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IV therapy or a consultation may be better if your goals are broader, your symptoms are complex, or you want a more comprehensive inside-out strategy

It is also important to consult with a healthcare provider before starting B12 shots, especially for those on medications that may interfere with B12 absorption or metabolism

The commonly used method is high-performance liquid chromatography, supplemented by other validation methods, as detailed below

Vegetarians, vegans, and people who eat little animal protein may fall short

"[Associations between insulin resistance and three B-vitamins in European adolescents: the HELENA study]"