Milk Thistle

Milk Thistle is a Botanical supplement available in 1 form.

Not all forms of Milk Thistle are equal. The form you choose determines how much Milk Thistle actually reaches your tissues, and the difference between the best and worst forms can be substantial. Milk thistle seed extract standardized for silymarin content—the collective flavonolignan complex including silybin, silydianin, and silychristin—provides the active hepatoprotective compounds. Research consistently supports silymarin-standardized milk thistle for promoting healthy liver cell membrane integrity, Phase I/II detoxification, and liver antioxidant defense.

Milk Thistle (Silybum marianum) Seed extract (80% Silymarin) Preferred (Preferred Form) has a bioavailability rating of good absorption.

Milk Thistle (Silybum marianum) seed extract provides silymarin — a complex of flavonolignans (silybin, silydianin, silychristin) that support liver cell membrane integrity and glutathione regeneration. It is one of the most extensively studied hepatoprotective botanicals, with clinical evidence for liver enzyme normalization and hepatocyte protection.

Crossover PK in 24 healthy males; characterizes oral silibinin AUC/Cmax from standardized silymarin capsule and tablet forms. PMID: 14692709

Human absorption/metabolism study (n=14); standardized milk thistle extract showed ~0.45% oral bioavailability with extensive phase-II conjugation. PMID: 23072776

Milk thistle extract delivers silybin, its principal active compound, into circulation after oral intake — and formulation meaningfully affects how much is absorbed. PMID: 29273470

Milk Thistle (Silybum marianum) Seed extract (80% Silymarin) is classified as Preferred Form by FormulaForge — our top recommendation for Milk Thistle. It carries a bioavailability rating of good absorption, meaning more of the active compound reaches your tissues per dose unit compared to lower-rated forms.

When choosing a Milk Thistle supplement, read the label for the specific form name — that is what determines how much you actually absorb. Preferred Forms have the strongest research-backed evidence for efficient absorption.

Other forms may be appropriate depending on individual goals, cost considerations, and your healthcare provider’s guidance. The best form for you depends on your specific health needs.

Individual dose requirements vary based on health goals, body weight, and existing nutrient intake. Your healthcare provider can help you determine an appropriate amount of Milk Thistle for you.

Side Effects: Consult your healthcare provider regarding tolerability, particularly at higher doses.

These statements are based on structure/function research and have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider before starting or changing a supplement regimen.

The following studies and findings inform FormulaForge classifications for Milk Thistle:

Crossover PK in 24 healthy males; characterizes oral silibinin AUC/Cmax from standardized silymarin capsule and tablet forms. PMID: 14692709

Human absorption/metabolism study (n=14); standardized milk thistle extract showed ~0.45% oral bioavailability with extensive phase-II conjugation. PMID: 23072776

Milk thistle extract delivers silybin, its principal active compound, into circulation after oral intake — and formulation meaningfully affects how much is absorbed. PMID: 29273470