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These findings align with global analyses from Europe, North America, and Asia reporting similar population-level increases in vitamin B12 deficiency, where prevalence ranges from 5 to 20% depending on age, diet, and socioeconomic status

The Serum Vitamin B12 Test is a blood test that evaluates the concentration of vitamin B12 in the bloodstream

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Daily oral cobalamin supplements can contain doses that far exceed (as high as 10,000 g/tablet) the recommended daily amount of 2.4 g/day in humans

However, there are currently few studies on the relationship between B vitamins and breast cancer, and the role of B vitamins in the occurrence and development of breast cancer is still inconclusive