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Table of Contents Key Takeaway B12 shots are not a quick fix for weight loss or fatigue, but they are a reliable way to restore an essential nutrient that supports energy, metabolism, and overall wellness

Since its preclinical half-life is brief (around 4 minutes), practical application relies on formulation and dosing to maintain local exposure adequate for metabolic activity

If weight loss is the primary objective and your B12 is normal, dont expect injections to be the answer

Owing to the extremely efficient enterohepatic circulation of B 12 , the liver can store 3 to 5 years' worth of vitamin B 12

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