NOW Foods Vitamin D-3 & K-2 combines two essential fat-soluble vitamins that work synergistically to support healthy bones, cardiovascular function, and immune response. Vitamin D-3 (cholecalciferol) is the most bioavailable form of vitamin D and is critical for calcium absorption, while Vitamin K-2 (as MK-7, the most active form) directs calcium into bones and away from arteries — preventing the arterial calcification that can occur when D-3 is taken alone. Each softgel delivers 1,000 IU of D-3 alongside 45 mcg of K-2 (MK-7) in a convenient, once-daily dose. NOW Foods tests every batch in their own GMP-certified laboratory to guarantee identity, potency, and purity — so you get exactly what the label states, every time.