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The physiological reference range for plasma GHK-Cu in young adults is approximately 200 ng/mL, declining with age, a concentration context that informed early research designs

Honey: Moisturizes and soothes for a soft, glowing texture

[DOI] [PMC free article] [PubMed] [Google Scholar] 98.Davies MJ, Fu S, Wang H, Dean RT

doi: 10.1002/glia.22384 [DOI] [PMC free article] [PubMed] [Google Scholar] 58

One study utilized iTRAQ LC-MS/MS analysis on fetal, young, and old bovine discs to define the NP matrisome (Yee et al., 2016)

These normal ranges provide valuable information to assess whether your levels are within the expected range or if they're on the borderline