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The levels of OS markers, including protein carbonyls, 4-hydroxy-2-non-enal (HNE), 3-nitrotyrosine (3-NT), and 8-OHdG, are increased in the blood and cerebrospinal fluid of patients with AD (172, 173)

Zhong L, et al

This can be done through a balanced diet that includes foods rich in glutathione or its precursors

Whats more, according to Paulings calculations, the amount of vitamin C modern humans were eating was only the bare minimum needed to prevent scurvy but not enough to realize the full health benefits of vitamin C

A safety survey 3 of intranasal glutathione highlighted the mild side effects, including irritation of nasal passages and headaches