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Vitamin B12 supports several important functions in the body, including: DNA synthesis Red blood cell production Nervous system function Myelin production, which helps protect nerves Energy metabolism Vitamin B12 absorption becomes more difficult with age because the body may produce less intrinsic factor, a stomach protein required for proper absorption

Very rarely, more serious reactions can occur, such as a severe allergic reaction

For individuals with digestive sensitivities, those taking acid-reflux medications, or anyone on a plant-based (vegan/vegetarian) diet, absorbing enough B12 through food or pills is virtually impossible

The result is a slow, progressive B12 shortfall even when dietary intake is adequate