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One potential reason for the observed publication bias is that only English articles were included, which is a limitation for this study

4 Supplementation with GSH or cysteinylglycine rescues cancer cells in cystine-free conditions

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doi:10.1016/S0753-3322(03)00043-X Nicolson GL

For the US, FDA regulations for dietary supplements (21 CFR Part 111) or cosmetics apply, requiring GMP, proper labeling, and substantiation of claims