Active clinical trials for "Vitamin D Deficiency"

Supplementation with vitamin D improves HIV+ macrophages phagocytosis in vitro. There is evidence to suggest that administering vitamin D can in fact improve immune function in individuals. The study will evaluate the impact of high dose vitamin D in HIV+ smokers' and HIV- smokers' in vivo. The primary goal is to improve innate immune host response to infection in patients already at high risk by virtue of HIV and smoking status.

The purpose of this study is to determine if vitamin D supplementation changes the results of certain tests associated with inflammation in the body using an oral, synthetic form of vitamin D called paricalcitol.

The cardiovascular effects of vitamin D therapy (in humans) have been documented only in patients with known vitamin D deficiency or hyperparathyroidism (a surrogate marker of inadequate vitamin D activity). It is unknown whether the cardiovascular benefits of vitamin D therapy extend beyond these patients to the general hypertensive population. We propose to directly measure the effect of vitamin D therapy on plasma renin activity (PRA), plasma renin concentration (PRC), renin transcription (in mononuclear leukocytes), and blood pressure in hypertensive (but otherwise healthy) patients in a randomized, controlled, experimental trial. This will be the first study to assess vitamin D receptor (VDR) biological (PRA, PRC, renin mRNA, and polymorphisms) and hypertensive activity in patients without vitamin D deficiency. We hypothesize that vitamin D inhibition of renin transcription will produce significant reductions in PRA, PRC, renin transcription, inflammatory cytokines, SBP, and DBP, with potential variation by VDR genotype. Such a result may prove to be significant in the treatment of hypertension, as even modest blood pressure reductions (5 mmHg) are associated with a 14% reduction in mortality due to stroke, a 9% reduction in mortality due to CHD, and a 7% overall reduction in all-cause mortality.

Vitamin D insufficiency is an increasing trend in the United States. According to the NHANES data collection there was a near doubling of patients with vitamin D deficiency in 10 years. Vitamin D deficiency is associated with several adverse outcomes such as increased fractures, certain microbial diseases, cardiovascular diseases, and metabolic dysfunction. The increasing prevalence of vitamin D deficiency has been attributed to the increasing prevalence of obesity. Several studies have shown that obese patients have lower 25-OH vitamin D (25-OHD) levels compared to nonobese patients and obese patients require more vitamin D compared to nonobese patients. The most commonly prescribed medication to replete vitamin D deficiency is oral ergocalciferol. To date, no prospective trials have been published to evaluate a standard protocol in the treatment of vitamin D insufficiency in adults.

This study will evaluate the effects of Vitamin D replacement and the effects of an approved medication for hypertension, aliskiren (Tekturna), in patients with high blood pressure who have low levels of vitamin D in their blood. The study will compare the effects of vitamin D or aliskiren alone and in combination on 24-hour blood pressure and biochemical parameters.

Vitamin D deficiency is common in obese patients. Most of vitamin D supplementation studies were done with non-obese subjects. This study looks at vitamin D supplementation requirements in obese patients as compared to non-obese subjects. This study also looks at changes in vitamin D level in obese patients undergoing medical weight loss. It is thought that obese patients have vitamin D deficiency through storage of vitamin D in the fat compartment not readily available for blood measurement. The investigators' hypothesis is that with medical weight loss vitamin D levels will increase in obese subjects.

The purpose of this study is to compare alfacalcidol and paricalcitol in the treatment of secondary hyperparathyroidism in hemodialysis patients.

To obtain up-to-date data on nutritional status of older adults, a national dietary survey will be conducted in 2022/2023, providing data on the consumption of foods and enabling the assessment intakes of energy and specific nutrients. Participating subjects will be also screened for micronutrient status using blood biomarkers (focusing into vitamin D, folic acid, vitamin B12, and iron).

The goal of this double-blind randomized controlled clinical trial is to determine the efficacy of the administration of magnesium chloride + vitamin D as an adjuvant in the treatment of post-Coronavirus Disease (COVID) syndrome. The participants will be integrated: a) Intervention group that will receive 1 g of magnesium chloride (equivalent to 300 mg of elemental magnesium) + 4000 IU of vitamin D once a day, for four months. b) Control group that will receive inert placebo for four months. The outcome variable will be the improvement of the post-COVID syndrome. At the beginning and end of the study, blood samples will be taken to determine serum levels of vitamin D, total magnesium, ionic magnesium, calcium, fasting glucose and lipid profile. The evaluation of the efficacy and safety of the proposed intervention will be carried out by establishing the differences between the intervention and control groups.

Vitamin D deficiency is now considered a global problem in general population, but it seemed to be more prominent in chronic kidney disease (CKD) patients, especially those on regular hemodialysis. Being a key regulator in mineral metabolism, there's also emerging evidences linking vitamin D deficiency with inflammation and oxidative stress, which are both recognized as constant threats to cardiovascular outcomes in hemodialysis patients. It's prospective, randomized trial that's carried out to evaluate the effect of weekly versus, monthly oral cholecalciferol, on vitamin D (25(OH)D) levels, oxidative stress markers, inflammatory markers and secondary hyperparathyroidism in hemodialysis patients. Fifty eligible hemodialysis patients were randomly assigned to either Group A (Oral 50.000IU Cholecalciferol, once weekly) or Group B (Oral 200.000IU Cholecalciferol, once monthly), for 3 months. Serum levels of (25(OH)D), serum malondialdehyde (MDA), serum superoxide dismutase (SOD), serum high sensitive (hsCRP), calcium, phosphorus, and intact parathormone (iPTH) levels, were all assessed at baseline and at the end of the study