Good sources of Vitamin B12 are meat, fish, milk, dairy, and eggs
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Sardines Sardines are especially nutritious because, aside from being high in vitamin B12, they also contain high amounts of the minerals phosphorus, calcium, and potassium
These include vitamin B12 deficiency and malabsorption that is caused by the following medical conditions, according to the NIH [1]: Pernicious anemia Tropical sprue Pancreatic insufficiency Surgery in the gastrointestinal tract Certain medications Deficiency in the diet Side effects of B-12 injections Also, according to the NIH, vitamin B-12 injections have some potential side effects, including [1]: Diarrhea Itching Swelling Risk of allergic reaction and anaphylaxis Can Vitamins Aid in Weight Loss
these guidelines recommend contraception requirements for patients of childbearing potential
Clinical data is sparse and inconsistent