Studies show pale skin absorbs vitamin d six times faster than darker skin... African Americans are supposedly severely deficient in vitamin d. But it's been noted in several different studies that black ppl have higher serum 1,25-dihydroxyvitamin D, and higher calcium absorption and retention than Whites.
Once vitamin D is produced in the skin or consumed in food, it is converted in the liver and kidney to form 1,25 dihydroxyvitamin D, (1,25(OH)2D) the physiologically active form of vitamin D. This metabolically active form of vitamin D is known as calcitriol. Following this conversion, calcitriol is released into the circulation, and by binding to a carrier protein in the plasma, vitamin D binding protein (VDBP), it is transported to various target organs.
So why do black people show higher levels of the active form of vitamin d?
Also researchers doing a study on osteoporosis say black women may not need as much vitamin d as white women. The African American population have stronger bones and tend to have greater bone density than other ethnic groups and Caucasians.