A review of normal calcium and phosphate homeostasis, including discussion of vitamin D metabolism and the actions of PTH, as well as brief mention of the newly discovered role of FGF23. calcidiolcalcitonincalcitriolcalciumcholecalciferolergocalciferolfgf23fibroblast growth factor 23homeostasisMetabolismnutritionparathyoid hormoneParathyroidphosphatephysiologyPTHvideoVITAMINVitamin Dvitamin nutritionvlogYouTube