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Methylcobalamin and adenosylcobalamin are also available as oral (tablet) and injectable nutritional supplements without a prescription

This subtle but important mechanism enables the solution to remain stable and safe for extended periods within a sealed vial when aseptic handling practices are followed

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Vitamin B12 deficiency can be caused by malabsorption, dietary inadequacy, inadequate intrinsic factor production, atrophic gastritis, interference with ileal uptake, drug-nutrient interactions, and genetic defects