glutathione amino acid composition Frontiers | Glutathione: A Samsonian
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The tradeoff versus injection is bioavailability

I thought B12 was supposed to help with energy/perkiness

Ackerman AL, Jackson NJ, Caron AT, Kaufman MR, Routh JC, Lowder JL

Irinotecan disrupts tight junction proteins within the gut: implications for chemotherapy-induced gut toxicity

The better version is methylb12 or methylcobalmin
Rabenstein DL & Isab AA (1982) A proton nuclear magnetic resonance study of the interaction of mercury with intact human erythrocytes
