Vitamin D, 25-Hydroxy

25-Hydroxy Vitamin D is the best measurement of vitamin D status. Vitamin D plays vital roles in cell differentiation, the process by which cells become specialized in specific roles. This is especially important for cells of systems in the body that multiply quickly or have multiple different types, like those in the gut, skin and immune system. Vitamin D also controls calcium homeostasis which means it has an impact on cognitive function, heart and bone health. Insufficient vitamin D can lead to a worsening of metabolism, and elevations in several stress hormones.