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At a glance: RDA: 2.4 mcg/day (adults) UL: Not established (insufficient evidence to set a tolerable upper limit) [ref] Dietary considerations: Vegan and vegetarian diets: Vitamin B12 is only found in animal-based foods, so vegans and vegetarians are often deficient or marginal in their B12 status.[ref] B12 is often added to breakfast cereals and other refined products, so eating a vegetarian diet that includes packaged and refined foods may actually result in higher B12 levels (although probably not in better health)

J., Guichelaar, L

Sources: Healthline

Potential measurements include: Reactive oxygen species Lipid-peroxidation markers Protein-oxidation markers DNA-damage variables Antioxidant-enzyme expression Redox-sensitive signaling Mitochondrial measurements Cell viability A reduction in one oxidative marker does not establish antioxidant protection or a health benefit

B12 supports methylation, a metabolic process which has many actions in the body but helps to produce energy

It also functions as a precursor to glutathione peroxidase, a key antioxidant enzyme, which protects against lipid peroxidation (fats turning rancid).* 1 tablet daily