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The duration of vitamin B12 effectiveness depends on your health condition and the supplement type, and the severity of your deficiency
B12 injections are ideal for those who: Have a diagnosed B12 deficiency Dont absorb B12 well from food or supplements Need fast symptom relief If you are following a vegan or vegetarian diet (since B12 is found mostly in animal products) Your provider may recommend blood testing to confirm a deficiency and tailor a dosing schedule that fits your goals
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How long do the energy-boosting effects of a B12 shot last
For acute shoulder injuries causing significant pain, split dosing at 0.25mg twice daily may produce better results than 0.5mg once daily despite the same total amount
