NutriStack
Pantoprazole and Vitamin B12, a caution.
Pantoprazole, like all PPIs, impairs vitamin B12 absorption by suppressing gastric acid needed to release B12 from food proteins. The risk increases with duration of use and can lead to megaloblastic anemia and neurologic symptoms if undetected.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Pantoprazole and Vitamin B12
- Pair type
- Caution
- Evidence (highest tier)
- Strong
- Source citations
- 1 source
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Strong evidence
Caution
What is happening. Pantoprazole, like all PPIs, impairs vitamin B12 absorption by suppressing gastric acid needed to release B12 from food proteins. The risk increases with duration of use and can lead to megaloblastic anemia and neurologic symptoms if undetected.
Mechanism. Pantoprazole suppresses gastric acid and pepsinogen activation, preventing the release of protein-bound B12 in the stomach. Without this critical first step, B12 cannot bind to intrinsic factor and be absorbed in the ileum.
Recommendation. Monitor B12 levels periodically during long-term pantoprazole therapy. Sublingual B12 supplementation is preferred as it bypasses the gastric absorption pathway affected by PPIs.
Stack Score
How this pair moves the number.
Effect on the composite score
If both Pantoprazole and Vitamin B12 are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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