Active clinical trials for "Vitamin D Deficiency"

This is a cross-sectional study designed to compare plasma/serum and urine vitamin D metabolite profiles of vitamin D sufficient and insufficient individuals. There are two phases of this study. Phase 1 - Consented study participants will attend a screening visit and provide a fasting blood and urine sample. Those individuals who are vitamin D insufficient based on serum 25(OH)D concentrations will be invited to participate in Phase II Phase II - is a double-blind, randomized, control study designed to examine vitamin D status in vitamin D insufficient individuals consuming a water-soluble form of vitamin D3. Eligible participants will be asked to consume one of three beverages: i) rooibos iced-tea (control); ii) rooibos iced-tea fortified with 1000 IU of water-soluble vitamin D3; or iii) rooibos iced-tea fortified with 1000 IU of water-soluble vitamin D3 and 360 mg calcium at 240 mL of iced-tea consumed daily for 6 weeks. Participants will attend 6 weekly visits following baseline and provide a fasting blood sample for assessment of serum 25(OH)D concentrations. Objectives: 1) To investigate plasma/serum and urine vitamin D metabolite profiles in vitamin D sufficient and insufficient individuals; and 2) To determine the effects of vitamin D3 fortification on serum 25-dihydroxy-vitamin D [25(OH)D] concentrations, markers of vitamin D and calcium metabolism, and vitamin D metabolite profile in plasma/serum and urine of vitamin D insufficient individuals.

Iron is one of the most vital elements in humans as it plays a role in physiological functions such as transferring and storing oxygen, transporting electrons and catalysing numerous reactions, from oxidative metabolism to cellular proliferation. Iron deficiency can be attributed to poor absorption that leads to insufficient iron to meet body requirements. Oral iron supplements have been extensively used to treat iron deficiency and iron deficiency anaemia. However, the use of iron compounds in fortifying foods is one of the best practical approach to combat iron deficiency, while improving diet and food pattern involves long-term goal which can be challenging. Vitamin D has recently been shown to affect hepcidin levels, which in turn has effects on iron status but there are a limited number of studies investigating the hepcidin profile in humans following iron supplementation, and few data are available, especially in humans, despite its role as a primary iron absorption and homeostasis regulator. Although several studies have been carried out using iron fortified products, there is limited data on the potential effect of vitamin D on iron metabolism amongst iron deficient women in particular. Therefore, the present study aims to investigate the effect of vitamin D3 supplementation (1500 IU) consumed with iron fortified breakfast cereals on haematological indicators and hepcidin response in iron deficient women.

Platelets play pivotal role in atherosclerosis and acute cardiovascular events. Platelet hyperreactivity and increase platelet-monocyte aggregate (PMA) formation are found in HIV infected patients, which may contribute to the excess cardiovascular risk. Low level of vitamin D has been associated with the presence of cardiovascular diseases. The aim of our study is to determine the effect of vitamin D supplementation on platelet activation, platelet reactivity and platelet-leukocyte complex formation in asymptomatic HIV-infected patients treated with ART

The purpose of the study is to evaluate the effect of daily oral supplementation with vitamin D on serum Vitamin D levels in term healthy newborns. It has been found in various studies that vitamin D is highly deficient in Indian mother infant diads. There is a need to supplement vitamin D from neonatal period to prevent various metabolic disturbances due to vitamin D deficiency in later life. This study aims to find the effectiveness and the optimum dose of routine vitamin D supplementation in healthy term newborns for fulfilling the normal requirements in Indian infants.

Prevalence of vitamin D deficiency in children in the northern country during winter season is very high (up to 90%). Vitamin D supplementation at a dose 600 -1000 IU/d is recommended in Polish children from September till April. However, there is shortage of studies in Polish children. The aim of the study is to assess the effectiveness of vitamin D supplementation in the prevention of vitamin D deficiency in Polish children (4-10 years of age).

This study is a randomised control trial (RCT) pilot study to determine the appropriate vitamin D dose for the main study. The pilot study includes three matched groups, which will form two vitamin D supplementation groups (at 25,000 IU and 50,000 IU every two months), and a third placebo supplementation group. The aim was to develop an appropriate supplementation regimen that was compatible with recruit training and maintained serum vitamin D (25OHD) status above 50 nmol/l during recruit training.

Prospective randomized study of 150 patients qualified for knee arthroplasty between 2015 and 2017. Patients were randomized into 3 groups receiving vitamin D and calcium supplementation, increased protein supply and preoperative rehabilitation, respectively. Following factors were analyzed: changes in vitamin D3, calcium, total protein, albumin and CRP levels during preparation for surgery, nutritional status on the Subjective Global Assessment (SGA) scale, osteoporosis risk assessment according to the Osteoporosis Risk SCORE, level of pain felt on the scale VAS and the number of analgesics used, the result of the Duke Activity Status Index, the result of the following scales: Cardiac Risk Index for Orthopedic Surgery (Lee), Knee injury and Osteoarthritis Outcome Score (KOOS), Fear Avoidance Beliefs Questionnaire (FABQ) about Physical Activity, The Quality of Life Scale (QOLS). Additionally, the occurrence of perioperative complications was analyzed (e.g. venous thrombosis and pulmonary embolism, wound or joint infection, excessive bleeding, loosening of the implant, bone fracture or fracture, pain).

Background Vitamin D (VD) is essential for calcium absorption, bone health and growth in children. In a national representative sample authors found mean serum concentration of 25-Hydroxi-Vitamin-D (25-OH-D) of 59 nmol/L, in children < 5 y of age. Prevalence deficiency of VD under 50 nmol/L was 33%, which means that 3 million preschool- age children have VD deficiency in Mexico. Additionally, less than 3% of the children use supplements with VD. Objective To assess the effect of 400UI, 800IU of vitamin D2 and 1000IU of vitamin D3-colecalciferol- over 25-Hidroxi Vitamin D (25-OH-D) status and a multiple vitamin supplementation per day as a control group in children from 12-30 months of age in Cuernavaca, Morelos in a 4 month period. Methods Randomized double blind parallel clinical trial, with vitamin D3 (colecalciferol) supplementation in 220 children from 12 - 30 months who attend day care centers. Three supplementations will be given to children: 400IU and 800IU of vitamin D2, the third group 1000IU of D3-colecalciferol- and the control group will receive a multi vitamin supplementation. The duration of the intervention will be 16 weeks. Blood measurements would be taken at baseline, and at 16 weeks. This study compares the efficacy of three dose of VD in children from 12-30 months of age, over the nutritional status of 25 hydroxivitamin D (25-OH-D). This intervention is of importance to establish supplementation strategies to prevent VD deficiency in Mexico. Keywords: Vitamin D, nutritional deficiencies, micronutrients, children, México.

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 deficiency is common world wide. 25 OH vitamin D level is the best indicator of vitamin D status. The determination of the appropriate dose of vitamin D supplement is essential for management of vitamin D deficiency as well as for designing vitamin D fortification programs. The increments in 25 OH vitamin D levels following various doses of vitamin D supplement for different genders, body weights, and starting 25 OH vitamin D level have not been well defined. The time course of depletion of repleted vitamin D stores is also not known. The investigators plan to conduct a double blind randomized study on 9 cohorts to determine levels of 25 OH vitamin D following supplementation with different doses of vitamin D3 for 5 months and their withdrawal for 3 months.