Description
What is YK11?
YK11 is a steroidal myostatin inhibitor and partial androgen receptor agonist with a unique dual mechanism. As a myostatin inhibitor, it induces follistatin expression — blocking myostatin’s (GDF-8) anti-anabolic activity. As a partial AR agonist, it contributes anabolic gene activation. This dual-action profile makes YK11 a distinctive research compound for myostatin biology, muscle growth regulation, and SARM-adjacent pharmacology. Research use only.
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