Supplements can help, but the best way is still through eating or drinking natural foods. The Almond milk Neanderthal mentioned is a very good way, as is eating Almonds. Veggies such as Bok Choy(Chinese Cabbage), and brocoli, are full of Calcium and easy for the body to absorb. Also, many people who are Lactose intolerant can eat Yogurt without the adverse effects, and yogurt is great; not only for the calcium, but also as a source of Acidopholullis.http://www.mayoclinic.com/health/lactobacillus/NS_patient-acidophilus, which our bodies require. The link Cj put up has some other very good suggestions.
a good supplement that has calcium as one of the featured elements. you know,the supplements that say they're good for osteo porosis and contain high calcium.make certain they are chelated. some supplements do have the stated amount of calcium,your system just can't absorb much of it. I hope it helps..