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Medically reviewed by Veronica Hackethal | MD, MSc , Harvard University | University of Oxford | Columbia Vagelos College of Physicians and Surgeons on April 20th, 2026

Anyone can be affected, but some groups are more at risk: Vegetarians and vegans, since B12 mainly comes from animal products Older adults, as absorption gets harder with age People with digestive issues like Crohns or coeliac disease Those taking certain medications, such as long-term metformin or stomach acid reducers People with pernicious anaemia, an autoimmune condition that stops you from absorbing B12 If you fit into one of these categories and notice symptoms, its worth getting your levels checked

For instance, you can find B12 in nutritional yeast, dairy products, and breakfast cereals fortified with this vitamin

Your provider will determine the exact dosing schedule and vial size appropriate for your plan