Milk Thistle (Silymarin)
Botanical
Also known as: Silybum marianum, Silymarin, Silybin, Milk Thistle Extract (Silybum marianum), Milk Thistle Seed Extract
A
Grade A💊 200-400mg standardized extract 2-3x daily🎯 8 primary uses🔗 4 synergies⚠️ Review warnings
Levels upHeart & Longevity+50 pts
Overview
Milk thistle extract contains silymarin, a flavonoid complex traditionally used to support liver health and function. Clinical evidence suggests modest benefits for liver support, though results remain mixed across studies.
Primary Uses
Liver protectionLiver regenerationToxin exposureAlcohol supportLiver health supportHepatic functionAntioxidant supportLiver detoxification
Frequently Asked About Milk Thistle (Silymarin)
How much Milk Thistle (Silymarin) should I take?
The typical effective range is 420-600 mg silymarin/day. Individual needs vary based on age, body weight, diet, and goals — start at the lower end and adjust based on response. Always consult a healthcare provider before starting a new supplement.
When is the best time to take Milk Thistle (Silymarin)?
With meals. Consistency matters more than perfect timing — pick a daily anchor (e.g. with breakfast or before bed) and stick with it.
Should I take Milk Thistle (Silymarin) with food?
Yes, enhances absorption.
Does Milk Thistle (Silymarin) interact with medications?
Yes — known interactions include May affect CYP450 metabolism, Diabetes medications (may enhance), and Statins (may affect levels). If you take any prescription medication, talk to your doctor or pharmacist before starting Milk Thistle (Silymarin).
What does Milk Thistle (Silymarin) pair well with?
Milk Thistle (Silymarin) stacks well with NAC, Artichoke extract, and Dandelion — these combinations either improve absorption or work synergistically toward common goals.
Who should not take Milk Thistle (Silymarin)?
Milk Thistle (Silymarin) should be avoided or used with caution by people with Ragweed/daisy allergy. Pregnant or breastfeeding women should consult a healthcare provider before use.
What are the side effects of Milk Thistle (Silymarin)?
Most people tolerate Milk Thistle (Silymarin) well. The most commonly reported side effects are Rare: mild GI upset and Allergic reactions (ragweed family). Side effects are usually dose-dependent — lowering the dose often resolves them.
Dosage
Typical range
200-400mg standardized extract 2-3x daily
Timing
With meals
With food
Yes, enhances absorption
Dose Tiers
Moderate
200-400 mg silymarin
Optimal
420-600 mg silymarin/day
Therapeutic
600-1,200 mg silymarin/day
Upper Limit
No established UL
Duration
Long-term use safe and appropriate
Special Populations
Those with liver concerns, alcohol users, medication users
Research & Studies
Landmark clinical studies on Milk Thistle (Silymarin). Each title links to a plain-English breakdown — what the study shows, what its limitations are, and how to read around them.
- Silymarin for the treatment of acute clinical hepatitis: a meta-analysis of randomized controlled trialsRambaldi A, Jacobs BP, Gluud C · 2007 · Cochrane Database of Systematic ReviewsMeta-analysis
Cochrane meta-analysis of 18 RCTs (n=1,088) in alcoholic and/or viral liver disease found silymarin did not significantly reduce mortality or complications — tempering the popular perception of milk thistle as broadly hepatoprotective.
- Silybin combined with phosphatidylcholine and vitamin E in patients with nonalcoholic fatty liver disease
12-month RCT (n=138) in NAFLD found a silybin-phosphatidylcholine-vitamin E complex reduced insulin resistance and liver enzymes vs placebo, supporting phytosome forms of silymarin for NAFLD.
Browse all curated studies →
Mechanism of Action
- • Protects liver cell membranes
- • Stimulates protein synthesis for regeneration
- • Antioxidant in liver tissue
- • May help with insulin sensitivity
Evidence Quality
Evidence Grade A
Strong evidence for liver protection
Safety & Contraindications
Serious Warnings
- • May affect estrogen-related conditions
Contraindications
- • Ragweed/daisy allergy
Common Side Effects
- • Rare: mild GI upset
- • Allergic reactions (ragweed family)
Pregnancy & Breastfeeding
Consult healthcare provider
Liver & Kidney Notes
Safe - specifically for liver support
Interactions
💊 Medications
- • May affect CYP450 metabolism
- • Diabetes medications (may enhance)
- • Statins (may affect levels)
🧪 Supplements
- • Synergistic with NAC, artichoke
🍽️ Food & Alcohol
- • Take with food
Stacking & Synergies
Pairs Well With
Avoid Combining With
None significant
Best Goal Synergies
Liver healthDetoxification
Buying Guide
What to Look For
- • 70-80% silymarin standardization
- • Phytosome for better absorption
Standardization Markers
Silymarin percentage (70-80%)Silybin content
Adulteration risk
Low
Practical Notes
- • Phytosome form better absorbed
- • Safe for long-term use
- • Most studied liver herb
Tags
liverdetoxhepatoprotectiveantioxidantliver-supportherbaltraditional-medicine
Top Products with Milk Thistle (Silymarin)
Highest-scored catalog products containing Milk Thistle (Silymarin), ranked by our scoring engine.
Liver CleanseThorne90
MediClear-SGS™ - VanillaThorne86
MediClear Plus®Thorne73
MediClear-SGS™ - ChocolateThorne73
Related Guides
In-depth guides covering Milk Thistle (Silymarin) — protocols, comparisons, and use cases.
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Artichoke
Liver and digestive support herb that promotes bile flow, lowers cholesterol, and protects liver cells.
Astragalus
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Burdock Root (Arctium lappa)
Traditional blood cleanser and liver support herb with prebiotic fiber and gentle detoxification properties.
Last reviewed: September 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.
Cite this page
Formulate Research Team. (2026, September). Milk Thistle (Silymarin) — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/milk-thistle
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.