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A delayed adverse drug effect or interaction could easily occur with vitamin B12 since the time necessary for most patients to become deficient can be delayed one or more years due to high storage levels in the body

Adult growth hormone deficiency: Diagnostic and treatment journeys from the patients perspective

Older cats with intestinal, pancreatic, or hepatobiliary disease or in an anorexic state are at greater risk of cobalamin deficiency, because serum cobalamin concentration physiologically decreases with age [39]

Vitamin K intake and breast cancer incidence and death: results from a prospective cohort study

Bariatric surgery can increase the risk for Vitamin B 12 deficiency, which has been reported in patients of all bariatric procedure types