Pharma nord bio calcium and d3 and k 500mg 150 tablets bio calcium d3 k 150 capsules what is calcium calcium is the most abundant mineral in the human body which contains approximately 12 kg 99 of which is stored in bones and teeth with the remaining 1 present in the blood and other bodily tissues calcium cannot be absorbed from the digestive system without vitamin d which is made in the skin in response to sunlight vitamin k promotes the uptake of calcium into bone tissue