Milk Thistle (Silymarin)

Botanical

Also known as: Silybum marianum, Silymarin, Silybin, Milk Thistle Extract (Silybum marianum), Milk Thistle Seed Extract

Grade A

💊 200-400mg standardized extract 2-3x daily🎯 8 primary uses🔗 4 synergies⚠️ Review warnings

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 trials
Rambaldi 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
Loguercio C, Andreone P, Brisc C, et al. · 2012 · Free Radical Biology and MedicineRCTPubMed ↗
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.

PubMed (RCTs) ↗Randomized trials PubMed (all) ↗Full literature Cochrane Reviews ↗Systematic reviews Examine.com ↗Research summaries

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

NAC ↗Artichoke extract ↗Dandelion ↗B vitamins ↗

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

Top Products with Milk Thistle (Silymarin)

Highest-scored catalog products containing Milk Thistle (Silymarin), ranked by our scoring engine.

Browse all Milk Thistle (Silymarin) products →

Related Guides

In-depth guides covering Milk Thistle (Silymarin) — protocols, comparisons, and use cases.

Best Supplements for Fatty Liver↗

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Last reviewed: June 2026 by the Formulate Research Team. Sources cited above; methodology and scoring criteria published here.

Cite this page

Formulate Research Team. (2026, June). 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.