What is S23?
S23 is one of the most potent SARMs ever developed, with an anabolic-to-androgenic ratio that approaches anabolic steroids. It causes near-complete testosterone suppression (it was studied as a male contraceptive) and produces dramatic muscle and strength gains. It is not for beginners and requires careful PCT management.
Mechanism of Action
S23 binds to androgen receptors with extremely high affinity and full agonist activity in muscle and bone. Its high binding affinity causes near-complete suppression of LH and FSH, essentially shutting down natural testosterone production. This makes it one of the most suppressive SARMs.
S23 Dosing Protocol
10–25 mg/day oral, split into 2 doses. Cycle: 6–8 weeks maximum. Aggressive PCT required (Nolvadex + Clomid). Bloodwork is essential.
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S23 Benefits
Side Effect Profile
Near-complete testosterone suppression (essentially shuts down HPTA), aggression, potential hair loss (androgenic), liver stress. Requires aggressive PCT. Not suitable for beginners or women.
S23 Stacking Guide
S23 works synergistically with these compounds. Click any to learn more, or ask PepBot to build you a complete stack.
Research & Citations
Frequently Asked Questions about S23
Is S23 safe?
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