can i have b12 injections while pregnant Vitamin in Pregnancy: What You Need to Know – NaturoBest Vitamin B12: Symptoms, Dosage &
Description
it does not act like a fat-burning medication in people who already have adequate B12

You have undergone gastrointestinal or weight loss surgery
B12 is water-soluble, and most of it is urinated out

Expected 12-week outcome: approximately 1-2 kg additional fat loss, primarily from subcutaneous stores in the lower abdomen and flanks

Having an autoimmune disease : Some autoimmune diseases can damage the stomach lining (including pernicious anemia) where intrinsic factor is produced