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how to give b12 injection Self-Inject Choosing the Right Needle and
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Some medical conditions may also increase the risk of deficiency
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The best practice is to reconstitute the vial, store it in the fridge, and draw your required doses from it until it's used up
Li X, Wang Y, Yang Q, Song L, Kang L, Hu Z, et al

Its used to treat deficiencies in both vitamins at once