Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Milk Thistle (Silymarin) | Sulforaphane (Broccoli Seed Extract) | |
|---|---|---|
| Category | Supplements | Supplements |
| Standard Dose | 200-400mg silymarin daily (standardized to 70-80% silymarin) | 10-30mg sulforaphane daily (equivalent to ~100-200mg broccoli seed extract standardized to glucoraphanin + myrosinase) |
| Timing | With meals. Split doses for higher amounts. Phytosome form can be taken without food. | On empty stomach or with light meal. Myrosinase enzyme required for conversion from glucoraphanin — ensure supplement contains it or add mustard seed powder. |
| Cycle Duration | Cycle 8-12 weeks for liver support; ongoing at low dose for maintenance | ongoing |
| Evidence Level | strong_human | strong_human |
Silymarin is a complex of flavonolignans (silybin A, silybin B, silychristin, silydianin, isosilybin) with silybin being the most active. Hepatoprotective mechanisms: stabilizes hepatocyte cell membranes by altering outer lipid layer composition (preventing toxin penetration), stimulates ribosomal RNA polymerase I (accelerating hepatocyte protein synthesis and regeneration), inhibits NF-kB and TNF-alpha (anti-inflammatory), scavenges free radicals (both ROS and RNS), promotes glutathione synthesis (increases intracellular GSH by 35%), and inhibits hepatic stellate cell activation (anti-fibrotic). Silybin also activates AMPK and enhances bile flow.
200-400mg silymarin daily (standardized to 70-80% silymarin)
With meals. Split doses for higher amounts. Phytosome form can be taken without food.
Cycle 8-12 weeks for liver support; ongoing at low dose for maintenance
Sulforaphane is the most potent natural activator of the Nrf2-ARE (antioxidant response element) pathway. It modifies Keap1 cysteine residues, releasing Nrf2 to translocate to the nucleus and upregulate >200 cytoprotective genes including NQO1, glutathione S-transferases, heme oxygenase-1, and UDP-glucuronosyltransferases (Phase II detox enzymes). It also inhibits HDAC activity (epigenetic modification), induces Phase II/III xenobiotic metabolism, and suppresses NF-kB inflammatory signaling.
10-30mg sulforaphane daily (equivalent to ~100-200mg broccoli seed extract standardized to glucoraphanin + myrosinase)
On empty stomach or with light meal. Myrosinase enzyme required for conversion from glucoraphanin — ensure supplement contains it or add mustard seed powder.
ongoing
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