Gastrointestinal issues

Vitamin B-12 may have a role in other aspects of human health, such as the composition and function of the gastrointestinal (gut) microbiome, according to some studies. Vitamin B-12 is necessary for over a dozen enzymes in bacteria and is synthesized and used by bacteria in the human gut microbiome.

Diarrhea, nausea, constipation, bloating, gas, and other gastrointestinal symptoms can all be signs of a B12 deficiency. Both adults and children might be affected by these issues. However, keep in mind that many of these symptoms are non-specific and might be caused by a variety of different things. Food intolerances, medications, and infections, for example, can all cause diarrhea.