Vitamin D Status Clinical Trial
Official title:
Determining the Effects of Race, Skin Colour and Genotype on the Response to Vitamin D Therapy
The investigators want to make sure that people get the right dose of Vitamin D treatment. They will therefore investigate how skin colour, body mass index, ethnicity, vitamin D binding protein and genetic variation affect the response to a standard course of vitamin D in young adults, as a prelude to further studies in younger children.
Status | Completed |
Enrollment | 60 |
Est. completion date | February 2015 |
Est. primary completion date | February 2015 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | Male |
Age group | 18 Years to 25 Years |
Eligibility |
Inclusion Criteria: - Healthy young male adults aged 18 25 years - Free from any condition affecting bone health, general nutrition, growth and glucose metabolism. Exclusion Criteria: - Subjects with any chronic illness involving the liver and kidney - Use of steroids, anticonvulsants or any medication that might affect calcium and vitamin D metabolism. - Potential participants who have made plans to travel abroad during the study period. |
Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Diagnostic
Country | Name | City | State |
---|---|---|---|
United Kingdom | Sheffield Children's NHS Foundation Trust | Sheffield | Sheffield (South Yorkshire district) |
Lead Sponsor | Collaborator |
---|---|
Sheffield Children's NHS Foundation Trust |
United Kingdom,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Other | Evidence of hypercalciuria | Spot urine calcium:creatinine ratio will be performed on second void fasting urine 1 week after dosing to reassure that no hypercalciuria has occurred in any subject. | Participants will be followed for the duration of the study, an expected average of 4 weeks | No |
Primary | Increase in serum 25 hydroxyvitaminD (25OHD) levels | Increase in serum 25OHD levels by at least 25 nmol/L in the majority of the participants, 4 weeks after administration of 150,000 units of vitamin D, according to genotype and ethnicity. | Participants will be followed for the duration of the study, an expected average of 4 weeks | No |
Secondary | Determine if dark skin colour or South Asian heritage reduces the increase in serum 25OHD. | Change in serum 25OHD 4 weeks after dosing with 150,000 international units(IU) of Vitamin D according to skin colour Change in urinary calcium:creatinine ratio at 1 week after dosing. Change in in serum calculated free vitamin D, calcium, PTH and alkaline phosphatase 4 weeks after dosing. |
Participants will be followed for the duration of the study, an expected average of 4 weeks | No |
Secondary | Change in serum calculated free vitamin D | Change in calculated 'free' 25OHD 4 weeks after dosing with 150,000IU of Vitamin D Change in urinary calcium:creatinine ratio at 1 week after dosing. Change in in serum calculated free vitamin D, calcium, PTH and alkaline phosphatase 4 weeks after dosing. |
Participants will be followed for the duration of the study, an expected average of 4 weeks | No |
Secondary | Determine if variation in Group specific component(GC) genotype is associated with variation in the increase in serum 25OHD. | Change in serum 25OHD levels according to GC Genotype | Participants will be followed for the duration of the study, an expected average of 4 weeks | No |
Secondary | Determine the extent of parathyroid hormone (PTH) suppression in relation to overall increases in total and free serum 25OHD | Extent of PTH suppression before and after dosing with 150,000IU of Vitamin D | Participants will be followed for the duration of the study, an expected average of 4 weeks | No |
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