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Without a strong myelin sheath, nerves are exposed and become damaged, which may even lead to nerve cell death

Many patients store their backup pens in the refrigerator's main section rather than the door, which experiences more temperature variation when opened and closed

Some of the best dietary sources of B12 include [3]: Beef Turkey Salmon, tuna, and clams Eggs Milk, yogurt, and cheese Nutritional yeast Fortified breakfast cereals Bananas and strawberries Spinach Kidney beans Due to dietary restrictions, vegetarians and vegans are at risk of low levels of B12

Recent studies support the use of vitamin B12 supplements for improving symptoms of depression in people deficient in this vitamin