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Nurse Kalenak prefers either methylcobalamin or hydroxocobalamin, rather than cyanocobalamin

Vitamin B12 is a crucial water-soluble vitamin that supports various important functions in the body, including: DNA synthesis and production

Since B12 is found primarily in animal products, including meat, fish, dairy, and eggs, a substantial reduction in food intake can reduce B12 consumption below optimal levels, particularly for patients who were already borderline deficient before starting treatment or whose diets lean toward plant-based foods

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