Can You Take Zinc and Magnesium Together?

Zinc and magnesium are two of the most commonly taken supplements. Both support hundreds of biological processes, and most people don't get enough of either from diet alone. But a persistent question comes up: can you take them together, or do they interfere with each other?

The short answer

You can take zinc and magnesium together in moderate doses without significant issues. However, at high doses, they do compete for absorption, so separating them can optimise how much of each your body actually uses.

How they interact

Zinc and magnesium are both divalent cations (positively charged ions with a +2 charge). They share some of the same absorption pathways in the gut, particularly through DMT1 (divalent metal transporter 1) and other mineral transport proteins.

At standard supplemental doses (15-30mg zinc, 200-400mg magnesium), the competition is relatively minor. Studies suggest that moderate doses of one mineral don't dramatically reduce absorption of the other.

However, at high doses (particularly zinc above 50mg) zinc can interfere with magnesium absorption more noticeably. The reverse (magnesium blocking zinc) appears to be less of a concern at typical supplemental levels.

When to separate them

Consider taking zinc and magnesium at different times if:

• You're taking high-dose zinc (40mg+) for a specific purpose like immune support or acne
• You're taking high-dose magnesium (400mg+) for sleep or muscle recovery
• You want to maximise absorption of both minerals
• You're addressing a confirmed deficiency in either mineral and need optimal uptake

A simple approach: zinc with dinner, magnesium before bed. This naturally separates them by a couple of hours and puts each in its ideal timing window.

When it's fine to take them together

For most people taking standard doses:

• ZMA supplements (zinc + magnesium + B6) are a popular combination product precisely because the doses are moderate and the practical interference is small
• If you'd rather take everything at once than risk forgetting a second dose, taking them together is better than not taking one at all
• The absorption difference at moderate doses is marginal, perhaps 10-15%, not dramatic enough to worry about if convenience matters to you

The copper factor

A more important concern than zinc-magnesium interaction is the zinc-copper relationship. Long-term zinc supplementation (30mg+ daily) can deplete copper levels, leading to:

• Fatigue and weakness
• Immune dysfunction (ironically, the opposite of why people take zinc)
• Neurological issues in severe cases

If you take zinc daily, consider adding 1-2mg of copper, but at a different meal, since zinc and copper also compete for absorption.

Practical recommendations

For most people: take them together if it's convenient. Standard doses of 15-25mg zinc and 200-400mg magnesium don't meaningfully compete.

For those optimising absorption: take zinc with dinner and magnesium glycinate before bed. You get the benefits of both without any absorption compromise, and the timing works in your favour (magnesium aids sleep, zinc supports overnight recovery).

Don't forget copper: if you're taking zinc daily at 30mg or above, supplement 1-2mg copper at a separate meal.

The bottom line

The zinc-magnesium competition is real but modest at normal supplement doses. Separation helps if you're taking high doses or correcting a deficiency. For most people, consistency matters more than perfect timing. Take both daily in whatever routine you'll actually stick to.