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However, B12 deficiency often affects females of reproductive age, and can cause complications during pregnancy and nursing

Over-the-counter B12 supplements are widely available in the UK in various forms, including: Cyanocobalamin tablets the most common form in supplements Methylcobalamin sometimes marketed as more bioavailable, though evidence for superiority over standard oral tablets is limited Sublingual (under-the-tongue) preparations no proven advantage over standard oral tablets has been established Combination B-vitamin complexes Patients should be aware that most supplements are regulated as food products , not medicines, and quality can vary between brands

Many bodily functions depend on vitamin B12

Oral formulations are mainly discussed for gastrointestinal applications, but research remains limited