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S-23 High Affinity, 20 mg

4.82 out of 5
(71 customer reviews)




S-23 High Affinity Research Profile:


Description: 3rd gen SARM; simlar to S-4 but higher AR affinity; strong effects on muscle growth and strength gains; often cited as dry/hard/lean anabolic SARM.

Known for: Increasing muscle mass and strength.

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

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


S-23 High Affinity 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


* These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. 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 this website 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 products. By using this site and/or purchasing our products, you certify you and/or your organization is/are qualified to possess, handle, and administer the products you purchase, that SARMTECH and its owners/agents are not liable for any unintended effects or outcomes, and that you are 21 years of age or older.


71 reviews for S-23 High Affinity, 20 mg

  1. 5 out of 5

    Mjjc5291 (verified owner)

    Like s4 highly suppressive/twice as suppressive. Must pct. more significant dryness and gains in strength size, and recovery all while cutting. Cycled 8 weeks then 12 weeks off. Very strong compared to other companies. Serious users only!

  2. 5 out of 5

    Drew Hibbard (verified owner)

    Research went great. Fast shipping, and excellent customer service.

  3. 5 out of 5

    Anthony (verified owner)

    Showed results in research fast!

  4. 4 out of 5

    Dgoodsell (verified owner)

    Great for hardening. Gives me a great look very strong

  5. 5 out of 5

    Fred Baier (verified owner)

    My favorite sarm, start seeing and feeling results tight away!!

  6. 5 out of 5

    Dgoodsell (verified owner)

    This has become my new favorite SARM.

  7. 5 out of 5

    Mudiser S. (verified owner)


  8. 5 out of 5

    BIlly P. (verified owner)


  9. 5 out of 5


    My new go-to sarm from sarmtech, always my go-to supplier! S23 seems to work more like rad than s4. Good strength and mass gains. Good price and one of the few places to find!

  10. 5 out of 5

    Anonymous (verified owner)

    Works! It’s the real deal!

  11. 5 out of 5

    Patrick Madis (verified owner)

    Great results first 7 wks even having to spend last 3 wks researching from home. 5 wks to go will just continue on maintenance. 90 capsules gets 12 weeks which is impressive supply at good dosing level. Plus only place I was able to find s23 yk11 and stenabolic. Well done Sarmtech keep it up!

  12. 5 out of 5

    Mike (verified owner)

    Excellent product to unlock beast mode.

  13. 5 out of 5

    C Evans (verified owner)

    Good S4. Trusted source.

  14. 3 out of 5

    Shawn Blackburn (verified owner)


  15. 4 out of 5

    Anonymous (verified owner)


  16. 5 out of 5

    Lupe (verified owner)

    Will be 50 in 2 months and my strength gains after 2 weeks are crazy! Putting on muscle again fast !

  17. 5 out of 5

    Dietrich J (verified owner)

    This stuff is the real deal… Stack it with Rad140 n LGD

  18. 5 out of 5

    Nicholas F. (verified owner)

    All I can say is wow! My research has gone amazing! I was skeptical about researching with them but not anymore and this company is top notch by far

  19. 5 out of 5

    Albert H. (verified owner)


  20. 5 out of 5

    Brandon Davis (verified owner)

    Amazing product. Top tier quality.

  21. 5 out of 5

    Anonymous (verified owner)

    Love this product. The hype was real and no noticeable side effects

  22. 5 out of 5

    Anonymous (verified owner)


  23. 4 out of 5

    Anonymous (verified owner)


  24. 5 out of 5

    Matthew (verified owner)

    Definitely seeing a difference in both strength and size. Appetite a bit out of control but overall great experience

  25. 5 out of 5

    Jeff R. (verified owner)


  26. 4 out of 5

    Devan (verified owner)

    Great strength gain, noticeable side effects though.

  27. 5 out of 5

    Anonymous (verified owner)

    Great product.. immediate results

  28. 5 out of 5

    Andrew Cameron (verified owner)

    Research subject combined this with LG4033 and saw great results!

  29. 5 out of 5

    Anonymous (verified owner)


  30. 4 out of 5

    James M. (verified owner)

    Excellent service quality is great

  31. 5 out of 5

    Michael Robertson (verified owner)


  32. 5 out of 5

    Daniel (verified owner)

    Love this stacked with MK2866

  33. 5 out of 5

    Anonymous (verified owner)

    Amazing product. Subject takes 40mg 30-45 minutes before strength training. Hitting new pr every three weeks. No side effects have been noticed as of yet, have been taking product for about a month.

  34. 4 out of 5

    Drew (verified owner)


  35. 3 out of 5

    David Clark (verified owner)


  36. 5 out of 5

    Martini B. (verified owner)

    S23 gives much more strength with weightlifting and also helps with day to day activities. Subject is 55 yrs old and feels a lot better.

  37. 5 out of 5

    Fred (verified owner)

    Great A product, results instantly

  38. 5 out of 5

    Kirk Townsend (verified owner)


  39. 5 out of 5

    Anonymous (verified owner)

    Awesome Increase of strength and size. I highly recommend it.

  40. 5 out of 5

    BL (verified owner)


  41. 4 out of 5

    steve s. (verified owner)

    Helped put size on but made subject hungry as shit

  42. 4 out of 5

    Gabriel O. (verified owner)

    Strengthn gains…

  43. 5 out of 5

    Anonymous (verified owner)


  44. 5 out of 5

    PJ (verified owner)

    This is the good stuff, but honestly once daily is fine. No evidence that >20 mg per 24 hrs has any more a/r binding. If you’re looking for solid muscle mass this is it. Good job SARMTECH 3rd product of yours I’ve bought and so far 3 for 3 !!! :0

  45. 5 out of 5

    Terrance M. (verified owner)

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

  46. 5 out of 5

    Cedric (verified owner)

    Strong stuff, works.

  47. 5 out of 5

    kevtrainer (verified owner)

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

  48. 5 out of 5

    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.

  49. 5 out of 5

    Anonymous (verified owner)

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

  50. 4 out of 5

    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.

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