glutathione structure elucidation What Is Made Of? The Master Antioxidant Unveiled – Route2Health Glutathione - Wikipedia
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While necessary for structural purposes, these strong linkages between cysteine residues render keratin indigestible to humans and thus unavailable for absorption

Depletion and other background things as you mention are possible, as well as the B-Vits triggering some detox that has been waiting

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Lv et al., 2013)
