The source data identify both improved skin elasticity, collagen production, and pigmentation correction as well as increased hair growth and follicle size as documented benefits, making GHK-Cu one of the more versatile peptides for age-related changes in skin and hair
The distinction also protects against overgeneralizing from a bulk-substance review
Some patients likely saw dramatic improvement while others saw less
Wound Healing, Skin Repair, and Regeneration Research A multicenter, randomized, evaluator-blinded, placebo-controlled study in diabetic neuropathic ulcers reported greater median plantar-ulcer closure with topical glycyl-L-histidyl-L-lysine copper gel compared with vehicle, 98.5% versus 60.8%, and lower ulcer infection incidence, 7% versus 34% [3]
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