can you take nad+ and ghk cu together GHK-Cu vs NAD+: Which Longevity Peptide Wins? Peptides for Anti-Aging and Wellness:

It is widely recognized for its involvement in extracellular matrix remodeling, collagen synthesis pathways, and tissue regeneration mechanisms

This could be a potential problem if you already have high levels of iron in your body

PMID 9562034

GHK-Cu is a human tripeptide with a wide range of biological effects, including stimulation of collagen production, wound healing, and modulation of gene expression. Pickart & Margolina, Oxidative Medicine and Cellular Longevity How GHK-Cu Works Stimulates Collagen and Elastin Production GHK-Cu promotes the synthesis of collagen, elastin, and glycosaminoglycanskey components of the skins extracellular matrix

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The stability sweet spot Research on peptide stability suggests that moderate concentrations, typically in the 1-10 mg/mL range, offer the best balance between stability and practicality