Supplement × Prescription·Evidence index
PubMed indexes 8 records that name Omeprazole and Vitamin B12 together, either in the title or in an interaction, co-administration, or pharmacokinetic context. The key findings come first, in the authors’ own words, followed by every study with its design and PubMed link.
A summary of published research, not medical advice. A pharmacist can check any combination against your full list of medicines and supplements.
Reviews and human studies first. Each quote is the authors’ own conclusion about their study, not a NutriStack assessment, and a single study is not a consensus.
“Long-term use of omeprazole is suggested to induce an oxidative stress condition, which causes neurotoxicity and cognitive decline.”
“All healthcare workers should be made aware of the potential clinical complications of omeprazole-associated vitamin B12 deficiency since it may go unrecognized and is easily corrected. This is particularly relevant for elderly patients with poor dietary intake of vitamin B12, impaired vitamin B12 stores, and certain gastrointestinal disorders.”
“The development of atrophic gastritis during omeprazole treatment in H. pylori-positive GERD patients is associated with a decrease of serum vitamin B12 levels.”
Strongest relevance first: papers naming both substances in the title, then human trials and systematic reviews.
“Omeprazole therapy acutely decreased cyanocobalamin absorption in a dose-dependent manner.”
Names both Omeprazole and Vitamin B12 in its title.
“Omeprazole causes protein-bound vitamin B12 malabsorption, and ingestion of an acidic drink improves protein-bound vitamin B12 absorption.”
Names both Omeprazole and Vitamin B12 in its title.
“Long-term use of omeprazole is suggested to induce an oxidative stress condition, which causes neurotoxicity and cognitive decline.”
Names both Omeprazole and Vitamin B12 in its title.
“All healthcare workers should be made aware of the potential clinical complications of omeprazole-associated vitamin B12 deficiency since it may go unrecognized and is easily corrected. This is particularly relevant for elderly patients with poor dietary intake of vitamin B12, impaired vitamin B12 stores, and certain gastrointestinal disorders.”
Names both Omeprazole and Vitamin B12 in its title.
“The development of atrophic gastritis during omeprazole treatment in H. pylori-positive GERD patients is associated with a decrease of serum vitamin B12 levels.”
Names both Omeprazole and Vitamin B12 in its title.
“CYP2C19 polymorphism significantly affected serum vitamin B12 levels in patients on long-term therapy with omeprazole. In the future, genotyping of CYP2C19 may be useful for patients in need of long-term treatment with omeprazole or other proton pump inhibitors.”
Names both Omeprazole and Vitamin B12 in its title.
Names both Omeprazole and Vitamin B12 in its title.
Names both Omeprazole and Vitamin B12 in its title.
Search-based evidence indexes have real limits, and it is worth being explicit about them:
NutriStack is a free iPhone app for organising a supplement routine: what you take, when, and what the published record says about it. Its exploratory interaction checker covers Omeprazole, Vitamin B12, and several hundred other substances.
Log your routine, get reminders at the times you choose, and scan a label to add a product. The checker is a research and organisation tool, not a clinical decision aid.
NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.
