Tendon soreness after low‑dose myostatin inhibitor – anyone else see this?

Posted by theo_benchpr in Safety & Side Effects - 1 points, 0 comments.

I started a 4‑week trial of a myostatin‑inhibitor peptide a few months ago. My plan was 100 mcg subcutaneously three times a week, rotating sites. For the first two weeks I felt a little extra “pump” and my bench numbers crept up a pound or two. By week three I noticed a dull ache in my Achilles and the tendons around my knees, especially after leg days. The pain wasn’t sharp, more of a stiffness that lingered into the next day. I switched to 50 mcg and added a rest day after heavy squats, and the soreness eased a bit, but didn’t disappear completely.

I’ve been checking my blood work – everything looks normal, no CK spikes. Has anyone experienced similar tendon stress with myostatin blockers? Should I cut the dose further or add supportive supplements? Open to any safety tips.

Community discussion - research and educational context only. Not medical advice.