S23 is a promising Selective Androgen Receptor Modulator (SARM) being researched for potential use as a male contraceptive. [1] It has a strong connection to the androgen receptor, producing anabolic effects specific to muscles and bones. [2] Preclinical reports uncovered that S23 exhibited the strongest suppressive properties out of the SARMs being developed and led to sterility in all the rats subjected to the drug. [1]

S23 is a powerful choice for recreational bodybuilding due to its ability to aid muscle growth and reshape bodies. [2] It has been shown to reduce the size of the prostate, unlike anabolic steroids which can cause swelling. [3] S-23 has higher androgenic properties than other SARMs, leading to a variety of side effects.

S23 Beginners Guide by Sarms.io

CAS: 1010396-29-8
Molecular Weight: 416.753 g/mol
Chemical formula: C18H13ClF4N2O3
Chemical name: (2S)-N-(4-cyano-3-trifluoromethylphenyl)-3-(3-fluoro-4-chlorophenoxy)-2-hydroxy-2-methyl-propanamide
Type: Selective Androgen Receptor Modulator


  • Builds lean muscle mass quickly
  • Increases strength performance
  • Promotes fat loss and improves body composition
  • Increases bone mineral density


  • Suppresses natural testosterone production and spermatogenesis
  • Potential side effects include mood changes and aggression

S23 For Sale

Venture into our thoughtfully compiled selection of S23 sources, chosen for their premium products and reliable shipping. Trust our expertise to help you unlock the muscle-building and body-sculpting benefits of S23. Embrace your fitness journey with the support of the industry’s most trusted providers, ensuring your success and satisfaction.

Sports Technology Labs

30ml of S23 solution at 20mg/ml. Use code sarmsdotio for 15% off your entire purchase at STL!
S23 SARM from Chemyo

Chemyo Best Value

50ml of liquid S23 solution at 20mg/ml. Use code sarmsdotio for 10% off your entire purchase at Chemyo!
Paradigm Peptides S23

Paradigm Peptides Best Values

60 capsules at 5mg each = 300mg total
S23 Liquid available from Behemoth Labz

Behemoth Labz

Use code BHM31 for 10% off your entire purchase at Behemoth Labz!
750mg S23 Liquid Solution from Science.bio

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You can view the full list of verified sources here


  1. Jones, Amanda, et al. “Nonsteroidal Selective Androgen Receptor Modulators Enhance Female Sexual Motivation.” Journal of Pharmacology and Experimental Therapeutics, vol. 334, no. 3, 2010, pp. 1-13.
  2. Schmidt, Azriel, et al. “Identification of Anabolic Selective Androgen Receptor Modulators with Reduced Activities in Reproductive Tissues and Sebaceous Glands.” Journal of Biological Chemistry, vol. 284, no. 52, 2009, pp. 36367-36381.
  3. Segal, Narayanan, Dalton (2006). Therapeutic potential of the SARMs: revisiting the androgen receptor for drug discovery. Expert Opinion on Investigational Drugs, 4(15), 377-387.