lump under skin from b12 injection site Common & Rare Side Effects of Vitamin Injections Managing Vaccine Injection Site Reactions:
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If we look at different studies, however, we can see that injecting hydroxocobalamin has not been proven to be more effective in treating B12 deficiency than ingesting oral tablets available over the counter

The good news is that Vitamin B12 shots provide a direct way to raise your levels and help you get back to feeling like yourself

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Generally, when treating a B-12 deficiency, youll get a 1,000-microgram shot every day or two for the first week (2)