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Given as an injection or IV drip it reaches your bloodstream directly, so far more of it is usable than from a swallowed pill

Glutathione is a required substrate for a family of enzymes called glutathione S-transferases, which conjugate glutathione to reactive compounds including drug metabolites and environmental toxins making them water-soluble for excretion

Once reconstituted in sterile water or buffer, store at 4 C for short-term use (up to one week) or aliquot and freeze at -80 C to minimize copper dissociation and peptide degradation

Cheng, Jin-Pei

This means IV administration delivers more active glutathione into the bloodstream, typically producing faster and more consistent results

Aging 33 , 22252228 (2012)