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Vitamin B12 (cobalamin) participates in several fundamental cellular mechanisms: Methylation pathways cofactor for methionine synthase, influencing DNA methylation and homocysteine metabolism

They usually attach to each other or associate with nearby proteins, such as integrins, to form a tetraspanin membrane domain (Farooqi et al., 2018)

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Influence of N-Acetylcysteine Supplementation on Physical Performance and Laboratory Biomarkers in Adult Males: A Systematic Review of Controlled Trials

Injections send B12 straight to the bloodstream, making them more potent and longer-lasting when compared to oral supplements

However, if you are looking to cut to the chase and cut out the processes your body requires to convert the NAC to glutathione, then glutathione wins the NAC vs glutathione choice