Loading...
 
Toggle Health Problems and D

Vitamin D2 half-life about 13 days – April 2012

Plasma appearance and disappearance of an oral dose of 25-hydroxyvitamin D2 in healthy adults.

Br J Nutr. 2012 Apr;107(8):1128-37. Epub 2011 Sep 7.
Jones KS, Schoenmakers I, Bluck LJ, Ding S, Prentice A.
MRC Keneba, MRC Unit, PO Box 273, Banjul, The Gambia. kjones at mrc.gm

25-Hydroxyvitamin D (25(OH)D) half-life is a potential biomarker for investigating vitamin D metabolism and requirements. We performed a pilot study to assess the approach and practical feasibility of measuring 25(OH)D half-life after an oral dose. A total of twelve healthy Gambian men aged 18-23 years were divided into two groups to investigate the rate and timing of (1) absorption and (2) plasma disappearance after an 80 nmol oral dose of 25(OH)D2.

Fasting blood samples were collected at baseline and, in the first group, every 2 h post-dose for 12 h, at 24 h, 48 h and on day 15. In the second group, fasting blood samples were collected on days 3, 4, 5, 6, 9, 12, 15, 18 and 21. Urine was collected for 2 h after the first morning void at baseline and on day 15. 25(OH)D2 plasma concentration was measured by ultra-performance liquid chromatography-tandem MS/MS and corrected for baseline. Biomarkers of vitamin D, Ca and P metabolism were measured at baseline and on day 15.

The peak plasma concentration of 25(OH)D2 was 9·6 (sd 0·9) nmol/l at 4·4 (sd 1·8) h.
The terminal slope of 25(OH)D2 disappearance was identified to commence from day 6. The terminal half-life of plasma 25(OH)D2 was 13·4 (sd 2·7) d. There were no significant differences in plasma 25(OH)D3, total 1,25(OH)2D, parathyroid hormone, P, Ca and ionised Ca and urinary Ca and P between baseline and day 15 and between the two groups. The present study provides data on the plasma response to oral 25(OH)D2 that will underpin and contribute to the further development of studies to investigate 25(OH)D half-life.

{IMG(attId="1547" max='400")}{IMG}

Note: the graph is for the ACTIVE form of D2

PDF is attached at the bottom of this page
- - - - - - - - - - -

See also Vitamin D Life

Attached files

ID Name Comment Uploaded Size Downloads
1547 D2 half-life.jpg admin 16 Aug, 2012 21:06 21.21 Kb 3520
1546 D2 half-life - April 2012.pdf PDF admin 16 Aug, 2012 21:04 175.25 Kb 571
See any problem with this page? Report it (FINALLY WORKS)