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While glutathione itself crosses this barrier poorly, the brain can synthesize glutathione from precursor amino acids, and systemic glutathione elevation may indirectly support brain glutathione status through various mechanisms including reduced oxidative stress on blood-brain barrier integrity and improved availability of glutathione precursors

PMID 12535396

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For instance, a patient on a peptide protocol for general aging might receive GHK-Cu along with other peptides via injections or IV drips

Short answer: Bacteriostatic water contains benzyl alcohol and is intended for multi-use because it helps prevent bacterial growth in vials accessed repeatedly