Milk thistle

Milk thistle is a thorny plant with distinctive white-veined leaves. Its seeds contain silymarin—a complex of flavolignans (silibinin/silybin, silychristin, silydianin) that protect liver cells by stabilising cell membranes, acting as antioxidants, and promoting liver cell regeneration.

Used in European medicine for over 2,000 years for liver and gallbladder conditions. Pliny the Elder described mixing its juice with honey for bile conditions. Used throughout medieval European herbalism as a liver tonic.

Multiple RCTs and meta-analyses demonstrate liver-protective effects in alcoholic liver disease, non-alcoholic fatty liver disease (NAFLD), and drug-induced liver toxicity. Intravenous silibinin is an approved emergency treatment for Amanita mushroom poisoning in Europe. Some evidence for improved liver enzymes in hepatitis C. Anti-inflammatory and antioxidant effects well-established.

Standard dose: 140mg silymarin 3 times daily (420mg/day total silymarin). Must be from standardised extract (70–80% silymarin). For enhanced bioavailability use phosphatidylcholine-bound form. Take with food. Minimum 3-month course for meaningful liver benefit. Tea is not effective for liver protection.

Very safe with long-term use demonstrated in clinical trials. Mild laxative effect at high doses. Rare allergic reactions in ragweed-sensitive individuals. May slightly lower blood sugar. May affect the metabolism of some drugs via CYP enzyme inhibition—check with your pharmacist if on medications.