“…1, 25-Dihydroxvitamin D3 (1, 25 (OH) D3) or vitamin D is one of the fat-soluble vitamins. It is mainly produced through UV radiation and conversion of 7-dehydrocholesterol to 1,25(OH)D3; although this vitamin is also obtained through diet such as: Oily fish, meat, milk products and fortified food products [ 7 , 8 ]. Generally has been agreed, that the least serum/plasma concentration of 25-hydroxyvitamin D (25(OH)D) is approximately 30 nmol/L to prevent vitamin D deficiency-related bone disease; hence this threshold is appropriate for defining vitamin D deficiency in population - based studies.…”