title: Pharmacokinetics and effects of demographic factors on blood 25(OH)D3 levels after a single orally administered high dose of vitamin D3.
abstract: OBJECTIVE
  To examine the biological consequences and demographic factors that might affect the pharmacokinetics of vitamin D3 after a single high dose intervention in a young Chinese population with vitamin D insufficiency status.
  
  
  METHODS
  A total of 28 young subjects (25 to 35 years old) with vitamin D insufficiency status [serum 25(OH)D <30 ng/mL] was recruited in Shanghai, China. The subjects were orally administered a single high dose of vitamin D3 (300 000 IU). Baseline characteristics and blood samples were collected at d 0, 1, 2, 3, 7, 28, 56, 84 and 112 after the intervention. The blood biomarker levels were determined with standardized methods.
  
  
  RESULTS
  The intervention markedly increased the blood 25(OH)D3 levels within the first five days (mean Tmax=5.1±2.1 d) and sustained an optimal circulating level of 25(OH)D3 (≥30 ng/mL) for 56 d. After the intervention, body weight and baseline 25(OH)D3 levels were significantly correlated with circulating 25(OH)D3 levels. No adverse events and no consistently significant changes in serum calcium, creatinine, glucose, parathyroid hormone, vitamin D binding protein, or the urinary calcium/reatinine ratio were observed. However, there was a significant increase in phosphorus after the vitamin D3 intervention. Total cholesterol and triglyceride levels were decreased at the end of the trial.
  
  
  CONCLUSIONS
  The pharmacokinetics of vitamin D after intervention were influenced by baseline 25(OH)D3 levels and the body weight of the subjects. The results suggest that a single high oral vitamin D3 intervention is safe and efficient for improving the vitamin D status of young Chinese people with vitamin D insufficiency.
authors: Key Laboratory of Food Safety Research, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
authors: Pei-Zhan
authors: PZ
authors: Chen
authors: Key Laboratory of Food Safety Research, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
authors: Mian
authors: M
authors: Li
authors: Key Laboratory of Food Safety Research, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.|School of Life Science and Technology, ShanghaiTech University, Shanghai 200031, China.
authors: Xiao-Hua
authors: XH
authors: Duan
authors: Shanghai Clinical Center, China Academy of Sciences, Shanghai 200031, China.
authors: Jing-Ying
authors: JY
authors: Jia
authors: Key Laboratory of Food Safety Research, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
authors: Jing-Quan
authors: JQ
authors: Li
authors: Key Laboratory of Food Safety Research, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.
authors: Rui-Ai
authors: RA
authors: Chu
authors: Shanghai Clinical Center, China Academy of Sciences, Shanghai 200031, China.
authors: Chen
authors: C
authors: Yu
authors: China National Center for Food Safety Risk Assessment, Beijing 100022, China.
authors: Jun-Hua
authors: JH
authors: Han
authors: Key Laboratory of Food Safety Research, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.|School of Life Science and Technology, ShanghaiTech University, Shanghai 200031, China.|China National Center for Food Safety Risk Assessment, Beijing 100022, China.
authors: Hui
authors: H
authors: Wang
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000367:Age Factors; D002112:Calcifediol / Q000097:blood*; D002762:Cholecalciferol / Q000008:administration & dosage / Q000493:pharmacokinetics*; D005260:Female; D006801:Humans; D008297:Male; D012737:Sex Factors; D013997:Time Factors; D014808:Vitamin D Deficiency / Q000097:blood / Q000188:drug therapy; D014815:Vitamins / Q000008:administration & dosage / Q000493:pharmacokinetics*
chemical_list: D014815:Vitamins; D002762:Cholecalciferol; D002112:Calcifediol