With small scale 'on-the farm' production, the hydrosols can become contaminated by the atmosphere or by the unhygienic conditions in which many stills are located. It is common to see barrels being filled in the open air that previously were stored over filthy drainage channels or in dirty barns.
With essential oils contamination is unlikely to be a problem due to their general inability to support most bacterial or fungal growth. However, with distillation waters this is another matter as hydrosols make an ideal growth medium for bacteria and fungi.
Subsequent bottling can turn a contaminated hydrosol into a safe one. For example they can be pasteurised in the same way as drinks or milk, or they can be finely filtered to remove organisms and other contaminants. This is all fine if the hydrosol is kept in a sealed bottle, but once opened they can quickly become contaminated again and the greatest care must be taken to avoid this. To prevent this contamination causing a health problem, larger commercial suppliers will add a preservative. The preservatives are often the same as those commonly used in foods. This idea goes against those who say they "must have a 100% natural product", but in reality, many hydrosols do contain a preservative without it being declared. Thank goodness they do as 'natural' does not equal safe.
There are other methods used to produce what is called a hydrosol or distillation water, but which are not genuine. They can be home-produced simply by making an infusion of the herb, filtering it and selling it as a hydrosol. They can be produced from freeze dried herbal extracts reconstituted with water (common). This may even be done in the country of origin making detection difficult. They can be made by dissolving some essential oil in water by using a surfactant to permit the oils emulsification. Finally, in some cases, they can be a synthetic perfume compound added to water. This is not uncommon with rosewater sold in pharmacies, or beauty shops.
November 2008 update: To confirm the above, I have just seen a copy of microbial testing done by a professional lab on Sandalwood hydrosol. Extracts of that report are reproduced here courtesy of Butch Owen of http://www.av-at.com He has his hydrosols tested every 90 days and always tests what bulk suppliers are offering to him.
The results of those tests are horrifying, the Sandalwood hydrosol that was being offered had a total plate count of 22,000,000, compared to a total for Lavender USA of just 10, Turkish rose 4 and US Melissa 1.
State standard for bottled drinking water is a plate count of bacteria
no higher than 500 parts per million in a 100 ml test sample.
What the bugs were in the Sandalwood is not known, but it proved how badly contaminated some hydrosols can be. It also shows how those who advocate the internal use of hydrosols that have not been tested for contamination are playing with fire, and how easily a disease epidemic could be triggered by a trade that claims to aid peoples health.
For those who wish to check the hazards associated with bottled waters below is some essential reading.
The above reports contain information on the contamination that has been found in ordinary bottled waters. In one survey of 103 brands up to a third of samples were contaminated. Cryptosporidium, Giardia and other cysts have been found and these led to 4000 people being hospitalised. Dateline NBC, September, 1994. The NRDC'S study of water found many different kinds of bacteria capable of causing illness.
You may be thinking "what has this got to do with hydrosols"? Well most hydrosols are mainly water with minute traces of a variety of plant chemicals. Rarely are those plant chemicals occurring at a high enough level to inhibit bacterial or fungal growth, despite the hype you will see written on this.
There is only one hydrosol that I have seen to date which I would be concerned about in this respect and that is Calamus. This herb has many question marks over its potential carcinogenicity, therefore I would not advocate its use. I would also suspect that anyone who does advocate its use has had no formal training in modern herbal medicine or safety issues. Beware of aromatherapy type authors on these issues!
I would strongly advise any aromatherapist to check their insurance position on this. Many aromatherapy policies do not permit the therapist to practice herbal medicine. If you advise someone in a professional setting to consume a hydrosol for a medical reason, then you are practising as a herbalist. In some countries that would also classify you as an "unlicensed medical practitioner".
The only way you can hope to find out is to ask the supplier pertinent questions (as follows), and do not believe woolly or misleading marketing hype.
