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It's produced naturally in the liver and plays a central role in repairing tissue, supporting the immune system, helping the body process and eliminate toxins, and brightening skin from within

Journal of Investigative Dermatology

Niacinamide helps regulate excess sebum production without drying the skin, helping balance oil while supporting the skin barrier

The honest summary is therefore: mechanistically rich, preclinically supported (but not uniformly) for tissue repair in animals, and clinically unproven in humans

[DOI] [PubMed] [Google Scholar] 138.Tlak Gajger I., Smodi kerl M.I., otari P., uran J., Sikiri P., Vlaini J

Int J Androl 13:1725