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Diagnosis usually entails measuring serum levels of vitamin B12 or identifying elevated levels of methylmalonic acid and homocysteine

Stay Hydrated: GLP-1 and GIP medications can sometimes cause mild nausea

Your body does not make vitamin B12 on its own, so you must consume food and drinks that have vitamin B12 to receive it

But the doses studied were much larger around 0.3 grams per kilogram of body weight and often caused severe gastrointestinal distress

This matters for measurement accuracy: a 100 mcg amount is 3 units from a 10 mg vial versus 6 units from a 5 mg vial, and at 3 units a single-unit misread is a 33% error