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Stomach or gut problems Various problems of the stomach or gut can be a cause of B12 deficiency
The biphasic response suggests possible mechanisms: lower doses (nanogram range) might work through growth factor upregulation and signaling cascade amplification, while higher doses (microgram range) might involve direct receptor activation or substrate provision for cellular repair
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
[2] How to Manage Discomfort After B12 Treatment Effective management of post-injection discomfort involves both practical self-care measures and appropriate medical follow-up
This makes it suitable for individuals who do not need appetite control or cannot tolerate GLP-1 agonist side effects
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