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It can decrease melanin production, which reduces the appearance of dark circles and evens your skin tone

10.1038/s41467-020-16145-4

Often, the cause is much simpler and frequently overlooked: a Vitamin B12 deficiency

Smeyne M, Smeyne RJ (2013) Glutathione metabolism and Parkinsons disease

GSH is found in almost all bacterial, plant, and mammalian cells in high concentration, typically 0.512 mmol l 1 (Stevens and Jones, 1989, Taniguchi et al., 1989)
