This listing is for 1 unit. Deva Calcium Magnesium Plus provides all the key nutrients to guard against bone loss and helps maintain normal structure and development of bones. The calcium in this formula is in amino acid chelated form and for a reason: Since amino acids can be absorbed through the intestinal tract more efficiently than inorganic minerals, it is easier for high-quality chelated minerals to be absorbed and utilized by the body. This translates into improved absorption, increased tolerability and stability.