It is found and made in every cell of the body, but occurs in higher concentrations in the heart, muscle tissue and liver
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Glutathione for Food and Health Applications with Emphasis on Extraction, Identification, and Quantification Methods: A Review
doi: 10.1016/j.conb.2021.07.007 168 MorrisG
It is naturally produced by the liver and comprises the amino acids cysteine, glycine, and glutamine