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In the second step, glutathione synthetase (GS), covalently adds the glycine to the -glutamyl-cysteine to produce glutathione

Nature 481 , 385388 (2011)

Sensitivity of KRAS mutant colorectal cancers to combination therapy that co-targets MEK and CDK4/6

Immunotec Immunocal Glutathione Precursor Immunotec Immunocal Glutathione Precursor Immunocal , is an all-natural protein with the highest biological value of any edible protein, and clinically proven to raise glutathione levels.* Glutathione enhances your immune system, is a key detoxification enzyme, provides cellular energy and acts as your bodys master antioxidant

Ann NY Acad Sci 973:488504 Farid A, Shah AH, Ayaz M, Amin A (2012) Comparative study of biological activity of glutathione, sodium tungstate and glutathione-tungstate mixture