Ask most women what keeps their bones strong, and the answer comes back fast: calcium. But a woman can hit her calcium target every day and still lose bone if her vitamin D is low, her protein intake is thin, or her estrogen has dropped. Dr. Lindsey Cassidy breaks down what bone strength actually depends on — and why the menopause years change the math.

Americans spend $60 billion a year on supplements — and most of it doesn't work. Before you add another capsule to your morning routine, here's what the evidence actually says about supplements for women, and which ones are worth your money.