S-23 | 100 x 10mg

S-23 is a highly potent, non-steroidal Selective Androgen Receptor Modulator (SARM) developed to investigate anabolic and male contraceptive effects. Structurally related to S-4 (Andarine), S-23 was optimized for greater receptor affinity, higher oral bioavailability, and more complete suppression of spermatogenesis in preclinical models. Preclinical data indicate that S-23 exhibits high selectivity for androgen receptors, eliciting potent anabolic effects in skeletal muscle and bone, while exerting limited activity in androgen-sensitive tissues such as the prostate.

In laboratory studies, S-23 has been shown to:

• Induce dose-dependent increases in lean body mass, accompanied by reductions in fat mass, without significant fluid retention
• Enhance skeletal muscle mass and performance-related parameters under controlled dietary conditions
• Suppress serum levels of endogenous testosterone and luteinizing hormone (LH) more profoundly than comparator SARMs, supporting investigation in the context of male contraception
• Reduce androgen-induced prostate enlargement, despite exhibiting potent anabolic activity in muscle and bone tissues
• Demonstrate hormonal recovery following cessation of administration, consistent with dose-dependent reversibility of hypothalamic–pituitary–gonadal (HPG) axis suppression in animal models

Due to its aggressive anabolic profile, S-23 is often researched for recomposition models, hormone suppression protocols, and evaluation of its dual anabolic and contraceptive action.

CAS Number: 1010396-29-8
Molecular formula: C18H13ClF4N2O3
Purity: ≥99% (see HPLC and COA documentation)
Concentration: 10 mg
Molar mass: 416.76 g/mol
Half-life: Estimated ~11–12 hours

⚠ Important Note: This product is supplied strictly for laboratory research use only. It is not approved for human consumption or therapeutic use. Not intended to diagnose, treat, cure, or prevent any disease.