GW-501516 side effects
Across 418 first-hand reports, people mentioned a side effect 19 times (about 5 per 100 reports). The most common: cancer risk, acne, brain fog. User reports show what people notice — they can't tell you whether GW-501516 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
cancer risk10
acne3
brain fog2
insomnia2
carcinogenic2
What got worse for some people
In their own words
“I did a 6-week cycle of apparently fake Ostarine and Cardarine in November 2022. It gave me increased anxiety that does not go away and insomnia.”
“I felt day 1 and I don’t think it was placebo. I’ve had to force myself to leave the gym after an hour of lifting and 30 min of cardio.”
“After a few days noticed I had a real problem with falling asleep and my quality of sleep was poor.”
“For me it didn't do anything on my cholesterol. Used 20mg per day for 10 weeks.”
“Day 2:Already felt the cardio effect... I was able to go 1000 feet non stop in 5:50, my usual time is 7:30”
“didn't realise this could help me with my shit mood and emotions”
Is GW-501516 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 GW-501516.