Milk Thistle · Silybum marianum水飞蓟 · 奶蓟草

Place · Level 3

全球卖得最好的护肝草药 · 试管里的机制是真的, 但口服几乎到不了肝 · 静脉那一版是鹅膏菌中毒的真解毒剂, 干的却是另一件事 · Cochrane 与 SyNCH 大试验阴性 · 安全, 但它替掉的东西才是代价

Connected to · 9

regulates · 1

Glutathione
In cell and animal work silybin partly restores depleted glutathione, but very low oral exposure — circulating mostly as conjugates — is what decides whether that step can happen in a person.

contrast · 8

Liver
Milk thistle is the commonest ingredient on the liver-pill shelf, yet the liver's own phase I/II clearance workshop already runs continuously, and pooled randomized trials show no effect on mortality or complications of liver disease.
Hepatitis B
No herb has been shown to clear hepatitis B virus; pooling randomized trials in alcoholic and hepatitis B/C liver disease, milk thistle showed no significant effect on mortality or complications.
NAFLD / MASLD
In the steatohepatitis trial that read its endpoint from liver biopsy, 700 mg three times daily for 48 weeks failed the primary endpoint; the fibrosis-score improvement was a secondary finding.
Alcohol Metabolism
Milk thistle is often treated as permission to keep drinking, yet in alcoholic liver disease it showed no significant effect on mortality or complications; what changes outcome is the load on the ethanol-dismantling pathway itself.
N-Acetylcysteine
Both are sold as liver supplements, and both of their genuinely established clinical roles are intravenous and emergency — silibinin for Amanita poisoning, NAC for acetaminophen overdose — not at shelf doses.
Curcumin
The same bioavailability predicament: both act in a dish, while poor absorption plus rapid phase II conjugation after swallowing leaves free active compound far below experimental concentrations.
Saw Palmetto
Two specimens of one pattern: early small trials uniformly positive, then large randomized trials nulled it — Cochrane pooling and SyNCH for milk thistle, STEP and CAMUS for saw palmetto.
Herb Safety
The two ends of herbal safety: milk thistle is rated likelihood category E (unlikely) for liver injury, while Polygonum multiflorum carries documented injury in the same database — 'natural' means neither safe nor dangerous by itself.

What is actually in the capsule

Stop 1/7

瓶子里装的不是一种东西

That bottle of 'liver support' pills says silymarin on the label. Silymarin is not a single compound — it is a mixture of structurally related molecules. That sounds like a footnote, but it determines every argument about dose that follows.

The plant

Milk thistle is Silybum marianum, in the daisy family (Asteraceae). Native to the Mediterranean, now widely cultivated. The white veining on its leaves gave it the 'milk' name.

The part used is the seed — not the leaf, not the flower.

What comes out of the seed

Purified seed extract is called silymarin, a collective name for a group of flavonolignans, at least four or five distinct molecules:

Silybin A and B (also written silibinin) — the most abundant and by far the most studied, roughly half the mixtureIsosilybinSilychristinSilydianinPlus some taxifolin
So the number on the box has to be read twice. A capsule labelled '300 mg extract, standardized to 80% silymarin' contains 240 mg of the mixture; the fraction that is actually silybin is only a bit over a hundred milligrams. Some papers dose by silymarin, others by silybin, and the two differ roughly two-fold. When two brands' doses don't line up, check which one they are counting.

This island answers three questions: what it does inside a cell, whether a swallowed capsule ever gets there, and why an emergency room genuinely does use it.

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