People tolerate doses of calcium supplements of up to 2000 mg. It was once thought that high levels of calcium supplementation could lead to an increase in kidney stones; however, a recent study showed that higher levels of calcium actually decreased the risk of kidney stones. In other words those patients who had the highest intake of calcium actually had the lowest risk of kidney stones.
Iodine supplementation greater than 750 mcg can suppress thyroid hormone secretion. Reports have also been made of acne-like skin eruptions at higher levels of iodine intake. With the iodized salts available in market. We are consuming Iodine well above this level thus suppressing our thyroid hormones functionality.