Can You Take Magnesium and Zinc Together?
Yes, you can take magnesium and zinc together at standard doses. However, at supplemental doses above 50mg of zinc or 400mg of magnesium, the two minerals can compete for absorption in the gut and reduce each other's effectiveness. Timing them apart by 2 hours is the safest approach if you're taking higher doses of either.
Why Magnesium and Zinc Compete
Magnesium and zinc are both divalent cations — meaning they carry a +2 charge — and share the same transport proteins in your small intestine. When you flood those transporters with large amounts of both minerals simultaneously, they end up competing for entry into your bloodstream. The mineral present in higher concentration tends to win, leaving less room for the other.
At the doses found in a typical multivitamin (10–15mg zinc, 100–200mg magnesium), this competition is negligible. The issue becomes meaningful when you're taking standalone high-dose supplements of both at the same time.
What the Research Says
A study in the Journal of the American College of Nutrition found that high-dose zinc (142mg daily) significantly inhibited magnesium absorption. Importantly, this was an extreme dose — nearly 10 times the recommended daily intake. At supplemental doses of 25–50mg zinc and 200–400mg magnesium, competition is present but clinically modest for most people.
Research also shows that zinc at 50mg or more taken alongside iron reduces zinc absorption by up to 56%, suggesting that the competition mechanism is dose-dependent and most relevant at higher intakes.
Best Timing for Magnesium and Zinc
Option 1 — Take them at separate meals (recommended)
Take zinc in the morning with breakfast and magnesium in the evening with dinner or before bed. This fully eliminates any competition and is the approach most supplement experts recommend.
Option 2 — Standard doses together is fine
If you're taking 15–30mg zinc and 200–400mg magnesium, taking them together is unlikely to cause meaningful absorption issues. The competition only becomes significant at high doses.
Option 3 — ZMA supplements
ZMA (Zinc Magnesium Aspartate) products combine both minerals deliberately and are widely used by athletes. These formulations are designed to be taken together at night, and research supports their combined use at those doses.
Ideal Doses
The recommended daily intake for zinc is 8–11mg for adults, with a tolerable upper limit of 40mg. For magnesium, the RDA is 310–420mg depending on age and sex. Most standalone magnesium supplements contain 200–400mg elemental magnesium. If your combined intake from food and supplements stays within these ranges, taking them together is unlikely to cause problems.
Signs Your Zinc or Magnesium May Be Low
If you're supplementing both but not seeing benefits, poor absorption due to timing or competition could be a factor. Low zinc often presents as frequent illness, slow wound healing, or hair loss. Low magnesium commonly causes muscle cramps, poor sleep, or fatigue — particularly in people who train regularly.
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