glutathione same as glutamine synthesis from glycine and glutamine; 'retro-control' by Glutamine vs Glutathione - What's

While the body does produce its own glutathione, levels may decrease due to aging, stress, poor diet, or environmental exposure

Native peptide drugs, however, are generally ineffective when given orally due to low oral bioavailability, which is as a result of the physical and biochemical barriers of the gastrointestinal tract (GIT), often forcing the use of invasive parental delivery methods that lead to low patient compliance [3,4]

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10.1002/mnfr.202200160 101 TianX.LiangT.LiuY.DingG.ZhangF.MaZ

These antigens are found in significantly higher amounts in the peripheral blood of patients vs healthy individuals