightly increase the potency of the tincture. That being said, we don't want to press a tincture until we are ready to use it. As I've stated earlier, the greatest amount of degradation of the constituents of an herb occurs once the tincture is pressed. So it is best not to press a tincture until we need it and to macerate it in quantities that we will be able to completely use within three to six months of pressing it.

One of the great things about macerating herbs is that as long as we prepare our herbs and maceration in a conscientious way to maximize the quality and potency of our tincture, and the macerations are sealed well, stored in the dark and not opened, macerating tinctures will maintain their quality and potency for a very long time. I have tinctures that macerated for 10 years or more before I pressed them and they are just as good as those that were pressed within a few months. The one exception to this is herbs with a lot of aromatic sulfur-containing compounds, such as those from the Onion (Alliaceae) and Mustard (Brassicaceae) families. These kinds of constituents tend to be less stable in solution. It is best to press tinctures of herbs from these families within a year or two and use them within three to four months once they are pressed.

This is the end of Part 3 of this series. In Part 4 I'll discuss the different kinds of equipment that are available for pressing and filtering the maceration.


  1. I'm trying some of your suggestions about glycerin, albeit along with the traditional alcohol ratios for making tinctures (since I had already started them 2 days before reading this) and I'm excited to see how they turn out. I just added in some good quality glycerin (eyeballed it, to be scientific) to what I had already started.

    It's really funny because my old herbal mentor back in Florida taught us to make tinctures with vinegar and to put them on shelves outside to catch the sun's light. I think she thought somehow this infused them with sun energy or something. She went to VT to study directly with Gladstar so I'm not sure where she got that from.

    Anyway, I have always preferred using alcohol and distilled or spring water for making tinctures and I wanted to say how much I enjoyed this as well as your blog in general.

    But I do want to ask when we will see part 4 of this series? I'd love to see the conclusion.

    1. I kind of forgot this one when I got really busy in August and September. I hope to conclude it soon.

  2. Thank you for your very thorough blog, this has been interesting to read...

    I am wondering about the alcohol that you reference using. Am I understanding correctly that you are using an 80 proof alcohol and this makes up 33% of the liquid volume in your jar. There for this example given in your blog to fill a 990 ml bottle the menstrum would be made of 554 ml of water, 327 ml of (80 proof) alcohol, and 110ml of glycerin? Also, do you have an opinion on the type of alcohol used?

    Thanks for clarifying!!

  3. I am referring to the actual alcohol percentage of the menstruum. You would only use 33% of your alcohol source if it is 100% alcohol (200 proof). Since different people will be using different alcohol sources, it isn't possible for me to include all possible calculations. If we want to make one litre of menstruum at 33% alcohol, we need to use as much of our particular alcohol source as is necessary to provide 330 ml of pure alcohol (which is 33% of 1,000 ml or 330 ml). Using your example, if our alcohol source is 80 proof, which is 40%, we need to calculate how much 40% alcohol is necessary to provide 330 ml of pure alcohol. This is basically an algebra question. We need to divide 330 (the amount of pure alcohol that we need) by the percentage of alcohol of our alcohol source which is 40/100 or 0.4. Therefore, to calculate the amount of our 80 proof (40%) alcohol source that we need to provide 330 ml of pure alcohol we divide 330 by 0.4 and we get:

    330/0.4 = 825

    So, to make a menstruum that is 56% water, 33% alcohol and 11% glycerin using an 80 proof (40%) alcohol source, we need to use 825 ml of our alcohol source, 110 ml of pure glycerin and 65 ml of water. You can use this calculation for any alcohol source, just remember that percentages are actually fractions. 40% means 40/100 which is 0.4. Always divide the amount of pure alcohol that you need in the volume of menstruum that you are making by the percentage of alcohol of your alcohol source as a decimal (i.e. 0.4 for 40%, 0.5 for 50%, etc.).

  4. Michael,

    I have made several tinctures using your menstruum formula. It made the most sense to me after much internet research.

    Question: What is the typical shelf life of a tincture with this formula as glycerin is more perishable? Does the alcohol preserve the glycerin as well?

    1. 30% alcohol is enough to preserve the tincture including the glycerin content. As long as the tincture is properly sealed it will preserve indefinitely. The only concern is how long it maintains its potency. As I indicated above, if we are conscientious about how we prepare and store the maceration, for most herbs it will maintain its potency for many years. The major drop in potency occurs after we press it. I will provide more on that in Part 4. I lost track of this one, but it is my intention to post Part 4 in the next few weeks.

  5. Alcoholism is a medical condition and there is no such thing as "former alcoholics" , being these posts relative to "medicine making" you should get informed about that. It does sound like you are disregarding this "minority" which is not such by the way. You should be writing for humanity as a whole when talking about health. There are other ways to make a point over alcohol vs glycerine than pointing out a group of people or making comments as "the vast majority" implying superiority. Your posts where great until you talked about something you don t know about now you started sounding pretentious.

    1. I here that this is a sensitive issue for you and some people might take offence to the term "former alcoholics". I have changed the wording to "people who have a history of alcoholism".

      That being said, we could view anything as a "medical condition". There are degrees of healing and what I am primarily looking for in my practice and speaking to when I write about healing is very deep healing as opposed to surface or symptomatic healing. There is an overwhelming tendency within the medical model to only look at and address the surface of things. Alcoholism is no exception. There is no doubt that the mantra "once an alcoholic, always an alcoholic" has helped a lot of people to abstain from drinking alcohol when doing so could lead them back into an unhealthy relationship with alcohol. However, from a healing perspective it is necessary to get to the roots of a person's alcoholism — or any addiction for that matter. At the root of addictions are deep emotional and spiritual challenges. The addiction is just the tip of the iceberg. Deep healing occurs when a person is ready and able to access and move through the deeper challenges that lead them to addiction. I know that from experience because I have worked with people with many forms of addiction and have witnessed it. When a person achieves that kind of depth of healing they may choose not to drink alcohol (for those for whom alcohol was their addiction) because there is no reason to drink alcohol, but it is not because they are afraid they might fall back into an unhealthy relationship with alcohol. For them there is no issue with using herbs in the form of tinctures.

      Nevertheless, as with any health challenges, everyone's situation is different. We might not be ready to go that deep — or realize that it is even a possibility — or have the necessary support to help us engage with it. To heal something like an addiction is going to require the support of a lot more than an herbalist.

      This series is about making tinctures, which in my experience for reasons that I have indicated are usually the best way to use herbs — but not the only way. There are other forms that are very effective and for various reasons might be preferable for some people.

  6. Where do you get your amber bottles from?

  7. The best sources will depend on where you live. As a general rule, I do not like to promote specific companies. If you do a search of the names of the jars and bottles that I mentioned in this post you should be able to find suppliers.

  8. Hi Michael, what is your opinion on using powdered herbs as opposed to fresh / dried herbs for tinctures? Thank you.

  9. I totally agree with you .But my concerns are about those plants which contain toxic compounds. You want to extract the active compounds leaving behind the toxic compound as wormwood nauclea latifolia if the toxic compound is alcohol soluble. my thinking is that best extract in water in vegetable glycerine and then use alcohol as preservative .knowing that adding 40 % alcohol will act as good preservative use the alcohol at that %. What do think about this ? Thanks