evidence: This hormone binds with hundreds of sites throughout the body that have vitamin D receptors, and thereby affects how many of our genes are expressed. [...] Other countries, like the United Kingdom, may provide this number in nanomoles per liter (nmol/L), resulting in a number that is about 2.5 times higher (48 ng is 120 nmol/L). According to the NIH, levels greater than 20 ng/ml are "generally considered adequate for bone and overall health in healthy individuals,"23 but other researchers or advocates, such as the Vitamin D Council, advocate a higher number—50 ng/ml or more.