Previtamin D3 isomerizes in the skin in a heat-sensitive manner to vitamin D3 (cholecalciferol), which undergoes subsequent metabolism in the liver to calcifediol/calcidiol ([25(OH)D3]), and then - ...

gosh.nhs.uk Aim Assessment of the efficacy of vitamin D replenishment and maintenance doses required to attain optimal levels in boys with Duchenne muscular dystrophy (DMD). Method 25(OH)-vitamin D ...

The Vitamin D Blood Test (25-OH Vitamin D): Who ... and has an even greater risk for bone loss. Vitamin D3 seemed more effective than D2 at raising this important blood test.

"Oral Calcifediol Repletes Blood Vitamin D Concentration within 4 Hours" Oral or UVB-derived vitamin D3 takes a few days to convert into circulating 25-hydroxyvitamin D [25(OH)D; calcifediol].