View clinical trials related to Vitamin D Deficiency.
Filter by:The purpose of this study is to evaluate the effect of anemia correction and vitamin D supplementation in kidney transplant recipients.
Historically, vitamin D has been considered to play a role solely in bone and calcium metabolism. Numerous studies have suggested a link between vitamin D deficiency and adverse health outcomes such as malignancy, cardiovascular disease, immune functioning, and glucose metabolism. In the obstetrics literature, vitamin D deficiency has been linked to preeclampsia, gestational diabetes, and increased rate of cesarean section rate. Recent data from retrospective chart reviews have demonstrated a possible role of vitamin D in implantation and clinical pregnancy rates in patients undergoing in-vitro fertilization. Patients found to be deficient in vitamin D were found to have significantly lower clinical pregnancy rates when compared to patients who were replete in vitamin D levels. Currently, there are no prospective clinical trials investigating the effects of vitamin D supplementation on IVF outcomes such as clinical pregnancy rate and implantation rates. The investigators hypothesize that the vitamin D supplementation in patients found to be either deficient or insufficient in vitamin D will lead to improved pregnancy rates in infertility patients undergoing in-vitro fertilization.
This study will test the hypothesis that 6 months of periodic high dose Vitamin D3 replacement (200,000 and 100,000 units cholecalciferol, oral liquid drops at 6 to 8 week intervals) followed in-between by daily 1000 units, decreases insulin resistance by HOMA2-IR ≥ 0.36, in comparison to control, standard dose Vitamin D3 1000IU/ day for 6 months, in south Asians with both Vitamin D deficiency (defined as 25 Hydroxy vitamin D < 25nmol/l) and insulin resistance (defined as HOMA1 -IR≥ 1.93). The hypothesis formed suggests that insulin resistance developed in South Asians is explained, at least in part, by the presence of Vitamin D Deficiency (VDD). Therefore if the VDD is reversed/ 'normalised into target range' using Vitamin D therapy in individuals at risk of diabetes, then markers of insulin resistance should reduce from baseline values. However, current UK recommended doses of Vitamin D do not adequately replenish severe VDD, common in South Asians, back into the target range and therefore will not reduce insulin resistance markers. Therefore only higher pharmacological doses are able to replace severe Vitamin D deficiency adequately and improve insulin resistance markers.
Atopic dermatitis is a chronic skin disease characterized by a defective skin barrier, inflammation, and increased propensity for skin infections. Vitamin D is a fat-soluble vitamin that is primarily acquired through local production in the skin after ultraviolet light exposure but can also be obtained through natural and supplemental dietary sources. This randomized controlled trial will examine the effects of vitamin D repletion on atopic dermatitis severity in patients with diagnosed deficiency. The investigators hypothesize that pediatric patients with moderate or severe atopic dermatitis and vitamin D deficiency will have improved cutaneous disease after treatment with high dose as compared to standard dose vitamin D.
The prevalence of vitamin D deficiency increases as kidney function declines. As a result, many hemodialysis patients often have low levels of vitamin D. Recent evidence has shown that vitamin D supplementation may improve many aspects of poor health such as heart disease and inflammatory markers. The objectives of this study are to determine how supplementing dialysis patients with ergocalciferol increases vitamin D levels, how long vitamin D levels can be maintained after a 6 month treatment course, and to examine the effect of ergocalciferol on biomarkers of inflammation and vascular health.
Atopic dermatitis is a chronic skin disease with pruritus as one of its main features. Because of the symptomatic nature of their condition, pediatric patients with atopic dermatitis may preferentially seek care in the subspecialty dermatology clinic while falling behind in visits to their primary care provider. This cross-sectional study in patients attending the Dermatology Clinic at Children's Hospital of Wisconsin will screen for common conditions associated with atopic dermatitis and subsequently treat or refer patients for appropriate care. The investigators hypothesize that Milwaukee County pediatric patients with atopic dermatitis will have a high prevalence of asthma needing treatment, missed immunizations requiring catch-up, and vitamin D deficiency necessitating replacement therapy.
The main aim of the investigation is to clarify, whether vitamin D supplementation in coronary artery disease patients with vitamin D deficiency and postchallenge hyperglycemia has an impact on endothelial dysfunction and parameters of insulin sensitivity and beta-cell function.
Vitamin D status has been negatively associated with the presence of type II DM and glycemic control. However, a cause-effect relationship between vitamin D deficiency and glycemic control has not been established. The investigators plan to conduct a double blind, randomized, placebo controlled trial on the effect of vitamin D supplementation on glycemic control in Type II DM.
The purpose of this study is to examine the effects of Vitamin D supplementation on the reasons (mechanisms) underlying the development of type 2 diabetes, metabolic syndrome (high blood pressure, cholesterol, diabetes, body weight/obesity), muscle weakness and wasting (sarcopenia), and impaired physical function (poor balance and walking) associated with vitamin D deficiency and osteopenia/osteoporosis (bone loss). The investigators obtain vitamin D through our diet and sunlight, and its conversion to active vitamins in the liver and kidneys promotes the intestinal absorption of calcium and regulation of bone growth. Therefore, vitamin D deficiency has been known for years to lead to weakened bones (osteopenia and osteoporosis). However, more recently, studies show vitamin D deficiency is associated with a number of other diseases, including type 2 diabetes, muscle weakness, frailty, and the metabolic syndrome. It has also been associated with cognitive impairment. Diabetes affects multiple organ systems including the heart, kidneys, musculoskeletal and nervous system. The possibility that vitamin D deficiency is linked to the development of type 2 diabetes, metabolic syndrome, muscle weakness and wasting (sarcopenia) and osteopenia/osteoporosis, and that vitamin D supplementation decreases the risk for these diseases, provides a relatively easy/accessible and inexpensive model of preventive therapy to decrease the incidence of these diseases. In addition, it is likely that genetic (inherited) factors play a role, but the relationship of these genes to these metabolic abnormalities have not been elucidated. Understanding the role of Vitamin D in health will allow us to translate these findings into therapy.
IBD is caused by an abnormal immune response to the gut bacteria in people who are genetically predisposed. There has been a huge increase in the number of people diagnosed with IBD since World War II, likely due to changes in our environment. It is possible that the abundance of vitamin D in the body may be one of those environmental factors that the investigators can control to make patients with IBD better. Vitamin D acts on cells of the immune system and causes many effects, including the production of a "natural antibiotic" called cathelicidin. The investigators know that when people are supplemented with vitamin D, levels of cathelicidin produced by these immune cells increase. By supplementing children with Crohn's disease with vitamin D, the investigators may be able to alter their immune system "naturally," making their disease better. A consensus of vitamin D experts believes that vitamin D levels need to reach a level of 40-70 ng/mL in the blood in order to have effects on the immune system. Raising vitamin D levels to this range is one of the goals in the current study.