How many milligrams of ferrous gluconate should I take? I have been using ferrous sulfate at a dosage of 25 mg, and I’ve also considered ferrous fumarate and sodium ferric EDTA. Additionally, I am aware of the benefits of calcium citrate 600 and vitamin D 400. It’s essential to find the right balance of iron supplements like ferrous fumarate while also incorporating calcium citrate 600 and vitamin D 400 into my routine to support overall health. Thus, I need to determine the appropriate amount of ferrous gluconate to ensure I am meeting my nutritional needs alongside calcium citrate 600 and vitamin D 400.