A combination of vitamins D3 and K2 may offer enhanced benefits for bone and cardiovascular health, according to some research. A review published in the International Journal of Endocrinology highlights a synergistic interplay between these two fat-soluble vitamins, which play a crucial role in calcium metabolism.
Vitamin D3 is understood to promote the production of vitamin K-dependent proteins. These proteins require vitamin K, specifically K2, for a process called carboxylation to function properly. In essence, vitamin D3 aids the body in absorbing calcium, while vitamin K2 helps direct that calcium to the bones, potentially preventing its buildup in arteries.
Some supplement formulas now combine both vitamins in a single capsule to support this absorption process. One such product, Sports Research D3 + K2, is described as a plant-based formula designed to support bone strength, immune function, cardiovascular health, and healthy calcium metabolism. It combines dosages of Vitamins D3 and K2, with coconut MCT oil added to aid absorption.
This particular formula has garnered numerous positive reviews, with some users reporting benefits beyond those typically associated with single-vitamin supplements. One user shared that after taking the supplement for about a month, they experienced an improved disposition and reduced bone aches. They also noted the inclusion of vitamin K for immune system support, describing the combination as a "win-win situation."
Each daily softgel of the Sports Research product contains 125 mcg (5000 IU) of vegan Vitamin D3 derived from lichen and 100 mcg of Vitamin K2 (MK-7) from fermented chickpeas. The product is also third-party tested, non-GMO project verified, and NSF gluten-free certified.
According to combined U.S. retail data for Amazon and internal U.S. club channel sales from the previous year, this product is noted as the No. 1 selling D3 + K2 brand.