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YK11 (Myostine) is a research compound often described as a selective androgen receptor modulator (SARM), though its classification is debated.
It shows partial androgen receptor activity and has been studied in vitro for potential muscle-building effects. Early research suggests it may influence pathways related to muscle growth, including possible effects on myostatin and follistatin, but human data is very limited, and it's safety and effectiveness are not well established.