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Published research reports that GHK levels are approximately 200 ng/mL around age 20 and decline to approximately 80 ng/mL by age 60

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For each included study, the following information was collected: first authors name, year of publication, country of origin, type of study (in vitro, in vivo, or clinical), characteristics of the experimental model (e.g., species, sample size), specific platelet-derived product used (PRP, PRGF, PRF, or PRPL), details of preparation protocols, route and frequency of administration, and main outcome measures

Effects of grape seed proanthocyanidin extract on vascular endothelial function in participants with prehypertension: a randomized, double-blind, placebo-controlled study