Active clinical trials for "Vitamin D Deficiency"

The objective of the study is to compare supplementation with vitamin D at 800 IU/day to usual care for the first 28 days after birth with respect to 25 (OH) vitamin D levels and indicators of likely or plausible effects of vitamin D supplementation on the function or structure of the lung, bones, immune system, and brain in extremely premature (EP) infants who are <28 weeks gestational age (GA) or <1000 grams of birth weight (BW). The study results will be analyzed as intention to treat Bayesian analyses (Frequentist analyses will also be performed).

Vitamin D deficiency is recognized as a cardiovascular risk factor. Diabetic patients are of major risk for cardiovascular diseases and typically present with Vitamin D deficiencies. Myocardial function is altered in both type I and II diabetic patients but no data is today available on the effect of Vitamin D supplementation. The aim of the study will be to investigate myocardial function (by deformation imaging techniques) at rest and during low-dose dobutamine stress echocardiography in both type I and II diabetic patients. Within each diabetic population, myocardial function will be compared at baseline between the vitamin D deficient and non-deficient individuals. Furthermore, the investigators will study the effect of a 3 month supplementation in those with deficiencies.

Cystic fibrosis (CF) is an autosomal recessive disease caused by alterations in the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) gene, characterized by multisystemic alterations, mainly in the lung, intestine, sweat, and bile ducts. In addition to pulmonary involvement, the presence of exocrine pancreatic insufficiency also increases the risk of survival, as it is associated with malnutrition and deficiency of fat-soluble vitamins, such as vitamin D. Vitamin D, in addition to its role in bone health, in the case of CF patients with chronic inflammation, it has been suggested that many of the cytokines that regulate the inflammatory response contain elements that respond to vitamin D, so vitamin D could play an essential role in the regulation of the inflammatory response in CF, which could favor lung function. However, more than 50% of CF patients present vitamin D insufficiency or deficiency, despite the different schemes suggested for supplementation in different age groups, which suggests that new strategies are needed to normalize vitamin D levels, which will allow us to see its clinical effect on the inflammatory response, by decreasing the number of exacerbations and thus perpetuating or improving lung function, as well as on bone mineral health.

The current study is designed as a prospective partially randomized patient preference (PRPP) trial and recruit psychiatric outpatients or inpatients. Participants who agree to receive randomization will be randomly assigned into a supplementation or placebo group, after stratification for pre-intervention vitamin D status (12-20 ng/mL or <12 ng/mL) and depression status (HDRS-17 ≥ 17 or < 17). Participants who decline randomization but agree to receive follow-up in the observational cohort choose their preferred method (either 4800 IU vitamin D3 per day, or usual care without supplementation). Severity of depression, any change of medication, and side effect will be assessed at baseline and at 2-week intervals for 8 weeks. Serum levels of 25(OH)D, C-Reactive protein (CRP) and 12 cytokines, anthropometrical measurements, dietary intake, physical activity and sun exposure will be assessed at baseline and post-intervention. Additionally, serum levels of 25(OH)D will be assessed at 4 weeks to ensure its safety level.

Background: About 1.5 million U.S. women of reproductive age are estimated to be infertile. Many more have difficulty getting pregnant. Menstrual cycles are an indicator of a woman s general health. Menstrual cycle changes may predict difficulties in getting pregnant. Researchers want to see what role vitamin D may play in menstrual cycle health. Objective: To examine the effect of vitamin D supplementation on the hormones that come from the brain and the ovary during a menstrual cycle. Eligibility: Women aged 19-40 who have spontaneous menstrual cycles (are not taking any hormones) less than 50 days in length. Design: Participants will fill out a screening survey about their demographics and health history. It will take 5-10 minutes to complete. Participants will have 3 study visits. Participants who are deficient will be randomized to receive either a lower or higher dose of vitamin D supplements. Participants who are sufficient will receive placebo. If they are vitamin D deficient, they will not get the placebo. They will take the capsules by mouth, once per week, for 3 menstrual cycles (or about 90 days). Participants will have physical exams. Their height, weight, body fat percentage, blood pressure, and waist-hip ratio will be measured. They will give blood samples. They will have vaginal and oral swabs. Participants will keep a daily menstrual diary. They will do daily home ovulation testing. They will collect urine at home. Some women may collect menstrual blood at home. Participants will fill out an online survey. It will ask about their health, diet, and physical activity; birth control use; pregnancy history; menstrual cycle; smoking and drinking habits; education; and occupation. It will take 20-30 minutes to complete. Participation will last for four menstrual cycles (about 4 months).

The main objective of this placebo-controlled randomized double-blinded study is to investigate the effect of vitamin D supplementation on vitamin D status (25(OH)D concentration in the blood) among individuals with a chronic spinal cord injury (SCI). Further, the effects of vitamin D supplementation on several other parameters (e.g. bone density and mood) are investigated, which could reveal positive secondary effects of supplementation that are especially relevant for clinical practice.

Vitamin D deficiency accelerates vascular risk progression after kidney transplant.

This study is a randomized controlled trial which compares the effect of vitamin D3 therapy 5,000 IU daily and 50,000 IU on 25(OH)D and 1,25(OH)2D, VDBP, and 24,25(OH)2D maternal serum levels in pregnant women with vitamin D deficient and insufficient.

This randomized pilot early phase I trial studies how well cholecalciferol works in treating patients with newly diagnosed non-Hodgkin lymphoma or chronic lymphocytic leukemia with low levels of vitamin D (vitamin D deficiency). Cholecalciferol may increase levels of vitamin D and improve survival in patients with non-Hodgkin lymphoma or chronic lymphocytic leukemia receiving standard of care chemotherapy.

A comparison between resistive exercise and high intensity interval trainig on calcium and vitamin d in premenopausal women.