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Roux-en-Y gastric bypass surgery (RYGB) but not sleeve gastric bypass surgery or gastric banding, increases the risk of vitamin B 12 deficiency and requires preventive post-operative treatment with either injected or high-dose oral supplementation
Most effective when taken at regular intervals
Can you have bariatric surgery reversed
Deficiency can lead to megaloblastic anemia and neurologic complications, while elevated levels may signal underlying liver disease or malignancy
