When it converts to a vitamin D precursor in our skin through a chemical process, it then travels through our bloodstream and gets metabolized in the liver and to the kidneys, turning it into an active form of vitamin D, or a hormone called Calcitriol (or 1,25-dihydroxyvitamin D), also called ergocalciferol(vitamin D2), cholecalciferol (vitamin D3), or calcidiol
Alpha hydroxylase is present in the lung epithelium which is capable of converting calcidiol
to calcitriol; and this is thought to interfere in the synthesis of different cytokine i.
The reaction first occurs in the liver and converts vitamin D to 25-hydroxyvitamin D [25(OH)D], also known as calcidiol
Vitamin D deficiency is defined as serum calcidiol
levels below 25 ng m[L.
In this group the most important compounds in humans are ergocalciferol (vitamin D2) and cholecalciferol (vitamin D3)  The biologically active vitamin D is formed in the kidneys by the conversion of a part of calcidiol
into calcitriol , that is released into the circulation.
US: Very low 25 (OH)D = calcidiol
<20 ng/ml 36% aged 18-29.
Debemos de dar una intervencion temprana con administracion de calcio asi como calcidiol
que son economicos y que impactan de forma directa en la evolucion de osteopenia a osteoporosis.
5] Kidneys convert some amount of calcidiol
to calcitriol, which is the biologically active form of vitamin D and also known as 1,25-dihydroxy vitamin D [1,25[(OH).
7 mg/dL), increased parathyroid hormone (95 pg/mL), and low calcidiol
Researchers speculate that vitamin D supplements might reduce the degree of chronic pain in people with low levels of calcifediol (also known as calcidiol
, a marker of vitamin D levels in the body).
000 IU per week intramuscularly for 3 weeks, 1 gg alpha calcidiol
and 1000 mg elemental calcium plus 880 IU vitamin D3 per day orally.
The synthesis of four isomers at C23 and C25 of calcidiol
lactone was accomplished by the stereo-specific iodolactonization or selenolactonization of the trans-andcis-[[DELTA].