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The thioredoxin reductase (TXN) system, alongside system Xc GPX4-GSH, plays a critical role in antioxidant defence [76, 77]

B12 supplements are typically present in the cyanocobalamin form, which must be converted in the body to active-B12, methylcobalamin and 5-deoxyadenosylcobalamin

The pKa of superoxide is 4.8, so at pH 8 the concentration of protonated superoxide [HO 2 ] = 6.3 10 4 [O 2 ]
In people over 40, levels slowly decline

Multi-dose format (preserved)
