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If youre relying on getting all your B12 from fortified foods, make sure you get at least one serving at each meal containing at least 190% of the Daily Value listed on the nutrition facts label (based on the new labeling mandated to start January 1, 2020the target is 4.5 mcg three times a day)

B12 shots deliver a concentrated amount of cobalamin, a water-soluble vitamin essential for red blood cell formation, neurological function, and DNA synthesis, as detailed in the NIH fact sheet on vitamin B12

They won't fix a bad diet, replace sleep, or erase metabolic dysfunction overnight

It supports the growth of neurons and also the myelin sheath that surrounds and insulates nerves (including within the brain and spinal cord)