Active clinical trials for "Vitamin D Deficiency"

This pilot study will investigate the effect of Vitamin D supplementation in improving glucose control with patients with poorly controlled diabetes and concurrent Vitamin D deficiency.

The purpose of this study is to determine if a single dose of vitamin D administered orally in the fall will provide adequate vitamin D in healthy individuals for the duration of the winter, during which vitamin D levels are known to decrease. The investigators are also interested in finding out if this level of vitamin D will provide adequate levels for the remainder of the year. While the benefits of once-yearly vitamin D administration are clear for patients with osteoporosis, osteomalacia, rickets, and other conditions associated with vitamin D deficiency and high bone turn-over, studies have not been performed in which high doses of vitamin D were used to prevent the seasonal decline of vitamin D concentrations in healthy individuals. These findings could provide evidence to support vitamin D administration to healthy individuals in the wintertime to improve health outcomes, and provide the basis for additional studies in both healthy and sick populations.

Sepsis in a clinical entity that occurs in patients with serious infections. Though the severity of illness may vary, every year, approximately 1.6 million Americans are treated for sepsis. Even with timely interventions, anywhere from 16% to >80% of patients with sepsis will not survive. Immune dysfunction is thought to play a critical role in the ability for infections to evolve into sepsis and to eventually lead to death. Recently, vitamin D has been identified as a key regulator of the immune system. While it remains unclear whether optimizing vitamin D status may improve outcomes in sepsis, little is known about the effects of vitamin D supplementation in patients with severe infections. As such, our goal is to study whether high doses of cholecalciferol (vitamin D3) can improve vitamin D status and boost certain aspects of the immune system in patients with sepsis.

The purpose of this study is to compare the preference of Calcichew D3 500/400 (containing 500 mg calcium and 400 IU of vitamin D) with Adcal-D3 600/400 (containing 600 mg of calcium and 400 IU of vitamin D) in Test Group 1, and to compare Calcichew D3 500/800 (containing 500 mg calcium and 800 IU vitamin D) with Kalcipos-D 500/800 (containing 500 mg of calcium and 800 IU of vitamin D) in Test Group 2.

Documented roles for vitamin D in calcium homeostasis, cardiovascular and respiratory health, inflammation, innate immunity, and neuromuscular function have led to the hypothesis that deficiency might represent a modifiable risk factor for outcomes in critical illness. In recent years, dozens of adult studies have reported both high deficiency rates, and associations between lower vitamin D levels and organ dysfunction, health resource utilization, and mortality in the intensive care unit (ICU). More recently, similar observations have been made in critically ill pediatric populations. The cumulative body of basic science and clinical literature demonstrates that deficiency is common in critical illness and rapid normalization of vitamin D status could improve clinical outcomes and/or reduce health care costs. However, before conducting a phase III trial to determine whether restoration of vitamin D status improves outcomes in the PICU, the appropriate dosing regimen must be identified. Consequently, the investigators propose a phase II, double blind randomized controlled trial to determine a loading therapy dosing regimen that can safely and rapidly normalize vitamin D status in critically ill children.

Vitamin D deficiency is common in older persons, in particular in residents of nursing homes. This is mainly explained by the fact that older persons do not often go outside in the sunshine. On top of that the capacity of the skin to synthesize provitamin D is decreased and dietary vitamin D intake is low. Vitamin D deficiency leads to osteoporosis, falls and fractures. To prevent morbidity and mortality due to falls and fractures it seems logical to supplement vit D in order to correct the deficiency. The advised daily dose of vit D supplementation is 800 IU. Several studies showed that with this dose the required serum 25(OH)D levels will not be reached. primary objective of this study is: to investigate whether with a loading dose based on body weight and baseline serum 25(OH)D level more patients reach adequate serum 25(OH)D levels compared to 800 IU a day. to determine the best consolidation treatment. Secondary objective is a loading dose based on body weight and baseline serum 25(OH)D level safe to use in residents of nursing homes. is there a relation between the increase in serum 25(OH)D level and muscle strength (handgrip strength). is there a relation between the increase in serum 25(OH)D level and mobility (2 minute walk test). Study design: Randomised trial with 3 study groups: Group 1a. loading dose based on body weight and baseline serum 25(OH)D level + 50.000 IU vit D3/month consolidation therapy. Group 1b. loading dose based on body weight and baseline serum 25(OH)D level + 25.000 IU vit D3/month consolidation therapy. Group 2. 800 IU vit D3/ dag. Study population: Vitamine D deficient residents of nursing homes, 65 years or older.

The purpose of this study is to investigate the effect of vitamin D repletion on disease activity and disability in patients with rheumatoid arthritis. The investigators hypothesize that rheumatoid arthritis (RA) patients with vitamin D deficiency have greater disease activity and disability, compared to RA patients with normal vitamin D levels. The investigators also hypothesize that vitamin D treatment in these deficient patients will result in a decrease in RA disease activity and disability.

The purpose of the study is determination of effective vitamin D replacement strategy in vitamin D deficiency states with currently available preparations in Pakistan & to determine the cost effective monitoring strategy with urinary calcium excretion serving as a surrogate marker of achievement of vitamin D sufficiency state. The study will be conducted at the out-patient Endocrinology Clinics of the Aga Khan University Hospital, Karachi, Pakistan. All patients seen in endocrine clinics with Vitamin D level less than 20 ng and do not have any of exclusion criteria mentioned below will be eligible for recruitment in the study. The study participants will be randomly assigned into 4 groups for intervention to receive intramuscular or oral Vitamin D in 200,000 or 600,000 units as per group allocation. Each group will comprise of 25 participants. Group 1: Vitamin D3 600,000 units IM and then every 2 monthly for 2 times if levels remain < 30 ng/ml. Group 2: Vitamin D3 600,000 units orally and then every 2 monthly for 2 times if levels remain < 30 ng/ml. Group 3: Vitamin D3 200,000 units IM initially and then every 2 monthly for 2 months if levels remain < 30 ng/ml. Group 4: Vitamin D3 200,000 units orally initially and then every 2 monthly for 2 times if levels remain < 30 ng/ml. All patients will be prescribed elemental Calcium 1 gram /day. Vitamin D levels along with the other biochemical parameter and random urine for calcium & creatinine will be checked at 00, 02, 04, 06 and 12 months.

This study will examine whether the amount and type of fat, mono-unsaturated fat (MUFA) vs. poly-unsaturated fat (PUFA), in a meal affects the absorption of vitamin D, which is taken after that meal. The study hypothesis is that vitamin D3 absorption will be greater when fat is present vs. absent in the meal. A secondary hypothesis is that vitamin D3 absorption will be greater in the presence of a meal with a high MUFA/PUFA compared with a low MUFA/PUFA ratio.

The purpose of this research study is to determine whether taking vitamin D, every day, over a 12 week period will improve the vitamin D status, risks for poor heart health, risks for developing type 2 diabetes, and/or muscle strength in overweight, African American teenagers with low vitamin D levels.