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An autoimmune condition that destroys the cells that produce intrinsic factor, making oral B12 largely ineffective

doi: 10.1111/J.0954-6820.1978.TB08402.X

Aspiration before injection helps confirm the needle is not in a blood vessel

The benzyl alcohol acts as a preservative, a microscopic guardian that keeps the solution stable and safe for repeated use

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

"Primary Mechanisms of Thymosin 4 Repair Activity in Dry Eye Disorders and Other Tissue Injuries." Investigative Ophthalmology & Visual Science