These oval-shaped little nuts just may hold the key for many to get more calcium in their diets. In fact, this nut is the richest source of calcium out of all the nuts coming in at 23 milligrams of calcium in just one serving. What makes the nutrition-rich almond even more desirable is its high level of vitamin E, with one serving providing 15 percent of the RDA for vitamin E. But the goodness of almonds doesn’t stop there. Almonds are also a valuable source of protein. So if you don’t eat meat, be sure to stock up on almonds.