For immediate use within a brief multi-week window, maintaining temperatures between 2C and 8C is sufficient
It occurs naturally in human plasma, saliva, and urine, and its plasma concentration declines significantly with age, from approximately 200 ng/mL in young adults to much lower levels in older individuals
GHK-Cu is a copper-bound tripeptide-glycyl-L-histidyl-L-lysine chelated to a single Cu ion-extensively studied for its role in tissue repair, collagen production, wound healing, and regenerative biology

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The peptide may also support the health of brain cells by boosting important growth factors like Nerve Growth Factor (NGF) and Brain-Derived Neurotrophic Factor (BDNF) (7)