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Benef Microbes 16, 667684

A peptide is a string of amino acids

Perhaps most relevant to our pursuit of beauty, a lack of glutathione is also associated with the aging process in general

While topical application has minimal systemic absorption, the precautionary principle suggests avoiding use during pregnancy unless a healthcare provider approves

Studies, like this 1992 study, have shown that muscle fatigue can be delayed by boosting glutathione levels.

That is a genetic-knockdown study in mice, not a drug trial: it tells you the target is real and metabolically meaningful in an animal model, but it does not test a drug, a dose, or a route