32 Clinical Trials for Various Conditions
An Open-Label, Repeated-Dose Safety, Efficacy, Pharmacokinetic and Pharmacodynamic Study of Oral CTAP101 Capsules, Immediate- Release (IR) Calcifediol, High-Dose Cholecalciferol, and Paricalcitol Plus Low-Dose Cholecalciferol in Patients with Secondary Hyperparathyroidism, Stage 3 or 4 Chronic Kidney Disease and Vitamin D Insufficiency
Our primary aim is to evaluate whether Vitamin D deficiency causes depressive symptoms in antepartum and postpartum depression and whether early correction of Vitamin D deficiency improves these symptoms. Our secondary aims evaluate maternal and fetal outcomes including antepartum, intrapartum, and immediate postpartum complications. We are also evaluating the effectiveness of a common vitamin D treatment regimen used outside of pregnancy.
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 partially randomized clinical trial studies cholecalciferol in improving survival in patients with newly diagnosed cancer with vitamin D insufficiency. Vitamin D replacement may improve tumor response and survival and delay time to treatment in patients with cancer who are vitamin D insufficient.
This study will evaluate the efficacy of CTAP101 Capsules versus placebo in reducing intact parathyroid hormone (iPTH) by at least 30% from pretreatment baseline; safety and tolerability of CTAP101 will also be evaluated
This study will evaluate the efficacy of CTAP101 Capsules versus placebo in reducing intact parathyroid hormone (iPTH) by at least 30% from pretreatment baseline; safety and tolerability of CTAP101 will also be evaluated
The purpose of this study is to answer the following questions: Does vitamin D increase calcium absorption, bone mass and muscle mass and function in women past menopause who have mildly low vitamin D levels? Do these benefits require prescription-strength vitamin D, or is an over the counter vitamin D dose enough?
The study objective is to characterize the threshold levels of serum 25-hydroxyvitamin D for the definition of vitamin D insufficiency in 8-14 year old African American and Caucasian children. We propose a 6 month randomized placebo controlled trial of vitamin D (vitamin D3 1000 IU/day vs. placebo) initiated during October through March (during fall and winter) in 8 to 14 year old African American and Caucasian children. The results of the trial will help establish the cutoff threshold value of serum 25(OH)D for defining vitamin D insufficiency in preadolescent and adolescent children. Safety of vitamin D supplementation will be assessed by measuring serum calcium at 0, 2 and 6 months and by monitoring for adverse events. Currently recommended adequate intake for vitamin D of 200 IU daily may not meet the body's daily needs for vitamin D. Therefore, it is likely that a higher level of daily vitamin D intake may be needed to meet the body's skeletal and non-skeletal demands for vitamin D. Determining the dietary required intake of vitamin D for the prevention of vitamin D insufficiency during childhood has immense public health potential for addressing health disparities and ensuring better bone health during adulthood. The primary outcome measure will be serum 25(OH)D and parathyroid hormone (PTH). The secondary outcome measures will include: markers of bone formation (serum P1NP) and bone resorption (serum CTX).We will also examine differences in serum 25(OH)D, PTH, and markers of bone turnover in African American vs. Caucasian children.
Pharmacokinetics and Safety Study of CTAP101 Capsules in Japanese and non-Japanese Healthy Subjects
There continues to be debate as to how much vitamin D an adult requires to be vitamin D sufficient. A multitude of association studies have suggested that improving serum 25(OH)D \>30 ng/mL may reduce risk of many chronic illnesses and improve immune function. The aim of this study is to define dynamic changes in PTH, broad gene expression in circulating immune cells, metabolomics, and microbiome profile in response to varying doses of vitamin D supplementation.
