Compound Library

SARM / Myostatin Inhibitor

YK-11 (Myostatin Inhibitor)

Myostatin inhibitor AND partial androgen receptor agonist. Among the most potent SARMs. Very limited human research. Hepatotoxic in case reports. Least studied SARM.

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Educational reference only. This page does not diagnose, prescribe, or replace care from a licensed professional. Laws, availability, and clinical appropriateness vary by location.
Reference dose5–15 mg/day. Maximum 8 weeks.
Half-life12 hours
Risk flaghigh
Regulatory noteResearch-only flag

Side effects and watch-outs

  • ⚠️ Liver toxicity (hepatotoxic — LFTs every 2 weeks mandatory)
  • Significant HPTA suppression — PCT required
  • Joint pain
  • Acne
  • Hair loss
  • Aggression
  • ⚠️ Least studied SARM — long-term safety completely unknown