Ferrous fumarate contains 210mg of iron, while ferrous gluconate should be taken with milk. The conversion of ferrous fumarate to ferrous sulfate is an important process, and iron chelate provides 30mg of iron. How much iron is present in ferrous fumarate 210mg? It’s essential to consider the benefits of calcium citrate with vitamin D chews, as they can enhance nutrient absorption. Including calcium citrate with vitamin D chews in your regimen is beneficial, especially when taking iron supplements like ferrous fumarate. Additionally, combining these supplements can help maximize the overall effectiveness of your dietary intake.