A complete safety, timing, and dosage guide for combining Iron (Ferrous Sulfate, Ferrous Bisglycinate) with Manganese — including how the two supplements interact, the best time of day to take each, and which populations should be careful.
Yes, you can take iron (ferrous sulfate, ferrous bisglycinate) and manganese together — they do not have a significant interaction and are safe to combine.
Iron (ferrous sulfate, ferrous bisglycinate) and manganese together are safe to combine, with no clinically significant interaction. They may share intestinal absorption pathways, but at typical supplement doses this does not cause meaningful nutrient depletion. You can take them as part of your daily routine without concern.
Iron and manganese are both divalent cations that use the intestinal transporter DMT1 (divalent metal transporter 1) for absorption, so a very large dose of one could theoretically reduce uptake of the other. However, at standard supplement doses, the competition is minimal, and your body maintains manganese balance primarily through biliary excretion rather than absorption control. Ferrous sulfate is an inorganic iron salt that relies on DMT1 and is sensitive to dietary inhibitors like phytates and calcium, while ferrous bisglycinate is a chelated form that uses a different uptake mechanism to a greater degree, making it less likely to interfere with manganese. Manganese does not share the same post-absorption transport proteins as iron, so once absorbed, they do not meaningfully compete. For this reason, taking them together is considered safe with no need to separate doses unless you want to be extra cautious.
If you need both iron and manganese, you can take them at the same time with a meal, as the interaction is negligible at typical doses. For optimal absorption, take iron on an empty stomach if tolerated, with a source of vitamin C, and avoid calcium, coffee, or tea for an hour before and after. Manganese can be taken with food to prevent nausea, and there is no need to separate it from iron unless you are taking a high-dose iron supplement (above 25 mg of elemental iron). If you separate them, take iron in the morning and manganese in the evening, at least 2 to 3 hours apart. If you miss a dose, take it as soon as you remember unless it is almost time for your next dose, and never double up.
The form of iron matters more than the form of manganese in this combination. Ferrous bisglycinate is chelated and typically better absorbed than ferrous sulfate, with fewer gastrointestinal side effects, and it is less likely to interfere with manganese uptake because it does not depend as heavily on DMT1. Manganese is commonly found as manganese sulfate, gluconate, or citrate, and these forms all appear to be adequately absorbed; no specific manganese form is significantly better in the context of iron supplementation. If you take a high-dose iron supplement, separating it from manganese by a few hours may minimize any theoretical absorption competition.
Iron and manganese are frequently included together in multivitamins and prenatal supplements, often alongside copper, zinc, and vitamin C. They are less commonly combined in targeted bone health formulas, which usually pair manganese with calcium, magnesium, and vitamin D.
Yes, you can take iron and manganese at the same time. At typical supplement doses, they do not interfere with each other meaningfully. If you are taking a high-dose iron supplement, you can space them by a couple of hours for extra peace of mind.
Yes, it is safe to take this combination every day as long as the total dose of each mineral is within the recommended limits. Most multivitamins include both at safe levels. Just avoid exceeding the tolerable upper limit for manganese (11 mg/day) and the recommended iron dose for your needs.
You do not need to wait at all between iron and manganese. If you want to minimize any theoretical absorption competition, waiting 2 to 3 hours is more than enough.
Yes, to a small degree, because they both use the intestinal transporter DMT1. However, at typical supplement doses, this competition is minor and rarely causes a deficiency. Ferrous bisglycinate is less likely to compete than ferrous sulfate because it has its own chelated absorption pathway.
You should avoid this combination if you have a liver condition that affects bile flow, because manganese can build up in your body. People with iron overload conditions like hemochromatosis should not take iron supplements at all. If you have kidney disease or a history of mineral imbalances, check with your doctor first.
I recommend taking iron on an empty stomach for best absorption, but if it bothers you, take it with food and some vitamin C. Manganese can be taken with food to prevent stomach upset, and it does not matter whether it is the same meal as your iron.
Reviewed by Caroline M. on April 7, 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.