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Factors That Affect How Long B12 Injections Last Several factors may influence how long the effects of a B12 injection last in your system, potentially explaining why some patients require more frequent injections than others, even with the same underlying condition

As part of our comprehensive approach to health and wellness, we can evaluate if you are a potential candidate for Vitamin B12 injections

In very rare cases, allergic reactions like itching or swelling may occur

Guilherme A, Pedersen DJ, Henchey E, Henriques FS, Danai LV, Shen Y, et al

However, since this is a single study, more research is required in this field (5)