vitamin b12 tablets or injection which is better Treatment are b12 tablets better than

Neomycin, colchicine, para-aminosalicylic acid, or excessive alcohol intake longer than two weeks may cause malabsorption of vitamin B12. Chloramphenicol and other drugs having bone marrow suppressant properties may cause a lack of therapeutic response to vitamin B12

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"Guidelines for the diagnosis and treatment of cobalamin and folate disorders"

In other words, it can break down through photolysis (destruction by light) unless you store it properly