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when do b12 injections start to work How Fast Does a Vitamin Shot Work? Vitamin B12 Injection Dosage |
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Do not use folic acid instead of vitamin B12

When youre trying to lose weight, these shots deliver the energy you need to stick with your diet and get the right level of exercise

Science 352:14361443

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You should see your healthcare provider to determine whether vitamin B12 is right for you