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Can You Take Zinc and Magnesium Together?
They're bundled together in half the “ZMA” sleep formulas on the shelf — but do they actually compete for absorption? The answer depends almost entirely on dose.
The short answer: yes at normal doses — mind the timing only if zinc is high
Quick answer
Yes. At standard supplement doses, zinc and magnesium can be taken together safely, and the absorption competition between them is minimal. The caveat is dose: high-dose zinc (roughly above 140 mg/day — far more than the ~8-11 mg RDA) can inhibit magnesium absorption, and one 2020 pharmacokinetic study found that taking both in a single combined dose reduced absorption of each by up to ~40%. So for normal doses, together is fine; if you take high-dose zinc, spacing the two by 1-2 hours maximizes absorption.
This is why pre-made ZMA-style formulas exist and work for most people — at sensible doses the interaction is small. The competition only becomes meaningful when zinc is dosed well above what most people need.
Do zinc and magnesium compete for absorption?
Quick answer
A little, and mostly in one direction. Both are positively charged minerals that use overlapping pathways in the small intestine, so at high concentrations they can interfere — but research shows high-dose zinc is the main driver, tending to blunt magnesium absorption more than the reverse. At everyday supplemental amounts the effect is minor. The practical line: zinc's RDA is about 8 mg (women) to 11 mg (men), and inhibition of magnesium becomes a concern mainly with very high zinc intakes, not standard multivitamin or ZMA doses.
For magnesium specifically, the form you choose matters more than the zinc next to it — see our magnesium forms guide. And for other pairings, see magnesium + ashwagandha and vitamin D + magnesium.
How to take them
Quick answer
If you're using normal doses (e.g., a multivitamin or a standard ZMA formula), take them together, ideally with food to reduce stomach upset — many people take magnesium in the evening because it can aid relaxation and sleep. If you take high-dose zinc (for example, short-term immune support), separate it from magnesium by 1-2 hours to avoid blunting absorption. Avoid taking zinc on a completely empty stomach if it causes nausea, and don't exceed the tolerable upper intake for zinc (40 mg/day) long-term without medical guidance.
Bottom line on logistics: normal doses, take together; high-dose zinc, space it out. For the evidence-first view of what's worth taking at all, see supplements that actually work.
The evidence base, cited
Zinc and magnesium share overlapping intestinal absorption pathways, with high-dose zinc (above ~140 mg/day) the primary inhibitor of magnesium uptake; at standard doses competition is minimal. A 2020 pharmacokinetic study reported that a single combined dose could reduce absorption of both minerals by up to ~40%, supporting spacing them when high doses are used (Drugs.com clinical summary; zinc RDA/UL per NIH Office of Dietary Supplements).
Sources: Drugs.com | NIH ODS (Zinc). General information, not medical advice.
The bottom line
Can you take zinc and magnesium together? Yes — at normal doses the competition is negligible, which is why ZMA formulas work. Only if you're taking high-dose zinc should you space it from magnesium by an hour or two. Take with food, keep zinc under 40 mg/day long-term, and you're set.
This article is general information about supplements, not medical advice. Consult a healthcare professional about doses and any medication.
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