An essential vitamin available both as an FDA-regulated prescription injectable for diagnosed deficiency and as an over-the-counter dietary supplement.
Vitamin B12 (cobalamin) is an essential water-soluble vitamin required for red blood cell formation, neurological function, and DNA synthesis. It is available in multiple forms, including FDA-regulated prescription injectables for diagnosed deficiency and over-the-counter oral supplements.
Vitamin B12 injectable formulations are FDA-regulated for treatment of diagnosed deficiency. Oral supplement forms are available over the counter under dietary supplement regulations, which differ from prescription drug regulations.