My brother in law has milking cows aged up to 23 years and still produceing milk. Around his Organic Dairy Farm he has hedges of Comfrey which the cows devour daily.
Healthiest cows I have ever seen!
Another friend feeds his pigs Comfrey and on slaugter they had the healthiest of livers.
There are numerous studies now available that show the benefits of using comfrey leaf (S. officinale) as an animal food supplement. This is especially true for older plants, where the leaf is taken prior to the "10-percent" flowering stage, much like alfalfa. While the root is quite high in PAs, there are absolutely no PAs shown to exist when 3-year-old comfrey leaf is cut at this stage of growth.
All reported toxic reactions in humans (only 4!) are from individuals who took massive doses of leaf , either by juicing it, or large quantities of tablets. However, when used as a 50-percent supplement to cattle, not only are there no reported toxic reactions, apparently it is metabolized into harmless proteins, including two essential amino acids missing in alfalfa (lysine and alanine). When combined with alfalfa, this mixture becomes a "whole food" for the cow! Allantoin is also considered very important to cattle, especially those in feed lots where chance of disease and infection is so much higher.
While debate continues on the safety of comfrey, current evidence indicates that commercial comfrey preparations are not always derived from S. officinale. Uncertainties in the marketplace are compounded by errors in the scientific literature, further complicating safety evaluation. The presence of echimidine (likely the most toxic alkaloid) in commercial products has led the Canadian government to propose a general ban on comfrey. In the U.S. the American Herbal Products Association and the FDA are both reviewing the literature on comfrey to determine what action may be appropriate regarding marketing of comfrey products.
a well covered subject. anyone4 studying the dr john r. christopher knows thisa subject well.
if your a drug addict and destroyed your liver, then avoid comfrey and all herbs for matter.
dr. christopher made the liver/gallbladder cleanse formula for the drug addicts and then started them on comfrey formulas.
comfrey is a 100% legal herb sold commercially in the u.s.a.
pregnant women develope wonderful babies when they consume comfrey every day. babies develope wonderfully when they consume a little comfrey every day....david christopher states that comfrey never has been a problem, no know cases it ever caused any problems.....but a drug addict with a near dead liver may not do well on "fresh" raw comfrey roots picked in the spring....all commercial comfrey is usually dried powder and the dried powder is a great source of plant calcium and plant calcium one supplement humans do very well on.
simple rule of thumb
"if" your in doubt about an herb or drug or a vitamin, then don't take it! personally i haven't taken an over the counter vitamin for 30 years nor asperin, etc....because those things really are toxic.
comfrey is one of the top 5 herbs for human health on earth.