A complete safety, timing, and dosage guide for combining Zinc with Magnesium (Citrate, Glycinate, Oxide, Threonate) — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can take magnesium and zinc together, but it is best to space them out because they compete for absorption in the gut.
Magnesium and zinc together can interfere with each other's absorption, so taking them at separate times is the best approach. The two minerals compete for shared transport pathways, and high doses of one can reduce the uptake of the other. Taking them at least two hours apart minimizes this interaction.
Both magnesium and zinc are positively charged divalent cations that are absorbed primarily in the small intestine. They share several transport proteins, including TRPM6/7 and certain ZIP transporters, which means they can competitively inhibit each other's uptake when present together at high concentrations. Additionally, zinc can induce metallothionein, a protein that binds to both minerals but has a much higher affinity for copper than for zinc or magnesium; this can indirectly affect magnesium balance. The most well-documented interference, however, is at low intestinal absorption sites: supplemental zinc above 50 mg per day can significantly lower magnesium absorption, while very high magnesium intake may reduce zinc absorption. Because competition is dose-dependent, moderate doses taken at separate meals usually avoid the problem.
If you need both magnesium and zinc, the simplest approach is to take zinc in the morning and magnesium in the evening, separated by at least 2 hours. Take zinc with a meal containing protein to improve absorption, and avoid high-fiber foods or whole grains at the same time. Take magnesium with a small meal or with water; if it causes loose stools, switch to magnesium glycinate or split the dose. Do not take these minerals together with dairy products, iron supplements, or thyroid medication, as these can further reduce absorption. If you miss a dose, just continue with your next scheduled dose—do not double up.
Magnesium oxide is less bioavailable and more likely to cause loose stools, while citrate, glycinate, and threonate forms are absorbed better and generally better tolerated. Zinc glycinate, citrate, or picolinate are better absorbed than zinc oxide, though the competition with magnesium is based more on the amount of elemental mineral than on the specific salt. Choosing well-absorbed forms at lower doses can reduce the degree of interference, but spacing them out is still recommended. If you have a sensitive stomach, magnesium glycinate is often the gentlest option.
These two minerals are commonly paired in ZMA formulas (zinc, magnesium, vitamin B6) designed for sleep and recovery, and they often appear together in multimineral supplements and prenatal vitamins.
Yes, you can take them at the same time, but I generally recommend against it because they compete for absorption in the gut. Taking them together can lower the amount your body absorbs, so it is better to space them by at least two hours. If you are taking a supplement that already combines them, like ZMA, follow the label instructions.
Yes, it is safe for most healthy adults to take both minerals daily, as long as you stay within recommended doses and take them at separate times. If you are supplementing both, be mindful not to exceed 40 mg of zinc and 350 mg of supplemental magnesium per day without medical supervision. I always remind patients that more is not better when it comes to trace minerals.
I tell my patients to wait at least two hours between taking zinc and magnesium. This allows each mineral to be absorbed in a less competitive environment. A 2-hour gap is usually enough to avoid the most significant absorption interference.
Yes, they do. Both are positive divalent cations that share some absorptive transporters in the intestine, so they can interfere with each other when taken together. Taking them at separate times reduces this competition, which is why I recommend spacing them out.
People with kidney disease, those taking antibiotics or thyroid medication, and anyone already getting high amounts of minerals from a multivitamin should be cautious. I also recommend that pregnant women avoid exceeding 40 mg of zinc daily from supplements. If you are unsure, talk to your doctor or a dietitian.
Take zinc with a meal to reduce nausea, and avoid taking it alongside high-calcium foods. Magnesium is best taken with a small meal or a glass of water; taking it on an empty stomach can sometimes cause stomach upset. A light meal that is not rich in dairy or iron works well for both.
Reviewed by Caroline M. on April 8, 2026 for accuracy against the sources listed above. This page is educational and is not a substitute for professional medical advice.
The matrix has 86 supplements and 7310 pairwise interactions. Click any cell to see the full breakdown.