From Mountain Rose Herbs:
Also known as

Silybum marianum, Holy Thistle, Variegated Thistle, Lady's Thistle.


Milk thistle is a member of the sunflower family native to a narrow area of the Mediterranean, but grown for centuries throughout Europe and and now a common weed in California. Milk thistle was probably brought to North America as a coffee substitute, but its shiny black seeds covered with feathery tufts have a far longer history in

herbal medicine.

The edible thistles were given the name silybum by Dioscorides, a Greek physician who served in the Roman Army over 1,900 years ago. The thistle with white mottling on its leaves became known as the "milk" thistle. This herb served as a therapy for conditions we would now recognize as ascites, congestive heart failure, various kidney diseases, and hepatitis.

In Catholic Germany, its usefulness was said to be second only to calling on Mother Mary, and the white mottling on the leaf said to be the touch of the Virgin Mary's milk, hence the species name "marianum."

In the twentieth century, German physicians and pharmacologists found that milk thistle could treat certain mushroom poisoning, fatty liver due to alcoholism, cirrhosis, and hepatitis B and C. Much of the research involved a proprietary formula developed by the German natural products maker Madaus, but the authoritative Complete
German Commission E Monographs also recognized the usefulness of the whole herb.


Silymarin (silibinin, silydianin, and silychristin), vitamin E (tocopherols), and about 90% fatty acids.

Parts Used

The threshed, dried seed.

Typical Preparations

Whole seeds or seed powder, encapsulated or used to make an infusion. The most convenient form has been either an alcohol or glycerin extract.


There is a tendency among herbalists to think of milk thistle seed and silymarin as synonymous. For instance, The Expanded German Commission E Monographs notes the historical uses of the whole herb for treating "Congestion of the liver, spleen, and kidneys" and in the very next paragraph states, "Milk thistle is an example of a preparation that is required to be in the standardized, concentrated form in order to fully convey the desired, in this case, hepatoprotectant, effects." This isn't necessarily so.

There's no doubt that silymarin extract delivers more silymarin than the same amount of milk thistle. This is because only about 10% of the silymarin in the seed can be absorbed by the digestive tract, and the seed is only up to 3% silymarin. However, since the customary dose of the whole herb is 12 to 15 grams (up to 3% silymarin)
and the customary daily dose of silymarin extract amounts to 200 to 400 milligrams of silymarin, you actually get an effective dose of silymarin by taking whole milk thistle seed three times a day.

There are other reasons to use the milk thistle seed (whole or ground) rather than silymarin extract. Even when an herb is used to treat a serious health condition, the whole herb often has a more balanced effect. The milk
thistle extract silymarin, for instance, has proven usefulness in treating liver disease. The drawback to using silymarin is that, if the doctor prescribes other drugs, such as steroids, silymarin can interfere with the liver's ability to detoxify them. Milk thistle seed has the same healing effect on the liver without interfering with the organ's ability to detoxify drugs or environmental chemicals, and a side benefit of normalizing blood lipids as the liver heals.


Like silymarin extract, milk thistle seed can cause mild diarrhea by stimulating the release of bile. This effect is most notable if there is a high-fat diet.

Milk thistle is most properly thought of as a liver protector. It functions best when taken before the liver encounters alcohol, chemicals, poisons, or other stressors. Those with chemical sensitivities find it helpful to take a large dose of milk thistle seed tincture before venturing into difficult environments.

Views: 3622

Comment by Yvonne Robinson on January 10, 2011 at 7:41pm

Pat, besides Milk Thistle what can you recommend for Hepatitis C ?



Comment by sunshinestarr on January 15, 2011 at 12:37pm
I'm very interested in this as well.  We just found out that my dh has some liver problems, (related to his Celiac disease) and I'm very concerned.  Will find some milk thistle for him.
Comment by Steve Kraisinger on January 16, 2011 at 8:17am

I think that is true of all herbs, God made them for us to consume in there full form , not an isolated part..

The whole Herb is better, I put Milk Thistle in my smoothie everyday from fresh ground seeds!


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