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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

B12 plays a key role in several processes like producing red blood cells, converting food into energy, and producing nerves

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As an investigational peptide, any legitimate clinical use involves a licensed provider, a prescription, and compounding through a licensed pharmacy