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Vitamin B12 is required for the function and development of many parts of the body, including the brain, nerves, and blood cells. Since your body doesn't make vitamin B12, you have to The B12 Shot: What Every Human Needs to Know About Injectable Vitamin B12 The Advantages of B12 Injections Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine Vitamin B12 Injections and Weight Loss: How Does it Work?
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