A 2016 study published in Nature Scientific Reports showed that GHK-Cu had no cytotoxicity to human keratinocytes at concentrations up to 5,800 micromolar over 72 hours and did not induce inflammatory biomarkers
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Light exposure specifics Semaglutide is sensitive to UV radiation, but normal indoor lighting poses minimal risk during brief exposure periods
When you do return to exfoliation, we always recommend chemical over physical (so something like an AHA, BHA, glycolic acid, lactic acid, salicylic acid, or retinol not a scrub or scrubbing device) and go gentler than usual the first time, as your skin may be more sensitive than usual
Reported Adverse Effects Reported adverse effects from online forums cited in a 2025 systematic review (PMC12313605) included: Anxiety and panic attacks Depression and anhedonia Insomnia Heart palpitations Fatigue and weakness Loss of appetite These anecdotal reports cannot be verified as directly caused by BPC-157 versus contamination, incorrect dosing, or concurrent conditions, but they raise concerns that the peptide might paradoxically worsen mental health in some individuals