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Some advertisements promote vitamin B12 injections as a way to boost energy, improve metabolism, or help with weight loss

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Vitamin B12 is a water soluble vitamin and helps the body to properly form red blood cells, grow tissues, and replicate DNA

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Official Recommendation: Fasting NOT required for serum B12 testing Most labs do not require fasting Guidelines do not mandate fasting However, Some Experts Suggest: Overnight fast preferred for consistency Avoid B12 supplements for 24-48 hours before the test Avoid excessive B12-rich foods the day before the test Why the Controversy