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S-23 High Affinity, 20 mg

4.83 out of 5
(78 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.


78 reviews for S-23 High Affinity, 20 mg

  1. 5 out of 5

    Ronald Dombkowski II (verified owner)

    Awesome product โ€ฆ seeing noticeable gains in subject.

  2. 5 out of 5

    Sean (verified owner)

    Product is very strong 2 week in 20mg a day iall you need plus diet 5 times at the gym 1%


  3. 5 out of 5

    Douglas McMinn (verified owner)

    this works for going off cycling… nice product

  4. 5 out of 5

    David Tyler (verified owner)

    I’ve used SARMTECH pretty regularly and have yet to run into anything that felt bunk. They’re always on top of their game with shipping times and I’ve had great results all around. S23 is hella suppressive so I highly suggest running a test base with it.

  5. 5 out of 5

    Jay Caballero (verified owner)

    Works good

  6. 5 out of 5


    This one is strong!! Subject has noticeable gains in overall size and strength.

  7. 5 out of 5

    Jason Gould

    Subject taking 20mg a day and has seen noticeable changes in lean body mass and overall strength. Great product!!!

  8. 5 out of 5

    Kevin Shuman (verified owner)

    Very happy. Stacked with RAD-140 and have seen strength and size gains, pretty quickly. Helped with longer, more intense workouts. Would definitely recommend.

  9. 5 out of 5

    Sean (verified owner)

    great product S23 works as described!!

  10. 5 out of 5

    Brent Barker (verified owner)

    Great product, [subject] noticed increased strength within 4 weeks

  11. 5 out of 5

    Joseph Swantack (verified owner)

    There is nothing better than the S-23 from Sarm.Tech. This is the real deal! Professional packaging all the way to the awesome results has me stoked!

  12. 5 out of 5

    James Masden (verified owner)

    Been using sarms for 5 yrs now and this is the best ive ever used….obvious strength n size gains in 4 weeks….just an amazing product….already ordered again

  13. 5 out of 5

    Adam Villalvazo (verified owner)


  14. 5 out of 5

    Logan Broussard (verified owner)

    Highly recommended, subject noticed small results around 3rd week, big results at the 6th-8th week mark & at 12 weeks sustained feeling as well an improved visual of the physical body. Note: Subject had a diet plan while using supplement.

  15. 5 out of 5

    Adam Villalvazo (verified owner)

    great product definitely recommend it saw a dramatic change

  16. 5 out of 5

    Stefan Mensch (verified owner)


  17. 5 out of 5

    Stefan Mensch


  18. 5 out of 5

    Dave Bellotti (verified owner)

    After three weeks Subject noticed slow but steady strength gains using 20mg a day on off days and 40mg split in two doses on training days. This is a solid product and works well.

  19. 5 out of 5

    Steve Chambers (verified owner)

    S-23 is amazing strength is awesome subject has dubbed in size

  20. 5 out of 5

    Steve Chambers (verified owner)

    Love this product already seeing gains in first week very impressed

  21. 5 out of 5

    Adam Villalvazo (verified owner)

    Great product highly recommend saw a big change while [subject] on it a must buy

  22. 5 out of 5

    Scott Michael

    Great product! Works as described!

  23. 5 out of 5

    Mark White

    Awesome underated Sarm. One of the most potent. Research with caution (such as PCT)

  24. 5 out of 5


    Research subject saw gains with Rad-140 and LGD. When S-23 was added to the stack it increased strength, muscle mass, and gains. Highly recommend.

  25. 5 out of 5

    Kirk Townsend (verified owner)

    Awesome sarms. Beast mode to the max.

  26. 5 out of 5

    John Newell (verified owner)

    Very fast shipping, product is the real deal, great communication

  27. 5 out of 5

    T Paretti

    On cardarine/gw and s23 for 4 weeks and seems like stamina during workouts and runs is up considerably. Biceps are getting veiny too but not sure how much is s23 or the protein/nitric oxide/citrulline etc subject is also running. Thinking both ๐Ÿ™‚ Overall very pleased with the company, price and value solid, shipping fast. No issues. Like all the lab tests. This is a legit provider ๐Ÿ’ช๐Ÿ’ช

  28. 5 out of 5

    J Valencia

    Sarms user for 4 years and never even heard of this before buying it here. Will check in after full cycle but at 3 weeks I can say it’s solely responsible for adding 5-10 lb solid muscle mass. Very disciplined training and diet, as always, but adding sarmtech creatine and S23 is the only change I’ve made. Assuming bad suppression sides I will DEFINITELY be back for more of this new go-to.

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All SARMs are Triple-Lab Certified

S-23 High Afiinity SARM Capsules
S-23 High Afiinity SARM Capsules
MZ Biolabs S-23 Quant Test
MZ Biolabs S-23 Quant Test
Jano S-23 Third Party Lab Test
Jano S-23 Third Party Lab Test
MZ Biolabs S-23 Third Party Lab Test 2020-10-19
MZ Biolabs S-23 Third Party Lab Test 2020-10-19
Jano S23 High Affinity Third Party Lab Test
Jano S23 High Affinity Third Party Lab Test
COA - S23
COA – S23 High Affinity Lab Test
S-23 High Afiinity SARM Capsules
S-23 High Affinity, 20 mg