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Description
It is a low risk vitamin without a tolerable upper intake level

If you are B12 deficient, supplementing can reduce symptoms and help you feel better

While GPCR signaling is essential, overstimulation can be deleterious, resulting in cellular toxicity or uncontrolled cellular growth

This is due to the fact that older people tend to create less stomach acid that is needed to transform vitamin B12 effectively

doi: 10.1038/jhg.2009.129

doi: 10.1208/s12249-016-0589-9
