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These can include dry skin, higher risk of skin infections, and (ironically) hyperpigmentation, i.e., increased skin darkening

With higher potency and a better breakdown resistance, the second generation of copper peptides followed their predecessors, coming out in the early 1990s

As we age, the concentration of GHK-Cu in our body declines significantly

J Immunotoxicol

Peter Attia, a longevity physician, discusses NAD+ precursors: "While evidence is emerging, NAD+ boosting shows promise for mitochondrial health and longevity, though IV might not be optimalprecursors like NMN could be better."[33][20] On combinations, he cautions on long-term data but notes potential for metabolic disorders