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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

10.1007/s13346-023-01487-5 98 LiuG.LiuJ.ShaoP.KaiD.YangL.SunP.et al (2025)

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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