Homocysteine and methionine are key amino acids with a vital connection to glutathione one of your body's most important substances! Methionine is abundant in many foods, so protein isn't the culprit, Short term sleep deprivation leads to decreased systemic redox metabolites and altered epigenetic status PLOS One Homocysitaconate controls inflammation through reshaping methionine metabolism and N homocysteinylation: Cell Metabolism Glutathione Metabolism in Yeasts and Construction of the Advanced Producers of This Tripeptide Springer Nature Link