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Common symptoms include: Fatigue Difficulty concentrating or remembering (Brain Fog) Heart palpitations Pale skin Weight loss Numbness and tingling in the hands and feet Mood changes, including irritability or depression Sore tongue Decreased appetite Constipation Why consider Vitamin B12 injections
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doi:10.3390/nu13061913
As a result, the richest natural sources are: Shellfish : Clams, oysters, and mussels Fish : Salmon, trout, tuna, and sardines Meat : Beef liver, steak, and poultry Dairy : Milk, yogurt, and cheese Eggs : Particularly the yolk Most people meeting a varied omnivorous diet will achieve adequate intake, but certain diets and digestive issues can impair absorption