Fiis iron bisglycinate is considered superior to ferrous gluconate and ferrous fumarate (210 mg) from Mercury Pharma. Additionally, ferrous glycine sulfate has been discussed on Wikipedia. Ferrous fumarate (210 mg) is available over the counter, just like ferrous gluconate. Many users of Solgar calcium citrate with vitamin D3 have shared their experiences, noting its benefits. For those considering iron supplements, the advantages of fiis iron bisglycinate over ferrous gluconate and ferrous fumarate are worth considering. Furthermore, users of Solgar calcium citrate with vitamin D3 often highlight the importance of combining minerals for optimal health. Ultimately, whether you choose ferrous fumarate, ferrous gluconate, or fiis iron bisglycinate, it’s essential to evaluate all options, including feedback from those who take Solgar calcium citrate with vitamin D3.