An allergic reaction could cause symptoms, including ( rashes redness swelling anaphylaxis Whats more, though low vitamin B12 levels can have detrimental effects on newborns, it appears that high levels of the vitamin can as well
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How long is the B12 injection course
[99] A person with cobalamin C disease, a rare autosomal, recessive, inheritance disease which results in combined methylmalonic aciduria and homocystinuria), [100] can be treated with intravenous or intramuscular hydroxocobalamin
So, while an elderly person might truly need a supplement, it doesnt mean they should start taking high doses every day