1 Visual acuity (sharpness) tests help your doctor find out if you have a problem that affects how well you can see. 2  They measure the eye's ability to see details at near and far distances. 3  The tests usually involve reading letters or looking at symbols of different sizes on an eye chart.
Amount of calcium. Elemental calcium is key because it's the actual amount of calcium in the supplement. It's what your body absorbs for bone growth and other health benefits. The Supplement Facts label on calcium supplements is helpful in determining how much calcium is in one serving.
While your body usually removes excess amounts of dietary calcium through urine excretion, taking too many supplements can cause calcium to build up in your bloodstream. Natural sources of calcium include cheese, low-fat milk and yogurt, broccoli, almonds, dark leafy greens, oysters, canned salmon and tofu.ypercalcemia. Calcium helps your muscles function properly. Although calcium supplements can help prevent a nutritional deficiency, excessive amounts may cause hypercalcemia, a condition that commonly causes muscle weakness.