The purpose of the research is to describe vitamin D levels and bone status in a rural Wisconsin population. It is probable that individuals of varying age and ethnicity require different amounts of D to achieve optimal status. These likely scenarios will be explored in various populations. We hypothesize that the increase in serum 25(OH)D resulting from daily D3 ingestion is less pronounced with advancing age and different in Native than Caucasian Americans. In addition, the women in the middle age group, between the ages of 55 and 65, will have ultrasound tests completed to assess the impact of the Vitamin D supplementation on cardiovascular health.
Vitamin D is important to maintain good health. Although it is found in foods and vitamins, many people still have low vitamin D levels. One purpose of this study is to describe vitamin D levels from patients at the University of Colorado Seniors Clinic. Another goal of the study is to find out if education by a pharmacist can increase vitamin D levels in patients who have low vitamin D levels.
This is a feasibility interventional study seeking to determine the safety and efficacy of the Solius Photobiologic System in increasing the serum levels of 25(OH)D in a vitamin D deficient/insufficient adult population.
The aim of this study is to evaluate the safety and effectiveness of the SOLIUS System in improving serum levels of 25-hydroxyvitamin D in vitamin D deficient/ insufficient adults of various skin types. The investigators will conduct a double-blinded randomized clinical trial in 100 adults to compare the changes in serum 25-hydroxyvitamin D levels between subjects who received and do not receive weekly exposures to Ultraviolet B Radiation (UVB) generated by the SOLIUS System for 16 weeks.
This study evaluates the relationship between vitamin-D status and severity of sarcoidosis, and the effects of vitamin-D repletion in vitamin-D insufficient patients with sarcoidosis. Half the patients with sarcoidosis who are vitamin-D insufficient will receive standard vitamin-D supplementation via standard regimen while the other half will receive a placebo. Sarcoidosis patients who are vitamin-D sufficient will also act as controls.
VISTA is looking to see if vitamin D supplements before bariatric surgery might improve vitamin D stores, which may help to prevent some complications like infections. Who can join this research study? * Approved to undergo bariatric surgery-Roux-en-Y Gastric Bypass or Vertical Sleeve Gastrectomy-at the Johns Hopkins Bayview Medical Center * 18 to 64 years of age * BMI of 35 to 49.9 kg/m2 * VitD insufficient or deficient prior to having surgery What will happen if a participant chooses to participate in this research study? * The participant will be randomly assigned (by chance) to receive either: * Standard care plus vitamin D supplements or * Standard care plus a placebo (contains no vitamin D) * Either would be provided at no cost to the participant * The investigators will ask the participant to complete a survey on the day of surgery regarding supplement use * The investigators will follow the participants medical record through the 12 month follow up clinic visit.
The discovery that the vitamin D receptor is expressed in more than 30 tissues indicates that the physiologic functions of vitamin D are much broader than its well-known role in the regulation of calcium absorption and bone metabolism. There is evidence that vitamin D is involved in the pathogenesis of cancer, cardiovascular disease, multiple sclerosis, and type I diabetes. Recent epidemiological evidence points to a strong association between vitamin D insufficiency and insulin resistance, the metabolic syndrome, and type II diabetes. The investigators would like to examine the role of vitamin D in the development of insulin resistance in overweight children and adolescents, which represent a high risk population for cardiovascular and metabolic complications. The investigators propose a prospective randomized clinical trial of vitamin D supplementation in overweight, insulin resistant, vitamin D deficient children. The investigators objective is to assess if changes in insulin resistance, fasting lipid profiles, blood pressure, and inflammatory markers occur in these patients post treatment with vitamin D. Additionally, concomitant changes in calcium and bone metabolism after vitamin D treatment will be evaluated. This is because, contrary to adults, the optimal vitamin D concentrations that regulate calcium and bone metabolism have not been established in pediatrics.
This study will supplement African American male (AAM) veterans at risk for diabetes and newly diagnosed T2DM with vitamin D (low or higher dose) and evaluate whether vitamin D helps to improve early markers of diabetes. The study will be done at Veteran Administration Medical Center in Chicago.
