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Collagen Synthesis Collagen is a protein that provides structure and elasticity to the skin

GHK-Cu gene modulation research was conducted at concentrations achievable with consistent nasal delivery

Last reviewed: May 31, 2026 Last updated: May 31, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations

Neither is universally better

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