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The peptide has also been investigated as a regulator of the sleep cycle, as it increases levels of melatonin and endogenous gonadotropic hormones (FSG, LG, prolactin), which play a role in reproductive function but naturally decline with age [8]
A 12-week facial study on 67 women indicated that GHK-Cu cream applied twice daily improved aged skin appearance, increased thickness, reduced wrinkles and strongly stimulated dermal keratinocyte proliferation as determined by histological analysis of biopsies
Cyanocobalamin is more common because it works well and stays stable
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