b12 injection how long does it take to work How Long Does a B12

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Cyanocobalamin Drugs (BNF)

It plays a key role in stimulating the release of gonadotropin-releasing hormone (GnRH), which is essential for puberty onset and maintaining reproductive function

These body composition changes occurred without any measured change in food intake meaning the weight loss was driven by metabolic changes rather than appetite suppression

Summary: B12 deficiency after gastric sleeve surgery occurs because the procedure reduces intrinsic factor production and gastric acid secretion, impairing vitamin B12 absorption and requiring lifelong supplementation