Is ferrous gluconate the same as ferrous sulfate? Ferrous gluconate is available in 100 mg doses, and it can be taken with or without food. Additionally, there are 8 mg iron tablets and ferrous fumarate, which is priced at 210 mg. It’s important to note that while considering iron supplements, some people might wonder, does calcium citrate cause kidney stones? This question often arises for those who are concerned about the potential side effects of various supplements. In summary, while ferrous gluconate and ferrous sulfate serve similar purposes as iron supplements, it’s crucial to be aware of the implications of other supplements like calcium citrate, especially regarding kidney stones. So, does calcium citrate cause kidney stones? It’s a question worth exploring for anyone considering their nutritional intake.