Calcium: What It Is, Forms, Cautions, and Clean Brands

Calcium is an essential mineral. It supports strong bones and teeth.*

Forms and what to look for on the label

Carbonate has more calcium per pill but needs food to absorb. Citrate absorbs with or without food.

Before you take it

Your body absorbs about 500 mg or less at a time best, so split larger doses. It can interfere with absorbing iron, thyroid medication, and some antibiotics, so space them apart.