MK-2866 side effects
Across 789 first-hand reports, people mentioned a side effect 246 times (about 31 per 100 reports). The most common: suppression, fatigue, insomnia. User reports show what people notice — they can't tell you whether MK-2866 is safe for you.
High-risk compound. Not an approved supplement; serious and sometimes irreversible risks, banned in sport, may be restricted where you live.
Reported side effects
suppression133
fatigue35
insomnia23
headache20
acne17
hair loss16
hormonal shutdown1
lowered libido1
What got worse for some people
In their own words
“All in all, great compound. Was very suprised I lost fat, as I was on a huge surplus.”
“Overall feeling on ostarine was good, but I needed a lot more sleep during the first two weeks.”
“to today repping it for 18 clean reps feeling like i could’ve done even more.”
“Helped tremendously with getting the atrophied stabilizing muscles back firing around the labrum. I can actually use my right arm much better now, with much better rom and strength.”
“Pre existing conditions (anxiety/paranoia, depression) were increased. I attempted a 2nd cycle and had to stop a week and a half in cuz i couldn’t take the sides.”
“I did 10 weeks of mk2866, strength was good didn't have massive jump 10-20 on most lifts. Mass gains not huge but noticable. No side effects as of last week.”
Is MK-2866 safe? What the research covers
DResearch: None0 meta-analyses · 0 randomized trials on PubMed
None of the top reviews we found focus on safety. All research on MK-2866.