Milk Thistle
(Silybum marianum)
Also know as St. Mary's thistle
Botanical Information
A tall stout, spiny thistle with bright purple flowering heads. The glossy leaves are covered with wavy milky bands, thus the name milk thistle. An Aster family member.
Working with Milk Thistle
Part(s) Used
Seeds
Herb Forms
Tincture, standardized extract in tablets, bulk seed
Christopher Hobbs:
“Known for its excellent liver-protectant properties, milk thistle has proven effective in scientific studies for hepatitis, cirrhosis, and jaundice. This herb is used to protect the liver from toxins and drugs, such as alcohol, aspirin, acetaminophen, and pharmaceutical drugs. It enhances liver regeneration after exposure to heavy metals, radiation, or toxic chemicals. Milk thistle stimulates the growth of new liver cells, builds liver health, and is a strong antioxidant.
The ground seeds can be sprinkled on food; besides the liver-protective compounds (called silymarin), they also contain a substantial quantity of essential fatty acids, starch, and protein. The young greens are among the tastiest of all wild foods, after the spiny leaf margins are removed with a scissors.
Milk Thistle has a taste of BITTER, SWEET and a temperature of COOL.”
Milk thistle is an herb with a long history of medicinal use, primarily for liver-related ailments. Historically, it has been used in traditional medicine for liver and gallbladder disorders, detoxification, and support of liver function. Its active ingredient, silymarin (a complex of flavonolignans), has antioxidant, anti-inflammatory, and hepatoprotective properties.
Modern Clinical Uses
In modern herbal and naturopathic medicine, milk thistle is commonly used for liver support, especially in cases of liver disease, fatty liver, cirrhosis, hepatitis, and drug or alcohol-induced liver damage. It is also sometimes used to manage symptoms of dyspepsia and to support kidney health.
Chemistry and Pharmacology
Silymarin, primarily composed of silybin, is the key active component. It acts as an antioxidant by scavenging free radicals, promotes protein synthesis, and may stabilize cell membranes, thereby protecting liver cells from toxins. Silymarin’s bioavailability is variable, and research into increasing absorption (through formulations like silymarin-phosphatidylcholine complexes) is ongoing.
Clinical Trials and Evidence
Several clinical trials have investigated milk thistle’s efficacy in liver disease, with mixed results. While some studies show promise in reducing liver enzyme levels and improving liver function markers, evidence on its effectiveness in conditions like hepatitis and cirrhosis is inconclusive. Further, higher-quality trials are necessary to establish clear clinical guidelines.
Summary
Milk thistle is a popular herbal supplement with potential benefits for liver health. Although its pharmacological properties support its traditional uses, more research is needed to confirm its effectiveness across a range of liver conditions and establish standardized therapeutic dosages.
Generated by ChatGPT; edited by Christopher Hobbs
Cautions
Milk thistle is generally considered safe with few reported side effects, most of which are mild (e.g., gastrointestinal upset). It’s usually recommended at 200-400 mg of standardized silymarin extract per day, but dosage may vary based on the condition being treated. High doses are not associated with toxicity but should be used cautiously in pregnancy and people with allergies to Asteraceae plants.
Contraindicated for people with liver cancer, and other cancers because of its cell-proliferant qualities.
Conditions treated with Milk Thistle
Condition
Treatment Support
Application
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Condition
Treatment Support
liver protector, rebuilder
Application
standardized extract, tincture
Condition
Treatment Support
liver tonic and protectant
Application
tincture, tablet
Condition
Treatment Support
liver tonic and protectant
Application
tincture, tablet
Condition
Treatment Support
liver and spleen protectant
Application
tincture, tablet
Dosages
Powdered Extract
200-400 mg daily
Tincture
1 dropperful 2-4 times daily
Capsules
follow label instructions
The information given here is designed to help you make informed choices about your health. The information is drawn from numerous sources—both traditional medicine practice, from the clinical experience of many herbalists currently practicing, and supported by decades of scientific research from the author. The research most consulted includes human clinical trials that help to determine the most effective and safe herbs for various needs, the best doses, and types of preparations.
The information offered in this database is not intended as a substitute for any that may have been prescribed by your health practitioner or physician.