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The antioxidant function of GSH is determined by the redox-active thiol (-SH) of cysteine that becomes oxidized when GSH reduces target molecules (Pompella et al., 2003)
A tablet cannot replace an injection if your body physically cannot absorb B12 from your gut (e.g., in pernicious anaemia)
What it does offer is consistent, systemic support that may help the body adapt more efficiently to physical, digestive, and inflammatory stressors over time
Oral absorption in humans is unproven, but animal studies suggest possible systemic effects even with oral dosing6
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