Clinical trials: 25-Hydroxyvitamin D Concentration
Low 25-hydroxyvitamin D Concentrations
A Pilot Study to Examine the Effects of Vitamin D Supplementation on Mitochondrial Bioenergetics in Older Adults
This pilot study is a 4-month open label trial in 15 older (65-89 yrs) men and women with initial 25(OH)D concentrations of 12-<18 ng/mL to explore the effect of increasing 25(OH)D concentrations to ≥30 ng/mL through vitamin D3…
- Trial name
- NCT02445066
- Testing
- Vitamin D3
- Where
- United States
- Volunteers
- 15 people
- Sponsor
- Wake Forest University Health Sciences
Vitamin D Deficiency, 25-Hydroxyvitamin D Concentration
Is Vitamin D2 Treatment-associated Decrease in 25(OH)D3 Level a Reciprocal Phenomena?
Several studies have demonstrated that D2 treatment is associated with a decrease in 25(OH)D3 level and therefore have proposed that D3 would be preferable in term of raising total 25(OH)D level.
- Trial name
- NCT03035084
- Testing
- Vitamin D3, Vitamin D2
- Where
- Saudi Arabia
- Volunteers
- 100 people, healthy volunteers welcome
- Sponsor
- King Faisal Specialist Hospital & Research Center
25-hydroxyvitamin D Serum Concentrations
Trial of Vitamin D Fortified Milk
Prevalence of VDD is high worldwide, even in sunbathed equatorial regions where it had not been suspected before. The most cost-effective method for reducing population-wide VDD is through fortification of commonly consumed…
- Trial name
- NCT01909622
- Testing
- Vitamin D, No vitamin D
- Where
- 2 sites in Colombia
- Volunteers
- 80 people
- Sponsor
- University of Michigan
Serum 25-hydroxyvitamin D Concentrations (25OHD)
Dietary Requirement for Vitamin D in Adolescents Aged 14-18 Years
It is known that low vitamin D status is a very common problem in the UK. It is also known that a lack of vitamin D availability has potentially serious health implications, especially with respect to bone and muscle function.
- Trial name
- NCT02150122
- Testing
- Vitamin D3
- Where
- United Kingdom
- Volunteers
- 120 people, healthy volunteers welcome
- Sponsor
- University of Surrey
25-hydroxyvitamin D Concentration (Vitamin D Status)
D-Light Intervention
Vitamin D insufficiency has become a global concern, with low vitamin D status associated with bone disorders, cardiovascular disease and certain cancers.
- Trial name
- D-Light (NCT02495584)
- Testing
- Fortified milk (10µg vitamin D3), 10µg vitamin D3 supplement
- Where
- United Kingdom
- Volunteers
- 52 people, healthy volunteers welcome
- Sponsor
- University of Ulster
Serum 25-hydroxyvitamin D Concentrations (25OHD)
The BreaD Study - Bio-availability of D2 Vitamin Present in Bread
Vitamin D3 is synthesized in skin exposed to ultraviolet-B-irradiation of sunlight. However, in Northern Europe, including Finland, exposure to sunlight is limited or non-existent in winter.
- Trial name
- BreaD_ODIN (NCT02525003)
- Testing
- Vitamin D2, Vitamin D3, Vitamin D2 fortified bread
- Where
- Finland
- Volunteers
- 41 people, healthy volunteers welcome
- Sponsor
- University of Helsinki
Serum 25-hydroxyvitamin D Concentrations (25OHD)
Marwo-D Research -Need for Vitamin D in Different Population Groups
Insufficient intake of vitamin D is a public health problem, affecting about 40% of the Finnish population in the winter. Vitamin D has a wide range of health effects: in addition to its effect on bone, it is known to affect…
- Trial name
- ODIN (NCT02212223)
- Testing
- Vitamin D3
- Where
- Finland
- Volunteers
- 147 people, healthy volunteers welcome
- Sponsor
- University of Helsinki