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YK-11, 300 mg (5 mg/ 60 capsules)


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  • Chemical Formula: C25H3406
  • Molecular Mass: 430.541 
  • Synonyms: YK11; (17α,20E)-17,20-[(1-methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna-4,20-diene-21-carboxylic acid methyl ester
  • Molar Mass: 430.541
  • CAS Number: 1370003-76-1
  • PubChem: 119058028
  • Total Amount of the Active Ingredient: 5mg/60 capsules
  • Shelf Life: 36 months



  • YK-11 is a synthetic steroidal selective androgen receptor modulator (SARM). It does not induce the physical interaction between the NTD/AF1 and LBD/AF2. Overall, many animal research have examined YK-11. In a 2013 Biological and Pharmaceutical Bulletin study, YK-11 increased muscular mass and strength in mice without harming the liver or other organs.


Product Quality

All of our products are lab tested and the results are occasionally published on the website.

You can have the product you bought from us tested at any HPLC-licensed testing facility and if the results are negative, we will refund the following:

  • Cost of HPLC test
  • Total amount of the order + shipping fee

All of our products are lab tested and the results are periodically published on the website.


Peer-Reviewed Studies 

Gamma-Butyrolactone, G. B. L.

Yatsu, T., Kusakabe, T., Kato, K., Inouye, Y., Nemoto, K., & Kanno, Y. (2018)

Biological and Pharmaceutical Bulletin, 41(3), 394-398.

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