vitamin b12 supplements vs injections shots: Uses, benefits, and side effects b12 deficiency injection treatment The

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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

With an oral supplement, the B12 needs to be absorbed through your digestive system first before getting to your blood, which takes a lot longer