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Many well-formulated copper peptide scalp serums include both, because they address complementary aspects of the follicle environment: GHK-Cu maintains the surrounding scalp tissue

(8) Nitric oxide helps induce several physiological functions, such as vasodilation, blood flow regulation, increasing glucose uptake, and increasing muscle contractions

Collagen-derived tripeptides (CTP) have demonstrated vascular-protective properties in preclinical models and early human investigations, where they enhanced endothelial resilience under oxidative stress and attenuated vascular inflammation

These are specifically from the Life Extension brand and focus much more on potential health benefits than other supplement companies that also sell diet products