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YK-11 Myostatin Inhibitor, 5 mg

4.71 out of 5
(201 customer reviews)


SKU: YK11-5MG Category: Tags: , , , ,


YK-11 (Myostatin Inhibitor) Research Profile:

dependent on stack
dependent on stack
dependent on stack
dependent on stack

Description: Myostatin inhibitor -- reduces the body's natural limitations on muscle-growth imposed by naturally-occurring myostatin protein in mammals; often ran concurrently with any SARM or Prohormone.

Known for: Muscle mass increases by inhibiting myostatin.

Commonly stacked with: Typical bulking stack: YK-11, MK-677 and RAD-140/or/LGD-4/or/S-4/or/S-23 | optional: MK-2866

Side-effects: Very few reports of adverse side-effects


YK-11 (Myostatin Inhibitor) Chemical Profile:

Clinical data

Selective Androgen Receptor Modulator, Myostatin Inhibitor
YK-11, YK11, (17α,20E)-17,20-[(1-methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna-4,20-diene-21-carboxylic acid methyl ester
By mouth
US: Investigational New Drug
Excenen Pharmatech, ChemIDplus

Pharmacokinetic data

6-10 hours


Methyl (2E)-2-[(8R,9S,10R,13S,14S,17S)-2'-methoxy-2', 13-dimethyl-3-oxospiro[1,2,6,7,8,9,10,11,12,14,15, 16-dodecahydrocyclopenta[a]phenanthrene -17,5'-1,3-dioxolane]-4'-ylidene]acetate

Chemical and physical data

430.54 g/mol
C[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@@]24/C(=C\ C(=O)OC)/OC(O4)(C)OC)CCC5=CC(=O)CC[C@H]35
1S/C25H34O6/c1-23-11-9-18-17-8-6-16(26) 13-15(17)5-7-19(18)20(23)10-12-25(23)21(14-22(27) 28-3)30-24(2,29-4)31-25/h13-14,17-20H,5-12H2,1- 4H3/b21-14+/t17-,18+,19+,20-,23-,24?,25+/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.


201 reviews for YK-11 Myostatin Inhibitor, 5 mg

  1. 4 out of 5

    Chris (verified owner)

    Didn’t notice a whole lot of growth but I also didn’t waste away either. I experienced better results with LGD but that may be due to the longer cycle.

  2. 4 out of 5

    Contender (verified owner)

    Effective combined with Rad140

  3. 5 out of 5

    Alex Kosinski (verified owner)


  4. 3 out of 5

    Anonymous (verified owner)

    Seemed to increase hunger

  5. 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!

  6. 5 out of 5

    Carter T (verified owner)

    7.5 weeks and up 12lb lean and dry. Real deal. Stack with MK2866 for joint support.

  7. 5 out of 5

    Eddie Noblet (verified owner)

    good strength gains and size

  8. 5 out of 5

    Eddie Noblet (verified owner)

    This product had the best results of today on my test subject. I will definitely use this again!

  9. 5 out of 5

    Eddie Noblet (verified owner)

    Used this product on my test subject along with 4033 and let me tell you… he got mad strong and major gains and stayed pretty lean so I will without a doubt be running this on him again! Try it you won’t be sorry!!

  10. 5 out of 5

    Anonymous (verified owner)

    Research subject experienced nice gains, no noticeable sides

  11. 5 out of 5

    Julien Marion (verified owner)


  12. 4 out of 5

    Kenneth G. (verified owner)

    Test subject noticed increases in energy. And some change to physique. Overall a good inhibitor.

  13. 5 out of 5

    Nicholas Q. (verified owner)


  14. 4 out of 5

    Omar Thomas (verified owner)


  15. 5 out of 5

    Cedric (verified owner)

    Yk11 is amazing!! 2 pills a day and subject is still growing with hard gains viens are starting to show like crazy

  16. 5 out of 5

    Nicholas F. (verified owner)

    This product alone has grown my test subject substantially in a short time. Amazing product! And as usual sarmtech delivers the best

  17. 5 out of 5

    Faure J. (verified owner)


  18. 5 out of 5

    Anonymous (verified owner)


  19. 3 out of 5

    scott lemaster (verified owner)


  20. 5 out of 5

    Isidro A. (verified owner)

    Worked well

  21. 5 out of 5

    Omar Colon (verified owner)


  22. 4 out of 5

    Anonymous (verified owner)


  23. 5 out of 5

    Jihad Green (verified owner)


  24. 4 out of 5

    Anonymous (verified owner)


  25. 5 out of 5

    Anonymous (verified owner)


  26. 5 out of 5

    Anonymous (verified owner)


  27. 3 out of 5

    Peter Nyren (verified owner)

    Solid strength gains noted in test subject, however very noticeable increase in aggression and temperament. Trouble with sleep and maintaining positive attitude/motivation. Effects subsided after approx 3-5 days from ending cycle.

  28. 3 out of 5

    Michael PEREIRA (verified owner)

    I noticed a big strength & muscular endurance increase right away. Downside is YK11 gives me headaches after the 3rd day on a cycle & I have a real hard time sleeping.

  29. 5 out of 5

    Housam Rasshad (verified owner)


  30. 5 out of 5

    Eric G. (verified owner)


  31. 5 out of 5

    Eric G. (verified owner)

    Worked great stacked with RAD140, impressive muscle hardness and noted improvement in strength.

  32. 5 out of 5

    Isidro (verified owner)

    Research subject experienced strength gains and size after 2 and half weeks, and is harder, fuller and denser. Subject is doing a twelve week cycle. Starting weight 155lbs and current weight 180lbs. Height is 5,7. Goal is to bulk first 8 weeks and 4 weeks to lean out/recomp. Only sides water retention and lack of sleep. Subject cut down on sugar, sodium. Subject stacked Rad140,LGD4033,MK677,YK11 low dosage.

  33. 4 out of 5

    Matthew D. (verified owner)

    Fast gains, stacked with RAD-140

  34. 5 out of 5

    Fahed abdelqader (verified owner)


  35. 5 out of 5

    Andrew S. (verified owner)

    Great costumer service and delivery time as promised definitely legit and great prices. Subject had great recovery time and gains, put 10 pounds on in 60 days definitely going to be a repeat costumer

  36. 5 out of 5

    MARK CASTRO (verified owner)

    Just as described

  37. 5 out of 5

    Fred (verified owner)

    Definitely can tell it works

  38. 4 out of 5

    James K. (verified owner)

    Definitely can tell it’s working

  39. 4 out of 5

    Anthony B. (verified owner)

    It is the real deal, works well to get your research pass plateaus.

  40. 5 out of 5

    Carolyn V. (verified owner)


  41. 5 out of 5

    Carolyn V. (verified owner)


  42. 5 out of 5

    alan cucchiella (verified owner)

    Great gains

  43. 4 out of 5

    steve s. (verified owner)

    Good strength gains

  44. 5 out of 5

    Serge K. (verified owner)

    Feel more energetic!

  45. 5 out of 5

    Aly Lizza (verified owner)

    Most powerful of all Sarms becareful with dosage.

  46. 5 out of 5

    Anonymous (verified owner)


  47. 4 out of 5

    Anonymous (verified owner)

    Après 8 semaine, une bonne récupération de nuit, vu la différence

  48. 5 out of 5

    Anonymous (verified owner)

    Subject will deffinatly keep taking these !

  49. 5 out of 5

    Anonymous (verified owner)

    Excellent product!!!!

  50. 5 out of 5

    Anonymous (verified owner)


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