We provide Triple-Lab Certification and redundant 3rd-Party tests on our 4 top-sellers - the only supplier to do this.

Purchase this product and earn 233 Reward Points ($2.34) ?

S-23, 20 mg, 90 ct (NEW)

(6 customer reviews)


372 in stock (can be backordered)



S-23 Research Profile:


Description: A 3rd gen SARM. Simlar to S-4, but higher AR affinity. Strong effects on muscle growth and strength gains.

Known for: Bulking, fast muscle mass growth.

Commonly stacked with: Typical bulking stack: S-23, MK-2866, YK-11, MK-677

Side-effects: Testosterone suppression with prolonged use; no reports of other adverse side-effects


S-23 (Andarine) Chemical Profile:

Clinical data

Selective Androgen Receptor Modulator
S23, S-23
By mouth
US: Investigational New Drug
GTX, Inc.

Pharmacokinetic data

12 hours


(2S)-N-(4-cyano-3-trifluoromethylphenyl)-3-(3-fluoro-4 -chlorophenoxy)-2-hydroxy-2-methyl-propanamide

Chemical and physical data

416.753 g/mol
C[C@](COC1=CC(=C(C=C1)Cl)F)(C (=O)NC2=CC(=C(C=C2)C#N)C(F)(F)F)O
1S/C18H13ClF4N2O3/c1-17(27,9-28-12- 4-5-14(19)15(20)7-12)16(26)25-11-3-2-10 (8-24)13(6-11)18(21,22)23/h2-7, 27H,9H2,1H3,(H,25,26)/t17-/m0/s1

S-23 SARM Molecular Structure
S-23 SARM Molecular Structure

SARM S23 Chemical Molecular 3D Structure
SARM S23 Chemical Molecular 3D Structure

Open (opens in new tab and takes a moment to render)

Selective Androgen Receptor Modulators (SARMs) have not been approved in the US by the FDA for human consumption as dietary supplements. In accordance with US laws pertaining to the use of Investigational New Drugs (IND's) products labeled as SARMs on sarmtech.net are sold for laboratory and clinical research purposes only, are intended solely for investigational use, and are to be used exclusively for purposes of a clinical trial that is the subject of an effective investigational new drug application; otherwise, you are not authorized to purchase our SARM products. You are not permitted to sell or resell any of our products. By using this site and/or purchasing our products, you agree SARMTECH is not liable for any unintended effects or outcomes. You are not permitted to use or purchase from sarmtech.net if you are under 21 years of age.


Additional information

Weight 3 oz

Lab Analysis

COA (Certificate of Analysis) - S23
COA (Certificate of Analysis) – S23
3rd Party Lab Test – S23
3rd Party Lab Test – S23

6 reviews for S-23, 20 mg, 90 ct (NEW)

5 star
4 star
3 star
2 star
1 star
  1. Sam S. (verified owner)

    This is a strong hardening SARM and gives great aggression in the gym. It also suppresses estrogen rather quickly so the research subject may need to take it Mon-Fri or every other day. Cosmetically, this will give the subject a very shredded looking physique.

    Was this review helpful to you?
  2. Anonymous (verified owner)

    Love. Stronger than S4. Old guy with new fav.

    3 out of 3 people found this helpful. Was this review helpful to you?
  3. Mike (verified owner)

    I was fortunate to receive a pre-sale version of this product (thanks Sarmtech!). For me it performed like S4 or RAD140. Which is to say it performed well. Seemed fast-acting – inc. vascularity in subject after 7 days when usually takes a few weeks with RAD or S4. Talk of this being a “super sarm” etc is exaggerated. It’s good, period.

    2 out of 2 people found this helpful. Was this review helpful to you?
  4. kevtrainer (verified owner)

    Excellent product stacked with mk677 and yk11, my rat’s pumps are through the roof, great for vascularity

    2 out of 2 people found this helpful. Was this review helpful to you?
  5. Cedric (verified owner)

    Strong stuff, works.

    1 out of 1 people found this helpful. Was this review helpful to you?
  6. Terrance M. (verified owner)

    Research subject had respectable improvements in muscle mass and unexpected amount of fat loss.

    Was this review helpful to you?

Only logged in customers who have purchased this product may leave a review.