The American Academy of Pediatrics considers vitamin B12 to be compatible with breastfeeding
B12 deficiency is quite common in both the US and UK, affecting around 6% of people aged under 60, and nearly 20% of those 60 and over
Most protocols use 0.3 mg per day injected into abdominal fat
Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect: Signs of an allergic reaction, like skin rash, hives with itching and red swollen blistered peeling skin with or without fever, wheezing, tightness in the chest or throat, trouble breathing, trouble swallowing, trouble talking, unusual hoarseness, or swelling of the mouth, face, lips, tongue, or throat