S-23
S-23 is a catalog-expanded sarm entry in ProtoComp's source-backed compound corpus. It is included for search, calculator math, stack awareness, and future research curation based on add sarm category and seed, expand compound catalog, explicit_target_list, local_seed, project_target. Published dosing, cycle length, and clinical-use claims are intentionally left null until compound-specific evidence is reviewed.
Highly potent and suppressive SARM. Investigated as a male contraceptive in preclinical studies due to profound HPG axis suppression.
Significant suppression — long post-cycle therapy periods common.
Off-cycle: 8 weeks
Short half-life requires split dosing.
Contraindications
- • Liver disease
- • Cardiovascular disease
- • Fertility planning
- • Pregnancy
Common side effects
- • Profound HPG suppression
- • Aggression
- • Sleep disturbance
- • Hair shedding
Serious risks
- • Severe testosterone suppression — reversibility uncertain after extended use
- • Hepatotoxicity
- • Cardiovascular strain
Requires monitoring
- • Liver function
- • Testosterone
- • Lipid panel
Pregnancy / breastfeeding
Contraindicated
Male
Contraceptive-level suppression — not recommended for men trying to conceive
Female
Not recommended — virilization and suppression risk
- One of the most suppressive SARMs — not for beginners
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