1. Does this hydrosol contain a preservative? If the answer is a categorical "no" then see next.
2. Do you have any evidence that this product has been tested for microbial contamination?
3. Can I see copies of test results?
4. Where is the product bottled, i.e. by the distiller or later in the supply chain?
5. Do you repack the hydrosol from bulk barrels or other bulk storage?
6. Do you produce it yourself? If so how is it stored and how do you ensure it is not contaminated?
7. If you advocate its consumption have you been certified as a food preparation premises?
Some hydrosols can be very useful for a limited range of ailments. For example, rose, chamomile, lavender, neroli, and a few others can make wonderfully cooling applications for a variety of skin problems. Indeed in some cases they are better than the same plants essential oil. However, unlike with essential oils, there is hardly any research base behind such uses. It is mainly traditional information and how accurate that information is depends on the depth of knowledge of the person advocating its use. Herbalists in the past rarely used hydrosols because they preferred to use herbal teas or decoctions which (when freshly prepared) were not contaminated by microbes. Therefore, there is very little information to be found on hydrosols in good books on herbal medicine. When in certain societies they did use hydrosols, you should always remember they used the fresh product. They did not use it from a bottle that had been shipped round the world with the time and conditions suitable for microbial growth (unless a preservative is used).
Beware of hydrosols made from plants on which there is no safety data on their essential oils. For example, verbenone type rosemary, ravensara, thyme chemotypes, etc. Also beware of hydrosols made from plants with known dangers, for example the sensitisation reactions associated with fresh Verbena and Yarrow. These hydrosols may be safe on the skin but I am not aware of any formal testing having been done.
Traditional healers rarely used hydrosols because they did not generally undertake distillation, although there are a few exceptions. So one has to ask where all this information entering the market in recent years has come from? The simple answer is a typical one for aromatherapy: The suggested uses are frequently based on how teas and suchlike were and still are used by herbalists. Also, in many cases, the uses have simply been invented by certain aromatherapy authors.
I have to add something very important here. Please never forget that very few aromatherapists are trained in physical diagnosis, in the medical sciences or in herbal medicine. Therefore, the aromatherapists advocating the use of hydrosols can make some enormous blunders on what they write about and teach. Some of the claims on web sites are outrageously misleading and are often illegal under their countries own laws. Canada is particularly bad in this respect.
Beware of those who make references to uses based on the books of certain French aromatherapy authors. With one book in particular, the information is not properly referenced and it is known some of the text was not written by the claimed authors, but rather by editors. Therefore, medicinal claims made in such a book should be viewed with the utmost scepticism. One web site in Canada is using information from this book and the site owner is being promoted as "a world leader on the subject", in reality far from the truth.
Never accept the following statements without any evidence of their truthfulness. What follows and other answers are just hype and lies designed to mislead.
" I have been selling this for 20 years and never had a problem".
"I am a leading authority on the use of hydrosols",
"such and such teacher says",
"I am working with 4 chemists around the world",
flower remedies use alcohol as a preservative"
a little grain alcohol acts as a preservative".
Yes, they can be if they are properly treated to ensure no contamination. They can be very good for treating most kinds of skin inflammation. Rosewater in particular is wonderful for that. They can be excellent cosmetic agents for treating things like overactive sebum production. Some can be great for subduing the inflammation of acne and similar conditions. Some are the ideal solution to sore eyes or minor convunctival infections. They can be an ideal cooling application for nipple soreness from early breastfeeding, as they can for soothing external vaginal damage from childbirth. There are many other examples involving damaged skin that they are ideal for, but only if the product can be proven to be bug free.
I drink them? No
I would not. See update above on the risks
you are running. If I wanted a herbal preparation I would rather
make a fresh herbal tea which contains far more of the herbs active constituents
than most hydrosols.
I would advise anyone who wants to take a training course in the use of hydrosols to be most cautious about the qualifications declared by the teacher. As I said above, few if any aromatherapists or authors on this subject have had any formal training in herbal medicine. Also of the few that claim they have, the quality of their own training is open to debate. If the advocated uses are just cosmetic there is less of a problem. However, if the suggested uses are medical in nature then this is a very dangerous minefield to enter, and without training in herbal medicine such treatments in unskilled hands amount to quackery.
Source and copyright: