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Vitamin C 1,000 mg An antioxidant involved in normal collagen production and cellular protection from oxidative stress

That matches the standard titration period before increasing to 5mg

[DOI] [PMC free article] [PubMed] [Google Scholar] 162.Grant C., Rahman F., Piekarz R., Peer C., Frye R., Robey R.W., Gardner E.R., Figg W.D., Bates S.E

Blankenberg S, Rupprecht HJ, Bickel C, Torzewski M, Hafner G, Tiret L, Lackner KJ

It gives a young look to the skin

In addition, a lower intake of vitamin B12 seemed to be associated with a delayed sleepwake rhythm [28] and a higher prevalence of insomnia symptoms, assessed by the Insomnia Screening Questionnaire [36]