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Vitamin B12 promotes brain health through its role in the production of neurotransmitters (specific chemicals in our nervous system) and myelin, the protective membrane around nerves

There are many people who are vitamin B12 deficient, so this is not a problem which is singling you out

It is not approved for human or veterinary diagnostic, therapeutic, or recreational use

The FASEB Journal 4 (5): 14501459

And if you need to take a supplement that is causing constipation, ask a doctor whether a laxative or stool softener might help manage it