What Should You Not Take With Zinc? Iron, Medicines, Food

Nothing has to be avoided outright with zinc, but four things need a gap: iron supplements, ciprofloxacin and the other quinolone antibiotics, the tetracycline antibiotics (doxycycline, lymecycline, oxytetracycline and tetracycline) and penicillamine. Vitamin D, vitamin C and magnesium can go alongside it: a timing answer, not a ban. Adults need about 9.5 mg a day (men) and 7 mg (women), and the NHS line is "Do not take more than 25mg of zinc supplements a day unless advised to by a doctor".¹ The interactions chapter of the Wellgard zinc guide and the vitamins and minerals guide.

• Leave 2 hours: quinolone antibiotics (2 hours after the dose, or 4 before); a standalone iron supplement
• Leave 2 to 3 hours: doxycycline, lymecycline, oxytetracycline, minocycline, tetracycline
• Ask first: penicillamine, levothyroxine, alendronate, risedronate, diuretics
• Fine together: vitamin D, vitamin C, magnesium, folic acid, B12, omega-3
• With a meal if it makes you feel sick; add up the zinc across products

Sources checked on 30 October 2026.

What should you not take at the same time as zinc?

Zinc is a positively charged mineral. In the gut it binds certain antibiotic and bone-medicine molecules so the medicine is poorly absorbed, and it shares an uptake route with non-haem iron.^{2, 3, 19}

Which medicines interact with zinc, and how far apart should you take them?

Generic names only; your own leaflet comes first.

For the acne antibiotics lymecycline and doxycycline, the simplest arrangement is the antibiotic in the morning and zinc with the evening meal. Penicillamine is different: the UK Expert Group notes that zinc sulphate "is used to treat Wilson's disease", so anyone with that diagnosis takes zinc only as their specialist directs.¹²

Can you take zinc and iron together?

In a multivitamin, yes; as two separate supplements, space them. Non-haem iron and zinc share an absorptive pathway, and the inhibition becomes measurable at an iron-to-zinc ratio of 2:1 or more "when the total amount of ionic species is greater than 25 mg".³ Iron in a meal does not have this effect; iron in the same supplement does.¹¹ So a multivitamin with 14 mg of iron and 10 mg of zinc sits at 1.4:1 and 24 mg, under both thresholds; a standalone iron supplement plus a separate zinc product crosses them: different meals. See foods high in iron and iron supplement side effects.

Can you take zinc and calcium together?

Yes, with one caveat. The UK Expert Group on Vitamins and Minerals noted that "high levels of calcium in the diet can decrease zinc absorption", and the BNF lists the calcium salts as decreasing zinc absorption with no timing advice ("Manufacturer makes no recommendation"), so the two-hour gap on do you need a calcium supplement is a precaution, not a trial result.^{2, 12}

Can you take zinc and magnesium together?

Yes. Magnesium does not appear in the BNF's 28-entry zinc interaction list; the only official line is the EVM's "Excess zinc may also decrease magnesium and calcium uptake", about excess.^{2, 12} See what should you not take with magnesium and can you take zinc and magnesium together.

Can you take vitamin D and zinc together?

Yes. No interaction between vitamin D and zinc is documented in the NHS pages or the studies read here. Keep each within its UK line: zinc at or under 25 mg from supplements; vitamin D at 10 micrograms a day for adults, and "Do not take more than 100 micrograms (4,000 IU) of vitamin D a day as it could be harmful".¹³ See also vitamin C and zinc together and what you should not take with vitamin D.

Does copper matter?

Copper is why the 25 mg line exists: "Taking high doses of zinc reduces the amount of copper the body can absorb. This can lead to anaemia and weakening of the bones."¹ No regulatory document sets a zinc-to-copper ratio; zinc and copper and can you take too much zinc take this further.

Which foods block zinc absorption?

Phytate, the phosphorus store in wholegrains, pulses, nuts and seeds. Across 30 phytate studies, fractional zinc absorption fell by 0.14, to 45% of control, when a meal's phytate-to-zinc molar ratio was above 15.¹⁴ The UK diet sits under that: the median adult ratio in the National Diet and Nutrition Survey was 9.7.¹⁵ Zinc from meat, fish, dairy and eggs carries no phytate penalty.

Should you take zinc on an empty stomach?

Not if it makes you feel sick. The absorption case is brief: zinc taken with water between meals "initially is absorbed more efficiently than food zinc, but absorption efficiency declines within 24 hours".¹⁶ The EVM recorded that stomach symptoms were "particularly apparent when the supplements were taken with little or no food", and in a 150 mg trial 84% of women reported nausea, cramps or other symptoms, five withdrawing for gastric irritation.^{12, 17} So: a modest dose, with a meal, at the same time each day. When is the best time to take zinc covers morning against evening.

Who should ask a pharmacist or GP first?