This study will investigate how the levels of a repeat dose of CTAP101 changes in the body over time (pharmacokinetics, PK) and how CTAP101 affects other mineral and hormonal balances (pharmacodynamics, PD) in patients with chronic kidney disease (CKD, vitamin D insufficiency and secondary hyperparathyroidism (SHPT).
A growing body of evidence suggests that vitamin D status is important in biologic processes involved in the maintenance of physical function. To advance the investigators understanding of the role of vitamin D in physical function, the investigators will conduct a feasibility pilot study to collect key information to help design a full-scale randomized trial to determine whether vitamin D supplementation will delay declines in physical function. The primary goals of the pilot study are to determine cost-effective strategies for identifying persons at high risk for functional decline with insufficient vitamin D levels, determine the serum vitamin D response to a vitamin D supplementation regimen designed to attain sufficient vitamin D levels, and provide preliminary data of key functional measures (balance, physical performance and muscle power) for the future larger study design. A secondary goal is to begin to examine potential mechanisms by which vitamin D supplementation may enhance physical performance by exploring the effects of vitamin D supplementation on changes in skeletal muscle gene expression.
It is the investigators hypothesis that the current method of evaluating vitamin D status, measuring circulating 25-hydroxy vitamin D is not providing the full metabolic picture, and is therefore inadequate. The investigators liken this concept to the evolution of cholesterol where initially, total cholesterol was the only measurement, and have since determined the importance of HDL, LDL and triglycerides in evaluating patient status. Similarly, the investigators feel measurement of other vitamin D components such as sulfated vitamin D, circulating vitamin D3 and 3-epi 25-hydroxy vitamin D will offer more comprehensive information about a patient's vitamin D status. It is our overarching hypothesis that a "vitamin D assay panel," will enhance understanding of vitamin D status. It is our expectation that the enhanced understanding based on improved measurement capability will ultimately translate to improved definition of vitamin D status and need for supplementation on an individual level.
Vitamin D plays a critical role in maintaining bone health, as well as preventing cardiovascular disease, cancer, and various autoimmune diseases, such as diabetes. Vitamin D deficiency is very common in the United States and worldwide, and is now being increasingly recognized and treated. One group in which vitamin D deficiency may be particularly important is patients who have had kidney stones. These patients frequently have elevated levels of calcium in their urine, which is a common and important risk factor for calcium containing kidney stones. Because vitamin D increases absorption of calcium into the blood by the intestines, physicians may be reluctant to prescribe vitamin D therapy to patients with vitamin D deficiency if they also have kidney stones and high amounts of calcium in the urine. They are concerned about the possible risk of increasing the amount of calcium in the urine (and thereby increasing the risk of calcium stones occurring again). However, studies in patients without kidney stones, as well as studies in patients with high calcium levels in the urine, have demonstrated that giving vitamin D is effective and safe and does not increase calcium in the urine. Therefore, the investigators will study the effects of giving vitamin D on the amount of calcium in the urine in patients with a history of kidney stones and elevated calcium in the urine. The investigators will evaluate the safety of giving vitamin D to this particular group of patients.
The investigators are conducting a prospective cross-over study to evaluate the effects of vitamin D supplementation on diabetes control and the pro-inflammatory markers involved in microvascular complications in adolescents with Type 1 Diabetes. The investigators expect to see a significant improvement in glycemic control and a reduction of serum pro-inflammatory markers in adolescents with Type 1 Diabetes and vitamin D deficiency or insufficiency, who are treated with vitamin D.
The overall goal is to enhance vitamin D status in a safe and effective manner. A 3-week randomized comparator-controlled trial among a cohort of adults with CKD (stages 3-5) (n=24) will test the main objective: Evaluate the bioefficacy of D3 in micro- and nanoparticles (4000IUs) in almond milk with the sub-objective of: Explore the effect of D3 in micro- and nanoparticles (4000IUs) in almond milk on inflammation markers CRP, TNF-α and IL-6.
