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Sharper mental function This injection supports the health of your brain and nerves, which can enhance your ability to think clearly, focus better, and maintain mental sharpness

If you're not getting enough B12, you can experience anemia, fatigue, weakness, constipation, decreased appetite, weight loss, dizziness, lightheadedness, confusion, poor memory, soreness of your tongue and mouth, and tingling and numbness in your hands and feet, according to Harvard Health Publishing

Every vial carries a batch number matching the COA

It can cause vision disturbances, or it could lead to optic nerve damage

Neither is universally better