Which mineral has the smallest daily requirement caluim ironphosphur or magnesium?

Among calcium, iron, phosphorus, and magnesium, iron generally has the smallest daily requirement. The recommended dietary allowance (RDA) for iron is about 8 mg for adult men and 18 mg for adult women, while the RDAs for calcium and phosphorus are higher, at around 1,000 mg and 700 mg, respectively. Magnesium's RDA is approximately 310-420 mg, depending on age and sex, which is also higher than that of iron.