"CAL-VITAN GLUCOSAMINE to provide a rich source of calcium, magnesium and zinc which contribute to the maintenance of normal bone Vitamin D which helps with the normal absorption and utilisation of calcium by the body. CAL-VITAN Glucosamine contains the preferred D3 form of Vitamin D. Vitamin D3, also known as cholecalciferol, is the form of vitamin D that is produced by the skin on exposure to sunlight. D3 is the preferred form of vitamin D because it is the specific form made in the human body and therefore more effective than D2 which is found in some supplements. Cartilage health Vitamin C contributes to normal collagen formation for the normal function of bones and cartilage. CAL-VITAN Glucosamine also provides copper which contributes to the maintenance of normal connective tissues, plus Chondroitin and Ginger Root extract. Calcium is vital for older women Both sexes lose bone mass during their lifetime but after the menopause women usually lose bone mass much faster than men. Postmenopausal women have an increased risk of bone loss for three reasons: "