Semax side effects
Across 667 first-hand reports, people mentioned a side effect 28 times (about 4 per 100 reports). The most common: hair loss, headache, tingling. User reports show what people notice — they can't tell you whether Semax 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
hair loss10
headache8
tingling2
mood swings2
drowsiness2
irritability2
sleep disruption1
nervousness1
What got worse for some people
In their own words
“I think Semax actually made my brainfog much worse, or the combo of that and PE-22-28.”
“It gave me a very clean awake feeling and just a slight mood boost.”
“Semax is the only thing that's worked for me for anxiety, low mood, and anhedonia... semax at this dose definitely causes headaches late in the day.”
“brainfog and problem with concentration. At first he even helped me, but after the addition of piracetam, horror began.”
“Semax worked to clear up some of the brain fog for me. Don't need to take it long term, just for a few weeks. Might worsen anxiety while you're on it though.”
“I would go to sleep with my mind turned on full blast and wake up that way, too. I had to stop using it for that reason; I never really got good sleep.”
Is Semax safe? What the research covers
CResearch: Limited0 meta-analyses · 1 randomized trials on PubMed
None of the top reviews we found focus on safety. All research on Semax.