Calcium deficiency can lead to the development of over 160 diseases & absorption is the key to effectively supplying calcium to the body. This pdt is extracted and purified from naturally growing algae. This pdt is formed into a liquid calcium pdt containing 73 necessary minerals substances for human health and having a PH VALUE OF 7.0, Algae calcium soft capsules exert no stimulation upon the gastrointestinal tract. Out of all calcium - supplement pdt, this pdt is the easiest to digest.