NutriStack
Doxycycline and Zinc, timing-sensitive.
Zinc chelates doxycycline, reducing its absorption. While the effect is somewhat less pronounced than with calcium or iron, it is still clinically relevant and can reduce antibiotic efficacy, particularly at higher zinc supplement doses.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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At a glance
- Substances
- Doxycycline and Zinc
- Pair type
- Timing Sensitive
- Evidence (highest tier)
- Moderate
- Source citations
- 4 sources
- Stack Score effect
- −5 to your Stack Score (per scored timing-sensitive row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Timing Sensitive · Moderate evidence
Timing Sensitive
What is happening. Zinc chelates doxycycline, reducing its absorption. While the effect is somewhat less pronounced than with calcium or iron, it is still clinically relevant and can reduce antibiotic efficacy, particularly at higher zinc supplement doses.
Mechanism. Zinc forms chelation complexes with doxycycline's adjacent hydroxyl and keto groups. While zinc's chelation affinity for tetracyclines is slightly lower than iron or calcium, it still produces clinically meaningful reductions in doxycycline bioavailability.
Recommendation. Separate doxycycline and zinc supplements by at least 2 hours to minimize the chelation interaction. Check multivitamins for zinc content and time accordingly.
Minimum separation. 120
Sources (4)
- Neuvonen PJ. Interactions with the absorption of tetracyclines. Drugs. 1976;11(1):45-54. PMID 1083209
- Hsu TJ, Hsieh RH, Huang CH et al.. Efficacy of Zinc Supplementation in the Management of Primary Dysmenorrhea: A Systematic Review and Meta-Analysis.. Nutrients. 2024. PMID 39683510
- Ali AA, Naqvi SK, Hasnain Z et al.. Zinc supplementation for acute and persistent watery diarrhoea in children: A systematic review and meta-analysis.. Journal of Global Health. 2024. PMID 39641338
- Oh C, Keats EC, Bhutta ZA. Vitamin and Mineral Supplementation During Pregnancy on Maternal, Birth, Child Health and Development Outcomes in Low- and Middle-Income Countries: A Systematic Review and Meta-Analysis.. Nutrients. 2020. PMID 32075071
Stack Score
How this pair moves the number.
Effect on the composite score
If both Doxycycline and Zinc 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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