Why do you want the B12 shot? Are you deficient, or are you anticipating that it will help you lose weight? The reason I ask, is because a lot of people think vitamin B12 is a weight loss aid. It is not. I have pernicious anemia (B12 deficiency) and take shots weekly. I have been on them for over 3 yrs and trust me, they do nothing to help with weight loss. If you are deficient, however, B12 shots will help give you energy.
Injectable vitamin B12 requires a prescription, which you would have to get from your doctor. Since B12 is a water soluble vitamin, it should not affect breast feeding or your baby; however, for both your baby's protection and your own, I would never suggest beginning a new vitamin without following your doctor's orders.
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