NutriStack
Calcium and Zinc Picolinate, timing-sensitive.
High-dose calcium can reduce zinc picolinate absorption when taken simultaneously.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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What the row says.
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At a glance
- Substances
- Calcium and Zinc Picolinate
- Pair type
- Timing Sensitive
- Evidence (highest tier)
- Moderate
- Source citations
- 3 sources
- Stack Score effect
- −5 to your Stack Score (per scored timing-sensitive row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Timing Sensitive · Moderate evidence
Timing Sensitive
What is happening. High-dose calcium can reduce zinc picolinate absorption when taken simultaneously.
Mechanism. Calcium may interfere with zinc picolinate absorption via competition for shared transport mechanisms in the intestinal epithelium, though the effect is less pronounced than calcium-iron competition.
Recommendation. Separate calcium and zinc picolinate supplements by at least 2 hours for optimal absorption of both.
Minimum separation. 120
Sources (3)
- Wood RJ, Zheng JJ. High dietary calcium intakes reduce zinc absorption and balance in humans. Am J Clin Nutr. 1997. PMID 9174476
- 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 Zinc Picolinate are in the same stack, this pair applies −5 to your Stack Score (per scored timing-sensitive row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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