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GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a naturally occurring copper-binding tripeptide
CRC Handbook of Chemistry and Physics , William M
Transported via PepT1 into intestinal cells, providing gut-specific anti-inflammatory effects alongside systemic NF-kB inhibition (Brzoska et al., 2007)
PeRx delivers it as a subcutaneous injection, which reaches skin, connective tissue, and hair follicles at a full therapeutic dose, not just the surface layers a topical serum can touch
Occasional digestive sensitivity or mild nausea
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