Anyone on a prescription in the table. Anyone with Wilson's disease, previous stomach or bowel surgery, or a malabsorption condition. Heavy drinkers, since alcoholism is a recognised cause of zinc deficiency.¹⁸ People with diabetes or haemochromatosis, which the EVM names as groups with "insufficient data" on a safe intake.¹² Pregnant and breastfeeding women, who stay within 25 mg and ask a GP or midwife first. And everyone on more than one product, since the zinc adds up across labels (how much zinc a day).¹

What we don't know

The tetracycline figure comes from one 1975 crossover in 7 volunteers; we found no trial of a supplement-sized dose or of the gap itself.⁷ Whether iron and zinc competing in a supplement changes zinc status over months is "not known", says the review that set the 2:1 and 25 mg thresholds.³

Frequently asked questions

What should you not mix zinc with?

Iron supplements, the quinolone and tetracycline antibiotics, penicillamine, and alendronate or risedronate: all spaced, none banned.^{2, 19}

Can I take five different vitamins at once with zinc?

Yes, within each nutrient's UK line, with two checks: add up the zinc across the products, and take a standalone iron supplement at a different meal.^{1, 3}

Can I take zinc with folic acid, B12 or omega-3?

Yes. No interaction with folic acid, vitamin B12 or omega-3 is documented in the NHS pages or the studies read here.

What helps zinc absorb better?

Protein in the meal, and phytase, germination and fermentation, which "markedly" improve absorption: a point for sourdough and soaked pulses rather than raw bran.¹¹

Sources

1. NHS. Vitamins and minerals: others (zinc, copper, magnesium). Page last reviewed 3 August 2020 (review overdue). nhs.uk.
2. NICE. British National Formulary: zinc, interactions. Prescribing reference. bnf.nice.org.uk.
3. Solomons NW. Competitive interaction of iron and zinc in the diet: consequences for human nutrition. Journal of Nutrition, 1986. Narrative review; funding not stated on PubMed. PubMed 3522825.
4. NHS. Ciprofloxacin. Page last reviewed 9 October 2026. nhs.uk.
5. NHS. Doxycycline. Page last reviewed 5 September 2025. nhs.uk.
6. NHS. Taking lymecycline with other medicines and herbal supplements. Page last reviewed 13 April 2026. nhs.uk.
7. Penttilä O, Hurme H, Neuvonen PJ. Effect of zinc sulphate on the absorption of tetracycline and doxycycline in man. European Journal of Clinical Pharmacology, 1975. Crossover study, 7 volunteers, single dose; funding not stated on PubMed. PubMed 786686; doi:10.1007/BF00614009.
8. NICE. British National Formulary: penicillamine, interactions. Prescribing reference. bnf.nice.org.uk.
9. NHS. Levothyroxine. Page last reviewed 6 July 2026. nhs.uk.
10. Braun LA, Rosenfeldt F. Pharmaco-nutrient interactions: a systematic review of zinc and antihypertensive therapy. International Journal of Clinical Practice, 2013. Systematic review, 8 small studies; public or charity funding listed on PubMed. PubMed 23279674.
11. Lönnerdal B. Dietary factors influencing zinc absorption. Journal of Nutrition, 2000. Narrative review; funding not stated on PubMed. PubMed 10801947.
12. Expert Group on Vitamins and Minerals. Safe Upper Levels for Vitamins and Minerals, 2003 (zinc chapter, pp 253-262). Expert committee report. UK Government Web Archive.
13. NHS. Vitamins and minerals: vitamin D. Page last reviewed 3 August 2020 (review overdue). nhs.uk.
14. Bel-Serrat S, et al. Factors that affect zinc bioavailability and losses in adult and elderly populations. Nutrition Reviews, 2014. Systematic review, 87 publications, 30 on phytate; public or charity funding listed on PubMed. PubMed 24739133.
15. Amirabdollahian F, Ash R. An estimate of phytate intake and molar ratio of phytate to zinc in the diet of the people in the United Kingdom. Public Health Nutrition, 2010. National Diet and Nutrition Survey analysis, 6,786 people; public or charity funding listed on PubMed. PubMed 20409358.
16. King JC. Does zinc absorption reflect zinc status? International Journal for Vitamin and Nutrition Research, 2010. Narrative review; funding not stated on PubMed. PubMed 21462113.
17. Samman S, Roberts DC. The effect of zinc supplements on plasma zinc and copper levels and the reported symptoms in healthy volunteers. Medical Journal of Australia, 1987. Double-blind crossover trial, 47 volunteers, 6 weeks; public or charity funding listed on PubMed. PubMed 3547053.
18. Prasad AS. Clinical manifestations of zinc deficiency. Annual Review of Nutrition, 1985. Narrative review; US government funding listed on PubMed. PubMed 3896271.
19. Ciprofloxacin 500 mg film-coated tablets. Summary of Product Characteristics (licensed product information), section 4.5, revised 29 May 2026. medicines.org.uk.

Spotted something out of date? Email support@wellgard.co.uk with the page address and the sentence.

This article is general information, not medical advice. Ask your pharmacist how to space supplements around any prescribed medicine, and do not take more than 25 mg of zinc a day from supplements unless a doctor has advised it.