Ostelin Cal-DK2 combines the essential mineral calcium with added vitamin D & K2 for strong bones. Many Austalians over the age of 50 have poor bone health. This convenient formula is suitable for people over 50 who want to support healthy bones, are deficient in vitamins D and K and calcium and for postmenopausal women. Benefits of Ostelin Cal-DK2: Contains a clinically trialled dose of vitamin K2 which may help postmenopausal women with bone loss. Convenient 1-a-day dose. Vitamin K2 triggers ostecalcin, a protein that regulates calcium, which is vital for bone formation and mineralisation. With high strength vitamin D3 to help promote calcium absorption.