Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Saw Palmetto (Serenoa repens) | Sulforaphane (Broccoli Seed Extract) | |
|---|---|---|
| Category | Supplements | Supplements |
| Standard Dose | 320mg daily (standardized to 85-95% fatty acids and sterols) | 10-30mg sulforaphane daily (equivalent to ~100-200mg broccoli seed extract standardized to glucoraphanin + myrosinase) |
| Timing | With food (fat-soluble lipophilic extract). Morning or evening. | 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 | Minimum 3 months to assess response; ongoing for maintenance | ongoing |
| Evidence Level | moderate_human | strong_human |
Saw palmetto berry extract contains fatty acids (lauric acid, oleic acid, myristic acid) and phytosterols (beta-sitosterol) that inhibit both isoforms of 5-alpha-reductase (types I and II), reducing conversion of testosterone to dihydrotestosterone (DHT). It also exhibits anti-androgenic activity by competing with DHT at androgen receptor binding sites. Additional mechanisms include: inhibition of cyclooxygenase and 5-lipoxygenase (anti-inflammatory in prostate tissue), induction of apoptosis in prostate epithelial cells, and relaxation of bladder smooth muscle via alpha-1 adrenergic receptor antagonism.
320mg daily (standardized to 85-95% fatty acids and sterols)
With food (fat-soluble lipophilic extract). Morning or evening.
Minimum 3 months to assess response; ongoing 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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