Milk Thistle
Silybum marianum (Silymarin)
The go-to liver support herb, with strong evidence for protecting liver cells and supporting liver function.
Milk thistle contains silymarin, a group of flavonoids with potent hepatoprotective properties. It's one of the most well-researched herbal supplements for liver health, used clinically in Europe for liver conditions. Protects liver cells from toxins, supports regeneration, and has antioxidant effects. Commonly used for general liver support and after alcohol consumption.
Mechanisms of Action
Liver Cell Protection
Stabilizes liver cell membranes against toxins
Liver Regeneration
Supports liver cell renewal
Antioxidant Activity
Reduces oxidative stress in the liver
Recommended Dose
200-400mg silymarin (standardized extract)
Optimal Timing
- With meals
- Split into 2-3 doses
Take with food
Best Form
Standardized extract (70-80% silymarin)
Alternatives: Siliphos (phosphatidylcholine complex), Silybin phytosome
Standard silymarin has poor bioavailability. Phytosome/Siliphos forms are better absorbed but more expensive.
Duration
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Taking with food improves absorption. Phosphatidylcholine-bound forms (Siliphos) may have better bioavailability.
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Liver Protection
Protects against various liver stressors
Improved Liver Enzymes
May normalize elevated liver enzymes
Antioxidant Boost
Increases liver glutathione
Traditionally used but limited safety data; consult doctor
Often used clinically but should be under medical supervision
Who Should NOT Take This
- Allergy to plants in Asteraceae family (ragweed, daisies)
Drug Interactions
May affect metabolism of some drugs; consult pharmacist
May have additive blood sugar lowering
May affect metabolism
Possible Side Effects
Tip: Take with food
Tip: Reduce dose
Tip: Discontinue if rash occurs
Warnings
- Not a cure for liver disease ā supports liver health
- Severe liver conditions require medical treatment
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Top studies from 40+ peer-reviewed papers
Miao R et al. ā¢ Phytotherapy research : PTR (2025)
āHowever, further validation of these findings is necessary through extensive clinical studies with larger sample sizes.Ā© 2025 John Wiley & Sons Ltd.ā
Key Findings:
- For HbA1c, silymarin was more effective than resveratrol (MD -2.08, 95%Cl -3.50 to -0.72) (P <ā0.05).
- For body mass index (BMI), curcumin was more effective than resveratrol (MD -1.27, 95%Cl -2.43 to -0.03) (P <ā0.05).
- Curcumin, resveratrol, silymarin, and berberine can effectively improve cardio-metabolic risk factors in T2DM, and different herbal phytochemicals have different clinical advantages.
- However, further validation of these findings is necessary through extensive clinical studies with larger sample sizes.Ā© 2025 John Wiley & Sons Ltd.
Liu H et al. ā¢ Phytotherapy research : PTR (2024)
āThis study may help guide clinicians and lead to further detailed studies.Ā© 2024 John Wiley & Sons Ltd.ā
Key Findings:
- The results of the network meta-analysis showed that artichoke leaf extract confers a relative advantage in reducing the aspartate aminotransferase (AST) levels (SUCRA: 99.1%), alanine aminotransferase (ALT) levels (SUCRA: 88.2%) and low-density lipoprotein cholesterol (LDL-C) levels (SUCRA: 88.9%).
- Naringenin conferred an advantage in reducing triglyceride (TG) levels (SUCRA: 97.3%), total cholesterol (TC) levels (SUCRA: 73.9%), and improving high-density lipoprotein cholesterol (HDL-C) levels (SUCRA: 74.9%).
- High-density catechins significantly reduced body mass index (BMI) levels (SUCRA: 98.5%) compared with the placebo.
Shahsavari K et al. ā¢ BMC complementary medicine and therapies (2025)
āThis meta-analysis examined the effects of Milk Thistle.ā
Key Findings:
- According to the findings of this meta-analysis silymarin administration showed a significant reduction in AST (SMD [95% CI]: -ā0.670 [- 0.931, -ā0.408], p-value =ā0.000), and ALT (SMD [95% CI]: -ā0.912 [- 1.177, -ā0.646], p-value =ā0.000) levels.
- While it had no statistically significant effect on ALP level (SMD [95% CI]: -ā0.236 [- 1.929, 1.458], p-value =ā0.159).
- The subgroup analysis was also showed significant decrease in AST and ALT levels for patients with BMI less than 30, while silymarin treatment had no significant effects on AST and ALT levels in patients with BMI ā„ā30.
- AST and ALT levels significantly decreased in patients with NAFLD and viral hepatitis, while it had no significant hepatoprotective effects in patients with drugs induced liver injury and alcohol-related liver disease.
Li S et al. ā¢ Annals of hepatology (2024)
āSilymarin can regulate energy metabolism, attenuate liver damage, and improve liver histology in NAFLD patients.ā
Key Findings:
- In addition, silymarin attenuated liver injury as indicated by the decreased levels of ALT (SMD[95%CI]=-12.39[-19.69, -5.08]) and AST (SMD[95% CI]=-10.97[-15.51, -6.43]).
- The levels of fatty liver index (SMD[95%CI]=-6.64[-10.59, -2.69]) and fatty liver score (SMD[95%CI]=-0.51[-0.69, -0.33]) were also decreased.
- Liver histology of the intervention group revealed significantly improved hepatic steatosis (OR[95%CI]=3.25[1.80, 5.87]).
Ranneh Y et al. ā¢ Nutrients (2024)
āStill, the inconsistent results across the included RCTs require further clinical research to establish optimal dosage and duration.ā
Key Findings:
- Most studies on silymarin showed a reduction in liver enzymes and lipid profile; however, no changes were observed in inflammatory cytokine levels.
- The dietary supplementation of hesperidin and naringenin or green tea extract caused improvements in liver enzyme, lipid profile, and inflammatory cytokine, while genistein supplementation did not modulate blood lipid profile.
- In conclusion, dietary supplementation of polyphenols could potentially prevent and ameliorate NAFLD.
- Still, the inconsistent results across the included RCTs require further clinical research to establish optimal dosage and duration.
Study Type Distribution
Goals This Supplement Supports
Related Goals
This information is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider before starting any supplement.