View clinical trials related to Vitamin D Status.
Filter by:The present cross-sectional observational study was conducted after the university ethical committee approved the research (NU/CEC/2020/0339). This study included 376 adults in the age group of 18-40Yrs. The patient information sheet briefed the study details and usage of salivary samples. Informed consent was obtained from participants. Healthy individuals free of associated systemic conditions, individuals not under any nutritional supplementation were included in the study, and lactating mothers, smokers, and menopausal women were excluded
Background: Dietary intake of vitamin D includes vitamin D3 (VitD3), 25-hydroxyvitamin D3 (25OHD3) and vitamin D2 (VitD2). However, the bioactivity of the different species is currently not scientifically established. Objective: The aim of this study was to test the hypothesis that VitD3, 25OHD3 and VitD2 affected vitamin D status equally in humans and if rejected, to estimate the difference in activity. Design: This study was designed as a 3 x 6 weeks (with 4 weeks run-in) double-blinded randomized cross-over study with 12 young, apparently healthy male volunteers and was performed during wintertime at 55 degree N. during the 4 weeks run-in period all volunteers received 10 ug/d VitD3 in order to achieve steady-state in vitamin D status. During the 3x6 weeks intervention periods the subjects received 10 ug/d VitD3, 10 ug/d 25OHD3 or 10 ug/d VitD2 in random order. Content of vitD3, VitD2, 25OHD3 and 25-hydroxyvitamin D2 (25OHD2) in serum were quantified my LC-MS/MS using 0.1 mL serum.
People living at Northern latitudes are at risk of suffering from vitamin D insufficiency due to low sun exposure and the risk may be even more pronounced among elite swimmers since indoor training further reduces sun exposure. In light of this, the investigators want to examine vitamin D status in young elite swimmers and if there is an association between vitamin D status and muscle strength.
Vitamin D has effects on many tissues, and hypovitaminosis D is frequent. In a French survey conducted among 1587 adults, vitamin D insufficiency (<30ng/ml) has been reported in 80% of subjects, including 43% with moderate deficiency (<20ng/ml) and 5% with severe deficiency (<10ng/ml). Because of the possible consequences of hypovitaminosis D (osteomalacia in adults…), the number of vitamin D determination has increased ten-fold since 2005 in France, reaching 4.5 million € in 2011, and with it the costs for health insurance. However, there is currently no consensus on the strategy for detection, diagnosis and treatment of hypovitaminosis D. We propose to develop a predictive clinical score of hypovitaminosis D based on the accurate assessment of solar exposure, vitamin D intakes and hypovitaminosis D risk factors collected through a self-administered questionnaire.
The aim of the study is to compare the effectiveness of a vitamin D3 oral spray solution with capsules at raising vitamin D status over winter. This randomised crossover trial will aim to recruit a total of 22 healthy participants for a total of two 4-week interventions separated by a 10-week washout.
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.
Hypothesis: Six weeks of supplementation with vitamin D (4000 IU/day) using Dole's Vitamin D Portobello Mushroom Powder will increase winter serum vitamin D levels, and improve muscle function and strength, and innate immunity (granulocyte/monocyte phagocytosis and oxidative burst activity), and attenuate exercise-induced muscle damage and DOMS.
The study is a randomized, controlled, double blinded study evaluating the effect of recommended (400 IU) and 1 200 IU daily vitamin D substitution, given from 2 weeks to 2 years of age, on growth, bone development, neurologic and cognitive development, frequence of infectious diseases, allergic symptoms, and development of immunoregulation assessed at 2 years of age.
Infertility is a common and psychologically devastating problem for 20% of Canadian couples. Approximately, 20% of infertile couples are diagnosed with unexplained infertility and left without an explanation for their inability to have a baby. Pathological uterine receptivity and embryo implantation are hypothesized mechanisms underlying sub-fertility in these couples. Embryo implantation requires a complicated sequence of events involving the differentiation of endometrial cells to attain uterine receptivity and the synchronized interaction between maternal and embryonic tissues. Vitamin D has been hypothesized to play a role in this poorly understood process. Vitamin D is a known regulator of signal transduction pathways involved in embryo implantation and its receptors are involved in calcium-regulation in various reproductive tissues including, the ovary, uterus, and placenta. In Canada, the prevalence of Vitamin D insufficiency is approximately 34-50%. The goal of the proposed study is to determine the prevalence of vitamin D insufficiency in an infertile population and whether this prevalence is higher than in average Canadian reproductive age women. More importantly, we will investigate whether vitamin D insufficiency in our infertile population translates to impaired implantation and reduced clinical pregnancy rates. Insight into vitamin D's role in reproduction is essential not only to provide scientific understanding of the mechanism underlying embryo implantation, but also because vitamin D supplementation could provide an easy and safe means of treating infertility.
The purpose of the study is to determine the frequency of UVB radiations necessary to maintain the Vitamin D level during winter time.