Ferrous gluconate is an excellent source of iron, commonly found in supplements. Other options include ammonium ferrous sulfate, ferrous sulfate, and ferrous fumarate, often combined with folic acid in tablets. When comparing the effectiveness of iron sources, many wonder which is superior: ferrous sulfate or ferrous fumarate. For those seeking a convenient way to boost their iron intake, the smallest calcium citrate pills also provide an additional benefit of calcium. Ultimately, individuals should consider their options, including ferrous sulfate and ferrous fumarate, while also exploring the smallest calcium citrate pills for a well-rounded nutritional approach.