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Regarding weight management , NHS guidance is unequivocal: B12 supplementation is not recommended as a weight loss intervention

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

How to give someone else a subcutaneous injection The steps above apply whether you give yourself a subcutaneous shot or one to someone else