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When deficiency is suspected based on clinical features (fatigue, paraesthesia, cognitive changes) or risk factors (vegan diet, gastric surgery, certain medications), serum B12 measurement guides appropriate intervention

Do not use in individuals with known hypersensitivity to benzyl alcohol

The popular claim that the effect fades after 4 to 6 weeks so you have to cycle is a widely repeated myth with no primary study behind it, and the mechanism actually argues against a classic tolerance effect

A very recent study consistently found a strong negative association between sleep quality and VitB12 intake in healthy adults [22]