Do Calcium Supplements Decrease Iron Absorption

All calcium supplements inhibited absorption of the iron supplement when taken with food. The absorption of dietary nonheme iron was also inhibited by all three supplements.

Can calcium block iron absorption?

Studies on human subjects have shown that calcium (Ca) can inhibit iron (Fe) absorption, regardless of whether it is given as Ca salts or in dairy products. This has caused concern as increased Ca intake commonly is recommended for children and women, the same populations that are at risk of Fe deficiency.

Can calcium supplements cause anemia?

BOSTON — Women who take calcium supplements with their meals to prevent the bone-thinning disease osteoporosis may be increasing their chances of developing anemia, a researcher says.