While vitamin D supplementation and exercise are recommended for prevention of falls for older people, results regarding these 2 factors are contradictory. In this randomized clinical trial, Uusi-Rasi and colleagues examined the effects of vitamin D and exercise on physical functioning, falls, and fall injuries among home-dwelling women aged 70 to 80 years. They found that neither treatment had an effect on the total number of falls, but exercisers had a reduced rate of injurious falls and improvement in physical functioning. Vitamin D did not affect the rate of falls or physical functioning, nor did it enhance exercise effects on physical functioning. LeBlanc and Chou provide an Invited Commentary.