Milk thistle (Silybum marianum) contains silymarin, traditionally used for liver health. Milk thistle benefits have mixed evidence — some studies promising, others negative. Often used as adjunct in liver conditions.
Evidence for liver conditions
Fatty liver disease (NAFLD): Some evidence for liver enzyme reduction. Modest effect.
Cirrhosis: Mixed evidence; some studies show modest mortality reduction.
Drug-induced liver injury: Some evidence.
Hepatitis C: Negative trials for outcomes despite some lab improvements.
Mushroom poisoning
IV silibinin (active component) is used for amanita mushroom poisoning. Specific medical use.
Other uses (limited evidence)
- Diabetes (some glucose effects)
- Skin conditions
- Cholesterol
Dosing
- 140-450 mg silymarin daily (typical formulations)
- Standardized to 70-80% silymarin
- Take with food for absorption
Safety
Generally well-tolerated. Possible:
- GI upset
- Allergic reactions in those allergic to ragweed family
- Some drug interactions (CYP enzyme effects)
Frequently Asked Questions
Does milk thistle protect liver from alcohol?
Limited evidence. Don’t rely on supplements; reduce alcohol.
Should I take milk thistle for fatty liver?
May be reasonable. Lifestyle modification more impactful.
Can I take milk thistle with medications?
Some interactions possible. Discuss with provider.
Is milk thistle safe long-term?
Generally yes based on available evidence.
What’s the active ingredient?
Silymarin (mixture of flavonolignans). Silibinin is the most potent component.
The bottom line on milk thistle
Some evidence for liver conditions. Modest effects if any. Lifestyle modifications more impactful for liver health.