side effects of injection vitamin b12 What Are Shots? 5 Benefits and B12 Injection Side Effects -

When your levels are low, you might be tired even after resting

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- B complex injections can slightly sting during the injection, this is normal and the sensation should subside shortly after the injection is completed

Mecobalamin - NCI Drug Dictionary [Internet]

The main causes of a vitamin B12 deficiency are as follows: Malabsorption due to poor intestinal health (inflammation, bacteria, fungal infection, parasites, disturbed intestinal flora) due to a lack of transport molecules (intrinsic factor), genetic diseases (cobalamin disease) or medications that hinder uptake