Casein & Gluten Free Hypoallergenic Dietary Supplement Kirkman offers calcium capsules with and without vitamin D at the request of physicians. Our Calcium with vitamin D capsule is hypoallergenic and does not contain additives. This product is part of our Bio-Max series that uses forms of nutrients that have clinically proven to be among the best absorbed and most highly bio-available. Our calcium capsules utilize calcium bis-glycinate amino acid chelate, which has been demonstrated to have superior absorption qualities.