Vitamin K2, a lesser-known but equally vital nutrient, belongs to the family of vitamin K compounds primarily involved in blood coagulation. While vitamin D3 boosts calcium absorption from the gut, vitamin K2 ensures that the calcium is directed to the bones rather than arterial walls. Combined Formulations: Look for supplements that deliver vitamin D3 and K2 together in clinically proven doses (e.g., 1000-2000 IU D3 with 90-120 mcg K2 as MK-7). Look for supplements that deliver vitamin D3 and K2 together in clinically proven doses (e.g., 1000-2000 IU D3 with 90-120 mcg K2 as MK-7). Vitamin D3 and K2 are critical for keeping our bones strong and our hearts healthy by ensuring calcium metabolism is properly regulated.