The sites separate discussion of GHK-Cu in skin health and collagen synthesis covers the dermatologic evidence
Matsumoto M, Yada M, Hatakeyama S, Ishimoto H, Tanimura T, Tsuji S, et al
Lu et al
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True B12 deficiency can show up as increased shedding, brittle hair, slow regrowth, and pale or inflamed skin especially in vegans, older adults, and people on certain medications