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The active forms of vitamin B12, methylcobalamin or 5-adenosyl-5-cobalamin, can each enter their respective biochemical cycles in the human body without prior change when administered to patients with vitamin B12 deficiency if they reach the tissues
Vitamin C (ascorbic acid) is itself a potent water-soluble antioxidant, and just as importantly, it helps regenerate oxidised glutathione back into its active form
More information is needed to understand its full effects on the body
doi: 10.1038/288715a0
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