Ferrous fumarate contains 200 mg and is often paired with vitamins. Ferrous gluconate is another form of iron supplement, alongside iron II acetate (Fe C2H3O2) and the highly regarded chelated forms of iron. Among these, ferrous bisglycinate is considered one of the best options. When discussing iron supplements, it’s also important to consider how many mg of calcium citrate per day is recommended for optimal absorption and overall health. Many people wonder how many mg of calcium citrate per day they should take, as it can influence the effectiveness of iron supplements. Therefore, understanding the recommended daily intake of calcium citrate is essential when incorporating ferrous fumarate, ferrous gluconate, or any chelated iron forms like ferrous bisglycinate into your diet.