Supplement stacks / Omeprazole + Vitamin B12
Can You Take Omeprazole with Vitamin B12?
Omeprazole may affect the absorption of Vitamin B12, potentially leading to deficiency if used long-term. While taking Vitamin B12 with omeprazole is generally considered safe, monitoring levels may be advisable, especially with prolonged use. Vitamin B1 and other B vitamins are typically safe to take alongside omeprazole.
Conservative, AI-assisted reading of publicly available medical sources (NIH, Mayo Clinic, WebMD, Examine.com). Informational only — it can't account for your medications, conditions, or genetics.
Suggestion: Consider monitoring Vitamin B12 levels if using omeprazole long-term.
Generally safe; long-term use may lead to nutrient deficiencies.
Typical dosage: 20-40 mg daily
- Headache
- Diarrhea
- Nausea
- Monitor for signs of nutrient deficiencies, especially B12.
Generally safe; however, long-term use of omeprazole may impair absorption.
Typical dosage: 250-500 mcg daily
- Mild diarrhea
- Nausea
- Headache
- Monitor B12 levels if on omeprazole long-term.
- Consult healthcare provider if experiencing symptoms of deficiency.
These come up in questions about this combination — they are not part of the pair above.
Vitamin B1 (Thiamine)
Generally safe; no known significant interactions with omeprazole.
Typical dosage: 1.1-1.2 mg daily
- Rare allergic reactions
- Nausea
- Consult healthcare provider if on diuretics or have chronic conditions.
Vitamin B6 (Pyridoxine)
Generally safe; no known significant interactions with omeprazole.
Typical dosage: 1.3-2.0 mg daily
- Nausea
- Headache
- Fatigue
- High doses may lead to neuropathy; consult healthcare provider.
Folic Acid
Generally safe; no known significant interactions with omeprazole.
Typical dosage: 400-800 mcg daily
- Nausea
- Bloating
- Consult healthcare provider if on methotrexate or have kidney issues.
Take Vitamin B12 in the morning for optimal absorption, ideally on an empty stomach.
- Consider taking Vitamin B12 supplements if on omeprazole for an extended period.
- Consult with a healthcare provider for regular monitoring of Vitamin B12 levels.
- Monitor Vitamin B12 levels if using omeprazole long-term.
Can you take Omeprazole and Vitamin B12 together?
Omeprazole may affect the absorption of Vitamin B12, potentially leading to deficiency if used long-term. While taking Vitamin B12 with omeprazole is generally considered safe, monitoring levels may be advisable, especially with prolonged use. Vitamin B1 and other B vitamins are typically safe to take alongside omeprazole.
How safe is the Omeprazole and Vitamin B12 combination?
Our analysis of publicly available medical sources scores this combination 7/10 (medium risk). This is an informational estimate, not medical advice — always confirm with a healthcare professional.
When should you take Omeprazole and Vitamin B12?
Take Vitamin B12 in the morning for optimal absorption, ideally on an empty stomach.
What should you watch out for when combining Omeprazole and Vitamin B12?
Monitor Vitamin B12 levels if using omeprazole long-term.
Taking more than these two? Run your complete supplement list — plus any medications — through the live checker for a combined analysis.
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Analysis generated August 10, 2026 · Sources include NIH, Mayo Clinic, WebMD, and Examine.com · How our analysis works