Milk Thistle

Also known as: silymarin, silybum marianum, silybinin

Grade B — Moderate Evidencebotanicalliverdetox
200–600 mg silymarinWith meals, split 2-3 times daily

Milk thistle (Silybum marianum) contains silymarin, a complex of flavonolignans (primarily silybin) that provides hepatoprotective effects through antioxidant activity, membrane stabilization, and stimulation of liver cell regeneration. It is the most studied herbal supplement for liver support, with clinical evidence for improving liver enzymes in fatty liver disease, supporting recovery from hepatitis, and reducing liver damage from toxic exposures. Standardized extracts (70-80% silymarin) are recommended.

TL;DR: Premier liver-support herb with strong evidence for hepatoprotection. Silymarin (active compound) has antioxidant, anti-inflammatory, and regenerative effects on liver cells. Phytosome form preferred.

🧬Longevity🦠Gut Health
Last reviewed: 2026-03-12

Quick Facts

Evidence

Grade B

Studies

2

Interactions

2

Forms

1

Evidence Rating: Grade B — Moderate Evidence

Some RCTs with positive results, or strong observational evidence. More research may refine our understanding.

Interaction Warnings

CYP3A4 substratesModerate

May inhibit CYP3A4 — could increase levels of many medications including statins, some HIV drugs.

Diabetes medicationsLow

May have mild glucose-lowering effect — monitor blood sugar.

Important Notes

  • Standardized to 70-80% silymarin content
  • Phytosome/phospholipid complex forms have better absorption
  • Generally very well-tolerated — mild GI upset possible

Clinical Evidence (2 studies)

Silymarin for liver disease: systematic review

Saller R et al. (2008) — Forsch Komplementmed

Silymarin demonstrates hepatoprotective effects including antioxidant, anti-inflammatory, and antifibrotic properties in liver disease

View on PubMed

Silymarin in NAFLD: randomized controlled trial

Solhi H et al. (2014) — J Res Med Sci

Silymarin 560mg/day for 8 weeks significantly reduced ALT and AST liver enzymes in NAFLD patients

View on PubMed

Alternatives to Consider

These supplements target similar goals and may be worth considering alongside or instead of Milk Thistle.

Sulforaphane

Grade B

Powerful Nrf2 activator from cruciferous vegetables. Evidence for air pollution detoxification and H. pylori eradication.

🧬 Longevity🦠 Gut Health

Chlorella

Grade C

Green algae rich in chlorophyll, protein, iron, and B12. Evidence for immune support and metabolic markers. Broken-cell wall form required for bioavailability. Complementary to spirulina.

🦠 Gut Health🧬 Longevity

Phosphatidylcholine

Grade B

Dietary choline source for acetylcholine synthesis and liver health. Sunflower lecithin is soy-free alternative.

🦠 Gut Health

Related Supplements

Sulforaphane

Grade B — Moderate Evidence

Powerful Nrf2 activator from cruciferous vegetables. Evidence for air pollution detoxification and H. pylori eradication.

Chlorella

Grade C — Preliminary

Green algae rich in chlorophyll, protein, iron, and B12. Evidence for immune support and metabolic markers. Broken-cell wall form required for bioavailability. Complementary to spirulina.

NAC (N-Acetyl Cysteine)

Grade B — Moderate Evidence

Precursor to glutathione (master antioxidant). Strong evidence for respiratory health, liver support, and psychiatric conditions.

Berberine

Grade A — Strong Evidence

Potent plant alkaloid with metformin-like effects on blood sugar. Also activates AMPK (longevity pathway). Multiple drug interactions.

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⚕️ Important Disclaimer

This information is for educational purposes only. It is not medical advice. Always consult a healthcare provider before starting any supplement regimen, especially if you take medications or have health conditions.

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