Patients with end-stage renal disease on dialysis (ESRD5D) are 4-5x more likely to suffer from a fracture. Fractures can occur spontaneously but typically occur after a fall. Further, 70-90% of patients with ESRD5D are vitamin D deficient. Vitamin D supplementation has become routine care for many in this patient population, but evidence is lacking to support this practice. The proposed projects objective is to gather needed preliminary data regarding the effects of vitamin D supplementation on balance and muscle strength in patients with ESRD5D.
Although vitamin D is known to play a major role in multiple organ functions in healthy adults, including bone homeostasis, its role in the unique population of orthopaedic polytrauma patients has not been well described. The aim of this therapeutic randomized placebo-controlled feasibility study is to determine the effect of vitamin D supplementation initiated on admission on patients' 25(OH)-D level, bone turnover markers, and clinical outcomes in a cohort of adult orthopaedic polytrauma patients. Polytrauma patients with one or more orthopaedic injuries admitted to an urban Level I trauma center will be screened for eligibility based upon strict inclusion and exclusion criteria. Sixty patients meeting the criteria will be consented, enrolled and randomized in a 1:1 ratio to intervention and control (placebo) arm. Baseline 25(OH)-D and bone turnover marker levels will be drawn for all the patients on admission, and the intervention arm will receive a one-time dose of ergocalciferol (Vitamin D2) 400,000 IU shortly after enrollment. The labs will be repeated 7 days after the initial draw or at discharge, whichever occurs first. Patients' daily immobilization status, baseline characteristics and clinical outcomes will be recorded. Statistical methods will be used to assess whether there is a difference in 25(OH)-D and bone turnover markers levels associated with the intervention.
In the past two decades, the role of vitamin D has extended beyond bone health to encompass a wide range of biological activities important to physical function in older adults. A growing body of evidence now shows that circulating 25-hydroxyvitamin D (25(OH)D) levels \< 75 nmol/L (\< 30 ng/mL)) are associated with physical impairments such as reduced walking speed and impaired balance as well as falls. Older adults are at risk for low levels of 25-hydroxyvitamin D because of reduced exposure to ultraviolet B radiation, reduced efficiency of previtamin D synthesis in the skin, and low dietary intake. Although data from the National Health and Nutrition Examination Survey (NHANES) 2000-2004 indicate that frank vitamin D deficiency (serum 25(OH)D \< 25 nmol/L \[10 ng/mL\]) is rare in the U.S. (5% or less), vitamin D insufficiency (serum 25(OH)D \< 75 nmol/L \[30 ng/mL\]) is prevalent (\~75%) among older adults. Older home-bound adults are a vulnerable subgroup of older adults for poor dietary intake and nutritional health, nutrition-related health conditions, and functional decline and disability. The primary goal of this pilot study is to assess the feasibility of a partnership with Senior Services of Forsyth County to address vitamin D insufficiency in home-bound older adults receiving home-delivered meals. A secondary goal is to obtain preliminary data on the effectiveness of vitamin D supplementation on improving vitamin D levels and reducing falls.
A randomized clinical trial to determine if vitamin D repletion in CKD (Chronic Kidney Disease) patients with low vitamin D levels will decrease proteinuria, a marker of kidney damage.
This study will investigate how the levels of a single dose of CTAP101 changes in the body over time (pharmacokinetics, PK) and how CTAP101 affects other mineral and hormonal balances (pharmacodynamics, PD) in patients with Stage 3 or 4 chronic kidney disease (CKD) with vitamin D insufficiency and secondary hyperparathyroidism (SHPT).
This study will compare CTAP201 with Doxercalciferol in patients with chronic kidney disease (CKD) and secondary hyperparathyroidism (SHPT), undergoing regular hemodialysis, at different dose strengths. This study will also investigate the levels of CTAP201 in the body over time and determine the safety of CTAP201.