Calcium may not be one of those snazzy supplements that get all the attention, but it does have some pretty impressive benefits. No doubt you’re aware of its impact on bone health, and you might also know that it can help keep you lean. But calcium also plays an important role in boosting levels of insulin-like growth factor-1. Research shows that higher intake of calcium is associated with higher IGF-1 levels. In addition, elevated levels of calcium also boost testosterone and increase the intensity of muscle contractions. The science is pretty clear: Calcium is truly the mineral for improving appearance — helping to increase muscle mass, reduce body fat and strengthen your underlying bone structure.