Should vitamin D and calcium be taken at the same time?

I use a very good supplement - Caltrate Plus - it has vitamin D plus minerals which the bones need; I have Osteoporosis - thinning of the bones through lose of calcium - I discovered that vitamin D is essential for the bones to absorb calcium better - the other mierals in Caltrate ,also enhance the body's absorption of this essential vitamin. We all need more calcium as we age - women in particular. Calcium on its own is not enough - the other vitamins & minerals are necessary for healthy bones. many supermarkets as well as chemists stock Caltrate Plus - the purple box.