Ferrous sulfate is a widely available iron supplement. This form delivers a high amount of elemental iron at a low cost, helping the body make red blood cells and maintain energy when iron stores are low.
Take it with a meal and pair it with vitamin C to boost absorption. If your stomach handles it, taking it on an empty stomach can improve uptake even more. People mainly use it to correct low iron levels and to support energy in those with iron deficiency.
It can cause stomach upset, nausea, constipation, or dark stools. Ferrous sulfate may interfere with certain antibiotics (tetracyclines, quinolones) and thyroid medications, lowering their absorption. Keep this supplement out of reach of children. An overdose is toxic and requires immediate medical attention.