Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| NAC (N-Acetyl Cysteine) | Saw Palmetto (Serenoa repens) | |
|---|---|---|
| Category | Supplements | Supplements |
| Standard Dose | 600-1200mg daily | 320mg daily (standardized to 85-95% fatty acids and sterols) |
| Timing | On empty stomach for best absorption, 30 min before meals. Split doses if >600mg. | With food (fat-soluble lipophilic extract). Morning or evening. |
| Cycle Duration | Cycle 8 weeks on, 2 weeks off (to avoid potential downregulation of endogenous GSH production) | Minimum 3 months to assess response; ongoing for maintenance |
| Evidence Level | strong_human | moderate_human |
NAC is a precursor to L-cysteine, the rate-limiting substrate for glutathione (GSH) synthesis via glutamate-cysteine ligase. It directly replenishes intracellular GSH, the master endogenous antioxidant. NAC also modulates glutamatergic neurotransmission by stimulating the cystine-glutamate antiporter (system Xc-), influencing extrasynaptic glutamate levels. Additionally, it acts as a mucolytic by cleaving disulfide bonds in mucus glycoproteins.
600-1200mg daily
On empty stomach for best absorption, 30 min before meals. Split doses if >600mg.
Cycle 8 weeks on, 2 weeks off (to avoid potential downregulation of endogenous GSH production)
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
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