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Malabsorption of vitamin B12, resulting from structural or functional damage to the stomach, where intrinsic factor is secreted or to the ileum, where intrinsic factor facilitates vitamin B12 absorption

Not effective for individuals with severe deficiencies

Vitamin B12 is essential for energy production, brain function, and red blood cell formation

Vitamin B 12 is available only in animal foods (meat and dairy products) or yeast extracts (such as brewer's yeast)

Therefore, these factors should be taken into consideration and regular monitoring should be performed in these conditions while treating vitamin B12 deficiency with cyanocobalamin

These conditions prevent the body from adequately absorbing oral B12 through the digestive tract