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S-4 (Andarine), 25 mg

4.68 out of 5
(140 customer reviews)




S-4 (Andarine) Research Profile:


Description: 1st gen SARM; a tried-and-true anabolic; moderate metabolic enhancements; effects often cited as a dry, hard, lean, etc.

Known for: Increasing muscle mass and hardening appearance.

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.


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

  1. 4 out of 5

    nitroteam (verified owner)

    Seems to be working very well.
    Week number two [subject] at 50 mg, 25 in the morning 25 in the evening only adverse effect is I have noticed is first thing in the morning for five maybe 10 minutes [subject has] the yellow tent in vision that everybody says is a side effect but soon seems to go away.

  2. 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. S-4 is easy on the hair but definitely helps to up the vascularity and strength by a mile.

  3. 5 out of 5

    Sean (verified owner)

    Great product for weight loss have to keep diet in check. 50 mg was on for a month and no side effect for blurry eyes. This month 75 mg a day to see if [subject] get the tint vision. Will order more when on last bottle!!!!!!!!

  4. 5 out of 5

    Michael Wilkins (verified owner)

    Third week for test subject great pumps leaned up and good muscle 💪 gains haven’t had any eye problems as of now.

  5. 4 out of 5

    Joshua Plummer (verified owner)

    Overall a good product. I think it might be a little underdosed just because iv [administered]
    s-4 in the past and [observed] side effects with vision around 75mg a day and I [administered] up to 100 on this with about the same gains as 75mg from a different source

  6. 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.

  7. 5 out of 5

    Javier Beasoain de Paulorena (verified owner)

    Gran producto, incremento notable en fuerza. Uso durante 4 semanas sin molestias visuales apreciables.

    Ha llegado a España en 10 días sin problemas. Muy bien embalado y discreto. 0 pegas con aduanas.

  8. 5 out of 5

    Jesse Miramontes (verified owner)

    Veins popping and good strength gains. Fat loss for noticable.

  9. 5 out of 5

    Jose Villafranco (verified owner)

    Used it for Research and it went GREAT !! Felt it in less then a week , honestly it went so well I’m aiming to research what the rest can do!

  10. 5 out of 5

    Tampa Lifter

    Subject saw amazing gains. Taken as part of a stack, Subject cut about 30 pounds since starting, body fat is down 7%. Muscle mass increased and strength gains through the roof. Highly recommended.

  11. 5 out of 5

    Matthew Merryman (verified owner)

    Lab subject showed increased vascularity, to the point of an ongoing pump. Notable fat loss, notable endurance and recovery. Easy on the tendons/joints, no side effects other than slight night vision difficulty. Dosing was 75mg a day for 8 weeks.

  12. 5 out of 5

    Asvp190 (verified owner)

    Great strength hardness and dryness just as advertised

  13. 4 out of 5

    Joan Barea López (verified owner)

    So far good results

  14. 5 out of 5

    jayvazq (verified owner)

    Research done and I am not disappointed! Well done

  15. 5 out of 5

    New Creation (verified owner)

    No yellow tint experienced., great research product.

  16. 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.

  17. 5 out of 5

    Scott Michael

    Great product! Works as described!

  18. 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.

  19. 5 out of 5

    Merman (verified owner)

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

  20. 4 out of 5

    Ruben Abounaja (verified owner)

    Research concluded, great results

  21. 5 out of 5

    Kirk Townsend

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

  22. 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

  23. 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

  24. 5 out of 5

    Cerosa (verified owner)

    Excellent product. Good results.

  25. 5 out of 5

    jayvazq (verified owner)

    Research subject made substantial progress with strength and muscle mass

  26. 5 out of 5

    Kevin (verified owner)


  27. 5 out of 5

    Marc S. (verified owner)

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

  28. 5 out of 5

    Nelson Reyes (verified owner)

    Hardens muscles and builds a solid foundation

  29. 5 out of 5

    Raymond (verified owner)


  30. 4 out of 5

    Tim (verified owner)

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

  31. 5 out of 5

    Stepfon (verified owner)

    100% legit, 100% reco

  32. 5 out of 5

    Mike (verified owner)


  33. 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..

  34. 5 out of 5

    Matt (verified owner)


  35. 5 out of 5

    Anonymous (verified owner)

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

  36. 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.

  37. 5 out of 5

    John (verified owner)

    Excellent product but comes with vision side effects.

  38. 5 out of 5

    Steve Whalin (verified owner)


  39. 4 out of 5

    Anonymous (verified owner)


  40. 4 out of 5

    Scott B. (verified owner)

    Research concluded! Good results

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S-4 Andarine SARM Capsules
S-4 (Andarine), 25 mg