Although there are 4 types of Vitamin B12, most of what is used by the body is the methyl form of Vitamin B12
However, in some people, there are transient side effects such as minor swelling and bruising, that may make certain activities less comfortable

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When you say it doesn't prove you cant utilise b12 from.stores in the liver what does it prove if symptoms return then relieved by a b12 injection then
Only individuals who have a prescription from a healthcare professional should take Vitamin B12 injections