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Tripeptides such as GHK-Cu have an established safety record in topical and cosmetic applications, showing low cytotoxicity and reduced skin irritation compared with other copper compounds, and acceptable tolerability in clinical cosmetic studies [23, 74, 93]
Post-marketing surveillance of approved drugs involves millions of users over years, and often reveals rare side effects that clinical trials miss
TNSS: Total Nasal Symptom Score
12 to 15 min, sustaining 98% of Phase A
PubMed Central , Clinical and Experimental Pharmacology & Physiology , vol
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