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Youre more likely to have low vitamin B12 levels if you: Follow a vegan or vegetarian diet Have pernicious anemia Have Crohns disease , atrophic gastritis, or celiac disease Have a BMI over 30 Have had intestinal surgery or gastric bypass surgery Take medications for heartburn or GERD Are over 50 years old Are pregnant Ask your primary care provider about getting your vitamin B12 levels checked if youre over 50 years old or at risk for low vitamin B12 levels
This means the medicine may not work as well
Retrieved 7 February 2026
Vitamin B12 and breastfeeding
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