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Thistle extract was tied to a large drop in a liver enzyme in a meta-analysis of 221 patients — but all had alcoholic liver disease and the dose used wasn't reported.
The result is promising for a specific clinical population, but with only 6 small studies and a moderate strength of evidence, it's far from a general recommendation for healthy people.
A meta-analysis found that silibinin (from thistle) significantly reduced ALT, a marker of liver stress, in people with alcoholic liver disease. However, the analysis pooled just 221 patients from six studies, the dose was not specified, and mild side effects like stomach upset and insomnia were reported.
Where this fits in the evidence
Pillser has synthesized 6 studies on Thistle for Reduced Alanine Aminotransferase Level — overall evidence strength: Moderate.
Across 6 studies, 4 reported beneficial effects of thistle (silymarin/silibinin) on reducing alanine aminotransferase (ALT) levels, with effect sizes ranging from small to large, and 2 found neutral results. The two highest-quality meta-analyses (evidence scores of 7) both showed statistically significant beneficial effects — one in NAFLD patients (moderate effect, SMD -0.47 to -0.88) and one in patients on anti-TB drugs (small effect, SMD -0.15). The median study duration across the 2 studies that reported it was 104 days (approximately 15 weeks), indicating effects are typically observed after several weeks of supplementation.
The study
- Systematic Review
- n = 221
- 2025-02-04
- Frontiers in pharmacology
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.