The central metal ion is Co (cobalt)
[15] Serious but infrequent events-such as angioedema, bronchospasm, hypotension, or urticaria-reflect IgE-mediated hypersensitivity and may require desensitization or substitution with hydroxocobalamin
2 In comparison with other B vitamins, B 12 is not synthesized by animals, fungi, or plants
Older adults Vitamin B12 deficiency is Vegetarians and vegans Vitamin B12 mainly occurs in animal foods, so people who follow a plant-based diet have a In some cases, a doctor may recommend injections, but Vegetarians or vegans who are pregnant may If the infant is entirely breastfed, they may not consume enough vitamin B12
These side effects typically resolve on their own within a few hours
Even though vitamin B12 shots are most effective in those who have a deficiency in the vitamin, it is hard to know if you have a deficiency and most people will be able to experience the positive effects of regular vitamin B12 injections