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Description
Elevated methylmalonic acid and total homocysteine levels show high prevalence of vitamin B12 deficiency after gastric surgery

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2.4 mcg in adults 6 Total body storage of vitamin B 12 ranges from 2 to 5 mg, and approximately half of it is stored in the liver

doi: 10.1097/JIM.0000000000000187

Since 1 June 2025 that authorisation should follow a face-to-face assessment
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