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Identifying the underlying cause is essential for appropriate management: Dietary history to assess B12 intake Medication review (metformin, proton pump inhibitors, H2-receptor antagonists) Assessment for malabsorption disorders (coeliac disease, Crohn's disease) Previous gastric surgery Autoimmune conditions History of nitrous oxide exposure (recreational or medical) NICE guidance emphasises that treatment should not be delayed whilst awaiting test results if clinical suspicion of B12 deficiency with neurological involvement is high, as delayed treatment may result in irreversible neurological damage

When left untreated, vitamin deficiencies can lead to various health problems, ranging from fatigue to permanent neurological changes

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Timing optimization (morning fasted-state dosing) does not change the compounds safety profile

This represents a key mechanism by which tirzepatide produces greater weight loss than diet alone despite similar caloric restriction