What is the recommended dose of Milk Thistle?

- **Standard silymarin extract (80%):** 420-600mg/day in 3 divided doses - **Silybin phytosome (Siliphos):** 160-480mg/day (dramatically better absorbed) - **Liver protection (acute):** 600-800mg/d...

Is Milk Thistle safe to take daily?

Milk Thistle is rated "Use Caution" based on clinical evidence. - Mild GI effects (diarrhea, nausea), most common - Allergic reactions in ragweed/Asteraceae-allergic individuals (cross-reactivity) - Generally very well tolerated

Does Milk Thistle interact with any medications?

Milk Thistle has 6 known drug interactions, including interactions with CYP3A4 substrates, CYP2C9 substrates (warfarin), UGT substrates. Check with your doctor before combining with prescription medications.

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Ingredient Research

Graded against 173,636 supplements + 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, NIH DSLD

Milk Thistle

MODERATE EVIDENCEBotanicalLast updated April 2026

AVELOR SUMMARY

Milk thistle's active compound silymarin is the most studied hepatoprotective (liver-protective) natural compound, with evidence spanning alcoholic liver disease, NAFLD, drug-induced liver injury, and hepatitis. Our research shows it genuinely protects liver cells, but the bioavailability of standard silymarin is very poor. Phytosomal forms (Siliphos, Silybin Phytosome) dramatically improve absorption and clinical outcomes.

EVIDENCE GRADES

NAFLD (liver enzymes, steatosis)Moderate, multiple positive RCTs (UNCITED: the cited PMID did not support this claim and was removed; this statement is not currently sourced)

Drug-induced liver injury (DILI)Moderate, used clinically

B-

Alcoholic liver diseaseModerate, improved liver function markers

B-

Hepatitis C (adjunct)Mixed, some viral load reduction

C+

Chemotherapy hepatoprotectionPreliminary positive data

C+

Blood sugar (in diabetics with liver disease)Moderate, dual mechanism

B-

OPTIMAL DOSAGE

Standard silymarin extract (80%): 420-600mg/day in 3 divided doses
Silybin phytosome (Siliphos): 160-480mg/day (dramatically better absorbed)
Liver protection (acute): 600-800mg/day
Take with food, fat improves absorption of all forms

Scan a supplement containing Milk Thistle

DRUG INTERACTIONS

CYP3A4 substratesModerate

Silymarin inhibits CYP3A4 in vitro; clinical significance debated

CYP2C9 substrates (warfarin)Moderate

In vitro inhibition; may increase warfarin levels

UGT substratesModerate

Silymarin inhibits glucuronidation; may affect drug clearance

Sirolimus (rapamycin)Moderate

Case report of increased sirolimus levels

MetforminMinor

Silymarin may enhance metformin's effects on blood sugar

StatinsModerate

Both metabolized via CYP3A4; potential for increased statin levels

SAFETY PROFILE

Drug Interactions

Side Effects

Mild GI effects (diarrhea, nausea), most common
Allergic reactions in ragweed/Asteraceae-allergic individuals (cross-reactivity)
Generally very well tolerated

Pregnancy & Lactation

Traditionally used as a galactagogue. Limited safety data for pregnancy, avoid supplemental doses.

WADA Status

Not Prohibited

HOW AVELOR SCORES THIS

Phytosomal forms (Siliphos, Silybin Phytosome) score significantly higher than standard silymarin, 4-10x better bioavailability

Products using standardized 80% silymarin: acceptable but note bioavailability limitation

CYP interaction screen for users on narrow therapeutic index drugs (warfarin, sirolimus, cyclosporine)

Ragweed/Asteraceae allergy warning

Liver enzyme monitoring recommended for therapeutic use, both to track improvement and to ensure no paradoxical reaction

"Liver detox" marketing claims: flag, silymarin is hepatoprotective, not a "detox"

CLINICAL REFERENCES

Reference identifiers on this page are being re-verified against PubMed. Some may not yet link to the paper named beside them.

, Abenavoli L et al. Milk thistle in liver diseases: past, present, future.

PMID: 20564545

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Independently graded against 173,636 indexed supplements with 177 published clinical interactions, sourced from PubMed, FDA CAERS, openFDA, and NIH DSLD | Last updated: April 2026

Not medical advice. Based on published clinical research and systematic reviews.

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