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There are four forms of vitamin B12

However, research suggests that maintaining adequate B12 levels may help with weight management by improving energy levels[2] and overall metabolic efficiency[1], particularly for those with a deficiency

Notes that high-dose niacin passes into breast milk and that lipid-altering doses could pose risks to nursing infants, recommending caution or avoidance of such doses during breastfeeding)

As you can see, there's a lot to consider when deciding between vitamin B12 injections vs pills

Compounded medications are prepared by licensed pharmacies and are not reviewed by the FDA in the same way as commercially manufactured drugs