OBJECTIVE: To examine the relationship between serum vitamin B12 levels in older adults on histamine(2) receptor antagonists (H2 blockers) or proton-pump inhibitors (PPI) over 6 years. Participants: A cross-sectional sample of 659 adults, 60 to 102 years, from long-term care facilities and community ambulatory care (C) in the Bronx. MEASUREMENTS: Patient demographics, serum B12 levels,… Read more »