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Furthermore, individuals with decreased stomach acid production may experience an overgrowth of anaerobic bacteria in the stomach, which can interfere with vitamin B12 absorption 8 and approximately 30 percent of the elderly have low secretion of stomach acid
Treatment of Vitamin B12 Deficiency Thirty mcg daily for 5 to 10 days followed by 100 to 200 mcg monthly injected intramuscularly
Oral AOD 9604 formulations exist but have significantly lower bioavailability than subcutaneous injection
2221, National Institutes of Health
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