Active clinical trials for "Vitamin D Deficiency"

Background: Polycystic ovary syndrome (PCOS) is as common as 5-10% of all women in Austria. PCOS women frequently present with metabolic disturbances, hyperandrogenism and infertility. New therapy concepts are warranted. In our recent pilot study, vitamin D (vitD) supplementation significantly improved glucose metabolism and fertility. However, the efficacy of vitD administration shows individual variability indicating endogenous influences on pharmacological effects. A recent genome-wide association study reported three loci (DHCR7, CYP2R1, and GC) associated with vitD insufficiency. Moreover, vitD receptor (VDR) gene variants have already been known to be associated with insulin resistance. Aim: To test the hypothesis that vitD is efficient in changing metabolic parameters in PCOS and non-PCOS women longitudinally and to generate data on pharmacogenetic effects of vitD related genetic determinants adjusted for environmental factors. Primary outcome: Change from baseline in AUCgluc after vitD treatment. Secondary outcome: To generate the hypothesis that changes in metabolic and endocrine parameters following vitD treatment are associated with vitD related gene variants. Methods: 150 PCOS women with 25-hydroxyvitamin D (cholecalciferol, [25(OH)D]) levels <30 ng/ml will be treated with vitD (20,000 IU/wk) or placebo in a 2:1 randomized controlled trial over 24 weeks and investigated for metabolic and endocrine parameters as well as vitD related genetic variants. In addition, 150 non-PCOS women with 25(OH)D <30 ng/ml will be treated with vitD (20,000 IU/wk) or placebo in a 2:1 randomized controlled trial over 24 weeks and investigated for metabolic and endocrine parameters as well as vitD related genetic variants. The response to vitD supplementation in both groups will be analysed according to genotype profiles. Significance: VitD might be a new therapeutic option without major side effects for PCOS patients. Exploring specific loci for pharmacogenetic vitD actions would open a new window for therapy modulation in PCOS and other metabolic diseases.

The incidence of type 2 diabetes mellitus and obesity is increasing at an alarming rate both nationally and worldwide. Accumulating evidence suggests that serum cholecalciferol levels may be inversely related to the prevalence of diabetes, insulin resistance and metabolic syndrome. However, to demonstrate a causal relation between vitamin D and glucose metabolism, evidence from randomized and adequately powered placebo-controlled intervention trials is needed.The trials available on the effect of Vitamin D supplementation are not conclusive. Hence, the purpose of this study was to conduct a double-blind randomized trial in Vitamin D deficient obese type 2 diabetic Emirati population to clarify the effect of vitamin D supplementation on glycemic control and obesity parameters.

Vitamin D (Vit D) status is an emerging risk marker of great interest in cardiovascular disease (CVD). Lower serum levels of Vit D are associated with both cardiac risk factors and prevalent cardiovascular disease. Vit D insufficiency remains very prevalent in free living populations in the United States especially in urban, and multi-ethnic low income Northern cities.To date, prospective randomized trials using Vit D supplementation to modify CVD risk and evaluate outcomes have not been performed. The investigators propose a double-blind, randomized wait-list control trial in subjects with Coronary Artery Disease (CAD) and Vit D deficiency with two specific aims. Specific aim 1 is to measure endothelial function using reactive hyperemia peripheral arterial tonometry (RH-PAT) before and after treatment with Vit D replacement therapy. Specific Aim 2 is to measure levels of inflammation before and after treatment with Vit D replacement therapy. These aims will test the hypotheses that Vit D repletion will improve endothelial function and reduce the levels of detectable inflammation in the plasma of these subjects.

To compare the efficacy of two high dose vitamin D3 regimens (5,000 IU daily vs. 50,000 IU weekly) used clinically for the treatment of vitamin D deficiency versus a low dose of vitamin D3 used for supplementation (1,000 IU daily) in a clinical sample of predominantly Hispanic and black adolescents with vitamin D deficiency [25(OH)D level <20 ng/ml] by assessing change in 25(OH)D levels before and after 8 weeks of treatment. To compare the effects of vitamin D repletion [25(OH)D level >20 ng/mL] on selected musculoskeletal, cardiometabolic and immune markers in predominantly Hispanic and black adolescents with vitamin D deficiency [25(OH)D level < 20 ng/mL]. Hypothesis 1: Increase in vitamin D level will be associated with improvement in musculoskeletal, cardiometabolic, and immune markers including blood pressure, waist circumference, musculoskeletal symptoms, asthma severity and hand-grip strength.

We would like to determine if vitamin D insufficiency exists in different ethnic groups, if it has an effect on bone mass and muscle function, if it has an impact on the function of the cells of the immune system, and if the functioning level of these systems can be improved by stabilizing the vitamin D levels to within normal limits.

This study aims to evaluate the effect of vitamin D3 supplementation on disease activity and quality of life in IBD patients deficient in vitamin D, and also help determine the optimal dose of vitamin D3 for them. Hypothesis: Supplementation of vitamin D3 in IBD patients with hypovitaminosis D can improve their quality of life and decrease IBD activity.

To determine the dose-response between the doses of vitamin D3 supplements and raised serum levels of 25(OH)D and also the dose of vitamin D3 required to achieve circulating 25(OH)D ≥ 75 nmol/L;

Vitamin D is important risk factor for developing multiple sclerosis (MS) and for disease progression. Patients with MS who had lower vitamin D levels were at increased risk for more clinical attacks and faster disease progression. It was also shown that patients with MS had lower vitamin D levels in serum than healthy controls. It is not clearly defined, which are the levels of vitamin D in serum, that are high enough to trigger immunomodulatory effect and are safe for patients. This double-blind randomized clinical trial was designed to compare impact of vitamin D supplementation in two different doses (1000 IU/day vs 4000 IU/day) in patients with relapsing remitting MS. The main goal of this trial is to compare dose response on vitamin D supplementation and to estimate more closely appropriate level of vitamin D in serum which triggers some of experimentally shown immunomodulatory actions.

Fibromyalgia is a disease that significantly decreases the quality of life of people who suffer from it, has great repercussions at the socio-economic level due to the incapacity it produces. It is characterized by generalized pain, fatigue, sleep disorders, psychological stress and mental alterations, besides presenting painful points in different parts of the body to physical examination. Having few effective treatments is necessary to explore new options in their management to improve the general conditions of the patient. Previous studies have shown that patients with fibromyalgia have had low levels of vitamin D in the blood, a favorable response from post-vitamin D supplementation has been seen. This vitamin has been associated with pain pathways and with increased The perception of the same when it is in smaller amount. We will select patients with Fibromyalgia diagnosis from the external consultation of Rheumatology of the University Hospital "Dr. José Eleuterio González "of the UANL, over 18 years old who have not been previously supplemented with vitamin D, will initially be measured in blood of vitamin D, in addition to calcium as a safety measure, we will have a group that will only receive placebo and Another that will be supplemented with 50 thousand units weekly for 12 weeks, we will apply a questionnaire that measures pain scale and another one that measures the impact of the disease in the daily life of the patient, this will be done in a beginning and at the end of the 12 weeks .

Vitamin D is part of the regular treatment regimen among patients after heart transplantation. Due to potential drug-drug interaction between vitamin D and everolmus, these patients are in increased risk for increased everolimus metabolism, potentially leading to under- immunosupression.