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S-4 (Andarine), 25 mg

4.67 out of 5
(127 customer reviews)




S-4 (Andarine) Research Profile:


Description: A 1st gen SARM. Very anabolic. Moderate metabolic improvements. Tried-and-true.

Known for: Increasing muscle mass, bulking, some fat loss

Commonly stacked with: Typical bulking stack: S-4, YK-11, MK-677 | optional: MK-2866

Side-effects: Testosterone suppression with prolonged use; temporary blurry or "yellow tint" vision in some users


S-4 (Andarine) Chemical Profile:

Clinical data

Selective Androgen Receptor Modulator
S4, S-4, Andarine, Andarin, Acetamidoxolutamide, Androxolutamide, GTx-007
By mouth
US: Investigational New Drug
GTX, Inc.

Pharmacokinetic data

4-6 hours


(2S)-3-(4-acetamido-phenoxy)-2-hydroxy-2-methyl-N- (4-nitro-3-trifluoromethyl-phenyl)-propionamide

Chemical and physical data

441.357 g/mol
FC(F)(F)c1cc(ccc1[N+]([O-])=O)NC (=O)[C@@](O)(COc2ccc(cc2)NC(=O)C)C
1S/C19H18F3N3O6/c1-11(26)23-12-3-6-14 (7-4-12)31-10-18(2,28)17(27)24-13-5-8-16(25(29)30) 15(9-13)19(20,21)22/h3-9,28H,10H2, 1-2H3,(H,23,26)(H,24,27)/t18-/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.


127 reviews for S-4 (Andarine), 25 mg

  1. Avatar
    4 out of 5

    Scott B. (verified owner)

    Research concluded! Good results

  2. Avatar
    4 out of 5

    Anonymous (verified owner)


  3. Avatar
    5 out of 5

    Steve Whalin (verified owner)


  4. Avatar
    5 out of 5

    John (verified owner)

    Excellent product but comes with vision side effects.

  5. Avatar
    4 out of 5

    Peter K. (verified owner)

    It’s a good product, however I brought the wrong thing. I wanted Ostarine instead. But can not afford to buy another.

  6. Avatar
    5 out of 5

    Anonymous (verified owner)

    Hands down, the best product for giving your research product them strength gains.

  7. Avatar
    5 out of 5

    Matt (verified owner)


  8. Avatar
    4 out of 5

    Gidano Marchigano (verified owner)

    Not the company’s fault, but the visual effects my subject got from using it were a little much..

  9. Avatar
    5 out of 5

    Mike (verified owner)


  10. Avatar
    5 out of 5

    Stepfon (verified owner)

    100% legit, 100% reco

  11. Tim
    4 out of 5

    Tim (verified owner)

    Liked the effects from this one other than pretty bad night blindness.

  12. Avatar
    5 out of 5

    Raymond (verified owner)


  13. Avatar
    5 out of 5

    Nelson Reyes (verified owner)

    Hardens muscles and builds a solid foundation

  14. Avatar
    5 out of 5

    Marc S. (verified owner)

    Very happy with this product. Subject has achieved desired results.

  15. Avatar
    5 out of 5

    Kevin (verified owner)


  16. Avatar
    5 out of 5

    jayvazq (verified owner)

    Research subject made substantial progress with strength and muscle mass

  17. Avatar
    5 out of 5

    Cerosa (verified owner)

    Excellent product. Good results.

  18. Avatar
    5 out of 5

    Mjjc5291 (verified owner)

    Extremely strong!!! Highly suppressive. Lean gains with increase in strength and stamina even during cut cycles. Would highly recommend for prep/pre competition

  19. Avatar
    4 out of 5

    ranger91580 (verified owner)

    Test subject had the desired results associated with s-4 as well as some undesired results…the change in vision was apparent towards the end of use. At least that was a sign that the s-4 was legit. Unwanted side effects went away when use was stopped

  20. Kirk Townsend
    5 out of 5

    Kirk Townsend

    S-4 love this great to stack with lgd, rad 140 & yk-11. Monster power stack.

  21. Avatar
    4 out of 5

    Ruben Abounaja (verified owner)

    Research concluded, great results

  22. Avatar
    5 out of 5

    Merman (verified owner)

    I have ordered this three times and it has worked every time.

  23. Avatar
    4 out of 5

    XxFaustinoxx (verified owner)

    Company has an amazing product. This helped my test subject improve, however, be careful of side effects. This cause the subjects night vision to drastically decrease.

  24. Avatar
    5 out of 5

    Scott Michael

    Great product! Works as described!

  25. Avatar
    5 out of 5

    Tampa Lifter

    Subject went from 221 lbs to 205 lbs, more muscle, felt amazing, in great shape. First 2 weeks was slow but then finally it picked up. Highly recommend.

  26. New Creation
    5 out of 5

    New Creation (verified owner)

    No yellow tint experienced., great research product.

  27. Avatar
    5 out of 5

    jayvazq (verified owner)

    Research done and I am not disappointed! Well done

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