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Serum B12 and basic hematologic tests usually provide a clear answer
Vitamin B12 supplements are recommended to population groups at higher risk for developing vitamin B12 deficiency: everyone (no matter what their diet) over 50 years old, people with diseases of the gastrointestinal system such as Chrohns and IBS, women on oral contraceptives and people who regularly use nitrous oxide or are alcoholics
Professional guidance is key
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