The sunshine vitamin (vitamin D) gets an extra boost from vitamin K in this formula. Each drop contains 250IU of D3 and 30mcg of Vitamin K2, from MK-7 (menaquinone-7). Both these vitamins will support bone health and will help the body to absorb and hold onto calcium ? a mineral so critical for bone strength. This liquid formula is flavoured with a splash of aromatic orange making it a pleasure to take this bone-strengthening supplement.