Patients receiving gastric bypass surgery for severe obesity and found to have low B12 levels were used in the study. Patients were given 1 of 4 different doses of oral B12 and evaluated for deficiency after 3 months of oral therapy. Patients receiving at least 350 micrograms of vitamin B12 daily were able to maintain sufficient levels at the end of the study. The researchers concluded that most patients could meet their B12 needs with at least 350 micrograms of oral B12, thus eliminating the need for monthly injections in most cases.
Rhode, Barbara M PDt.
Treatment of Vitamin B12 Deficiency after Gastric Surgery for Severe Obesity.
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