Digestion/Hormonal/Inflammation

Milk Thistle

Herbal seed extract that may modestly improve liver enzymes and some metabolic markers in adults with liver stress.

Milk Thistle

Herbal seed extract that may modestly improve liver enzymes and some metabolic markers in adults with liver stress.

score

evidence

Caution

risk

Proven Benefits

01Improves ALT/AST in fatty liver

02May lower fasting glucose/HbA1c

03May lower CRP/TNF-α

04May lower ALT/AST on meds

05May improve fibrosis markers

Chemical Forms

Recommended

Silybin phytosome (silybin-phosphatidylcholine)
Standardized silymarin extract (70-80%)
Standardized silybin extract

Avoid

Raw milk thistle seed powder (variable active content)
Proprietary blends without declared silymarin or silybin content

Expert Note

Milk thistle's main actives are not absorbed especially well, so phytosome forms and well-standardized extracts give more predictable exposure than raw powders. Non-standardized seed products vary widely in silymarin content and are less likely to match doses used in human studies.

Protocol

Amount

200-420 mg silymarin equivalent

Frequency

Once to three times daily with meals, depending on form

When

With meals to improve tolerability; phytosome forms may allow lower doses than standard extracts.

Condition-Based Dosing

Standardized silymarin extract (70-80%)

280-420 mg daily, usually split into 2-3 doses— This is the most common evidence-based range in clinical trials.

Silybin phytosome form

160-240 mg daily, with meals— Enhanced-absorption forms may achieve similar exposure at lower labeled doses.

Safety & Limits

Upper Safe Limit

No official UL established; up to 2100 mg/day has been studied short-term in adults, but routine self-care use is usually 420 mg/day or less.

Cycling

Safe for continuous use

Contraindications

Ragweed or daisy family allergy — cross-reactivity and allergic reactions are possible

Pregnancy or breastfeeding — insufficient safety data at supplemental doses

Diabetes drugs or insulin — additive glucose lowering may increase hypoglycemia risk

Warfarin or other narrow-therapeutic-index drugs — possible CYP/P-gp interactions warrant pharmacist review

Synergies

Phosphatidylcholine

Binding silybin to phosphatidylcholine in a phytosome improves absorption and gives more predictable blood levels than plain extract.

NAC

Both support glutathione-related antioxidant defenses, a common pathway behind liver-focused protocols.

Avoid Combining With

✕Heavy alcohol use (directly counteracts liver-focused benefits)

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