GHK Cu is a naturally occurring tripeptide in human plasma. Levels average 200 ng ml at age 20 and drop to 80 ng ml by age 60 (Pickart et al., 2020). That decline tracks with Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with Advanced GHK Cu Neck & Face Serum Premium Quality Neurogan Health GHK CU Beverly Hills Rejuvenation Center GHK Cu Peptide: Mechanism, Anti Aging Research, and Regenerative Benefits
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