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Frias JP, Davies MJ, Rosenstock J, et al

Vitamin B12 injections can contain cobalt, which can also cause an allergic reaction

Pernicious anaemia is caused by a deficiency in vitamin B12, due to atrophic gastritis, an autoimmune condition where the immune system destroys self, in this case the parietal cells of the stomach

Published research on these studies documented outcomes from approximately 900 adult participants, predominantly individuals classified as clinically obese, though one trial included healthy non-obese volunteers

Research Guide Available , read the science, mechanism, and research data for this compound