can you take metformin with b12 injections long-term use cause vitamin deficiency? Metformin & Vitamin B12 Deficiency:
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Updated on Are B12 injections painful

These injections contain high levels of nutrients, such as B12, methionine, inositol, and choline, often far above everyday dietary needs, which may pose unknown risks
Pregnancy Parenteral methylcobalamin is classified as pregnancy category C