NutriStack
Calcium and Pantoprazole, a caution.
Pantoprazole, like other PPIs, reduces gastric acidity needed for calcium carbonate absorption. Long-term use may impair calcium balance and has been associated with increased fracture risk in epidemiologic studies.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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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
- Calcium and Pantoprazole
- Pair type
- Caution
- Evidence (highest tier)
- Moderate
- Source citations
- 3 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Moderate evidence
Caution
What is happening. Pantoprazole, like other PPIs, reduces gastric acidity needed for calcium carbonate absorption. Long-term use may impair calcium balance and has been associated with increased fracture risk in epidemiologic studies.
Mechanism. Pantoprazole inhibits gastric H+/K+ ATPase, raising gastric pH. Calcium carbonate requires pH <4 for adequate dissolution. The reduced acidity impairs calcium carbonate solubility and subsequent calcium ion absorption in the small intestine.
Recommendation. Use calcium citrate instead of calcium carbonate if on long-term pantoprazole therapy. Ensure adequate vitamin D for calcium absorption and discuss fracture risk with your prescriber.
Sources (3)
- Yang YX et al. Long-term proton pump inhibitor therapy and risk of hip fracture. JAMA. 2006;296(24):2947-2953. PMID 17190895
- Liu C, Kuang X, Li K, Guo X, Deng Q, Li D. Effects of combined calcium and vitamin D supplementation on osteoporosis in postmenopausal women: a systematic review and meta-analysis of randomized controlled trials. Food & Function. 2020. PMID 33237064
- Yao P, Bennett D, Mafham M et al.. Vitamin D and Calcium for the Prevention of Fracture: A Systematic Review and Meta-analysis. JAMA Network Open. 2019. PMID 31860103
Stack Score
How this pair moves the number.
Effect on the composite score
If both Calcium and Pantoprazole 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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