does glutathione reduce cancer risk Study Finds Cells Use as Fuel to Drive Growth How Does Glutathione Affect Cancer
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(And vitamin D, but that is a topic for another day)

A 2013 study showed that those given a vitamin E supplement had increased blood levels of glutathione compared to those who took a placebo

Singh et al., 2005)

Unfortunately, these potential confounders were not controlled in the participants of previous clinical trials
PMID 14767299