half life of b12 injection How Long Do Vitamin Injections Stay In the Body? ARE THERE ANY RISK FACTORS FOR DEVELOPING A B12 DEFICIENCY Oral vs. Intramuscular Vitamin B12
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By the way, have you suffered from acne

Endocr Dev

You might explore options that combine B12 with other beneficial elements

Amounts of vitamin B 12 that are recommended by the Food and Nutrition Board, National Academy of Science-National Research Council for pregnant women (4 mcg daily) should be consumed during pregnancy

de Luca C, Olefsky JM

The precautionary principle underpins the SmPC statements that these medications should not be used during breast-feeding
