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Researchers have examined the peptides relationship to fibroblast activity the cells responsible for producing structural proteins in skin and connective tissue as well as its role in glycosaminoglycan and proteoglycan production, both of which are components researchers study in the context of tissue structure and repair

10.1016/j.copbio.2012.08.005 [DOI] [PubMed] [Google Scholar] McGuire S

Roles of Vitamin C in the Eye In humans, high concentrations of vitamin C exist in the aqueous and vitreous humor exceeding plasma concentrations by as much as 20- to 70-fold [9]

However, clinical trials evaluating these effects in humans treated with NAD+ injection have not yet been published

Biomed J