Vitamin D — K2 Liquid Vitamin D is essential throughout all stages of life. In order to maintain an optimal level of vitamin D, from fetal development to old age, taking a vitamin D supplement can be beneficial. It provides these benefits: \tVitamin D helps supports your overall health \tBoosts muscle and bone health \tSupports your cardiovascular and immune function. This powerful formula combines vitamin D as well as vitamin K2 — a series of molecules known as menaquinones— exert a powerful influence on bone health. The most common and well-studied of these menaquinones is known as MK-4. Vitamin K is essential for normal cell formation and to help maintain a healthy cardiovascular system. When combining vitamins D and K, the mix could provide huge benefits and protection of your overall health and bodily systems. In one study in postmenopausal women, it was found that a combination of minerals — along with vitamins D and K — helped maintain healthy artery elasticity, compared to two other groups of women who did not receive the mixture of vitamin D and K. What is our favorite combination? Thornes' Vitamin D / K2 Liquid. It is a medium-chain triglyceride oil, preserved with mixed tocopherols, that's easily added to any routine.