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Severe deficiency: For severe cases, more doses or injections might be needed, even if there are neurological symptoms

Adequate levels of B12 can promote healthier skin, hair, and nails by supporting the production of new cells and preventing damage caused by free radicals

Gouda, M., & Ganesh, C

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