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doi: 10.1007/s10787-010-0045-5

Those precursor amino acids cysteine, glutamic acid, and glycine needed for Glutathione synthesis are less readily available as we age

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The body possesses remarkable adaptability, and receptor sensitivity can decrease with prolonged continuous stimulation

Nature 432: 332337 [DOI] [PMC free article] [PubMed] [Google Scholar] Birchmeier C., Birchmeier W., Gherardi E., Vande Woude G.F

rarely, injection-site irritation or allergic reactions could occur