Tropical Oasis Liquid Calcium Citrate and Magnesium is a supplement that your body can use. Buying dense calcium pills that your body can't process and absorb is worthless to your body and a waste of your money. Calcium deficiency results largely from poor absorption. You may intake enough calcium, but if your body can't absorb it, you can still become deficient. Remember that your body can only absorb minerals that are "ionized." Remember that your body can only absorb minerals that are "ionized."