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Understanding Vitamin B12 Deficiency Vitamin B12 deficiency occurs when your body lacks enough of this essential nutrient, leading to symptoms like: Persistent fatigue Weakness and lightheadedness Numbness or tingling in hands and feet Memory problems and difficulty concentrating Mood changes, including irritability and depression Certain factors increase your risk, such as age, certain medications, digestive conditions, and restrictive diets

However, if your body has trouble absorbing B12 due to digestive issues, pills may not be as effective

Instructions and everything you need are included

How long do the results usually last