Vitamin D Deficiency and Medically Assisted Reproduction

Vitamin D is a fat-soluble vitamin and a steroid hormone that plays a key role in the regulation of calcium homeostasis and bone health. However, vitamin D system also regulates the expression of several genes (3% of human genome) involved in cell differentiation and cell cycle control and has multiple pleiotropic functions on extra-skeletal target tissues, such as immune and cardiovascular system, pancreatic endocrine cells, muscle, and adipose tissue.