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.
What Can Vitamin and Mineral Supplements Do for Your Health? When the food on the plate falls short and doesnât include essential nutrients like calcium, potassium, vitamin D, and vitamin B12, some of the nutrients many Americans donât get enough of, a supplement can help take up the nutritional slack.