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Vitamin B12 deficiency Having trouble absorbing vitamin B12 from food, lacking intrinsic factors (for example, as a result of pernicious anaemia), having gastrointestinal surgery, taking certain medications for an extended period of time (such as metformin or proton pump inhibitors), and nutritional deficiencies are all causes of vitamin B12 deficiency

But if your diet is heavily plant-based or inconsistent, supplementation may still help

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If an individual has autoimmune atrophic gastritis, the body will not produce enough intrinsic factors or stomach acid

Each type of anemia has its own unique causes and symptoms, and accurate diagnosis is essential for effective treatment