ZMA supplements
3 interactions related to ZMA supplements
vitamin d + magnesium
Magnesium helps activate and support the function of vitamin D; low magnesium can reduce the effectiveness of vitamin D supplementation. This is a beneficial nutrient synergy rather than a harmful interaction.
iron + zinc
High-dose iron and zinc supplements can compete for absorption in the small intestine when taken together, especially in solution on an empty stomach, potentially reducing the effectiveness of one or both minerals. The competition is minimal when the minerals are taken with food or hours apart, or at ordinary dietary amounts.
magnesium + zinc
At high supplemental doses, zinc and magnesium can each modestly reduce the other's absorption in the gut — and the better-documented direction is zinc lowering magnesium absorption, not the reverse. The effect is minor and dose-dependent; ordinary multivitamin amounts rarely matter.