Everything you’ve been told about calcium probably started with a milk mustache. But is dairy really the best source of calcium, or even a necessary one? Do calcium supplements protect your bones, or could they harm your heart? And why do some countries that barely touch dairy have the strongest bones of all? Discover what the science says about building strong bones for life, which foods deliver the most absorbable calcium, and how to know if you’re one of the people who truly needs a supplement.