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The researchers didnt feed glutathione to the yeast, but rather used evolutionary engineering to produce a specific strain that tends to produce more glutathione, as well as a glutathione-derived metal chelating compound called PC2 (phytochelatin 2)

Vitamin D Table 4 shows that nine of the 15 vitamin D studies reported beneficial effects on improving depression symptoms

doi: 10.1126/science.282.5391.1145 192 TomiokaT.MaruokaH.KawaH.YamazoeR.FujikiD.ShimokeK.et al

Eur J Med Genet 1(71):104962 Maruo Y, Nakahara S, Yanagi T, Nomura A, Mimura Y, Matsui K et al (2016) Genotype of UGT1A1 and phenotype correlation between CriglerNajjar syndrome type II and Gilbert syndrome

Vitamin C Support Vitamin C makes glutathione more effective by maximizing its activity and concentration

One in vitro study appears to suggest the half-life of DSIP to be around 15 minutes, while animal studies suggest 4-5 minutes