EDTA is an artificial amino acid, and since body regards it as a foreign substance, body eliminates entire particle - heavy particle coated with EDTA.

The body can't tell that underneath coating is some material (iron mixed with carbon, perhaps) which body might be willing to keep even though it is harmful to body. So, this coated EDTA particle gets sent to kidney and you urinate it out into toilet. You just got rid of some heavy particles.

EDTA (ethylenediaminetetraacetic acid) is a common sequestrant and antioxidant which is a part of oral chelation. This oral chelation is added to foods, body care, and household products.

The oral chelation also occurs as disodium calcium EDTA, tetrasodium EDTA, and disodium dihydrogen EDTA. As a sequestrant, this oral chelation binds trace minerals such as copper, iron and nickel that may be in product. If not inactivated, these minerals will lead to discoloration, rancidity and textural breakdown. When added as an antioxidant, EDTA prevents oxygen from causing color changes and rancidity.