Clinical trials: Vitamin D and Calcium Homeostasis
Magnesium Deficiency, Calcium Metabolism Disorders
How Does Magnesium Status Influence Calcium Homeostasis?
The investigators aim to recruit 60 women who have agreed to participate in an existing randomized, double-blind, placebo-controlled trial (Treatment of Vitamin D Insufficiency, HSC 2009-0055).
- Trial name
- NCT01593501
- Testing
- vitamin D3
- Where
- United States
- Volunteers
- 39 people, healthy volunteers welcome
- Sponsor
- University of Wisconsin, Madison
Osteoporosis
The Interaction Between Calcium and Vitamin D Intake
We will study the relative importance of high calcium intake and vitamin D supplementation for calcium homeostasis, as determined by serum parathyroid hormone (PTH) and biochemical bone markers.
- Trial name
- PTH Modified (NCT00762775)
- Testing
- Calcium and vitamin D supplementation
- Where
- United States
- Volunteers
- 78 people, healthy volunteers welcome
- Sponsor
- Winthrop University Hospital
Vitamin D, Vitamin D and Calcium Homeostasis
Free Vitamin D and Steroid Metabolism in Endocrine Disorders
This clinical study aims to gain a better understanding of how different forms of vitamin D are processed in the body in healthy individuals, pregnant women, and patients with various hormonal (endocrine) and kidney (renal)…
- Trial name
- FREEDOM (NCT07268742)
- Testing
- Blood draw for the laboratory assessment
- Where
- Belgium
- Volunteers
- 930 people, healthy volunteers welcome
- Sponsor
- Universitaire Ziekenhuizen KU Leuven
Glucose Intolerance, Type 2 Diabetes Mellitus
Vitamin D and Calcium Homeostasis for Prevention of Type 2 Diabetes
The purpose of the randomized trial is to quantify the effect of vitamin D and calcium supplementation on beta-cell function, insulin sensitivity, glucose tolerance and systemic inflammation and other cardiometabolic outcomes in…
- Conditions
- Glucose Intolerance, Type 2 Diabetes Mellitus, Metabolic Syndrome
- Trial name
- CaDDM (NCT00436475)
- Testing
- Vitamin D3 2,000 IU orally once daily, Calcium Carbonate 400 mg orally twice daily
- Where
- United States
- Volunteers
- 92 people, healthy volunteers welcome
- Sponsor
- Tufts Medical Center
Osteoporosis Secondary, Breast Cancer Females
Vitamin k, D-chiro Inositol and α-lactalbumin in Bone Homeostasis
In women with breast cancer undergoing adjuvant hormone therapy, the marked tissue hypoestrogenism induced by therapy with aromatase inhibitors and/or tamoxifen ± GnRH analogues causes a significant acceleration in bone mass…
- Trial name
- Synostea (NCT07256769)
- Testing
- Group 1: calcium carbonate/cholecalciferol, Group 2: Synostea® (calcium carbonate/cholecalciferol/vitamin K/α-lactalbumin/ d-chiro-inositol)
- Where
- 2 sites in Italy
- Volunteers
- 134 people
- Sponsor
- Regina Elena Cancer Institute
Vitamin D and Calcium Homeostasis
CYP3A4 Activity and Mineral Homeostasis
The purpose of this study is to determine whether changes in the activity of the enzyme CYP3A4 can change the Vitamin D and bone mineral homeostasis.
- Trial name
- NCT02019875
- Testing
- Rifampin, Clarithromycin, Grapefruit Juice
- Where
- United States
- Volunteers
- 92 people, healthy volunteers welcome
- Sponsor
- University of Washington
Vitamin D Deficiency
Effects of Vitamin D Dose and Genotype of the Binding Protein in Infants and Children
The purpose of this study is to determine if the vitamin D binding protein genotype influences circulating vitamin D levels and if it may have functional consequences on vitamin D activity.
- Trial name
- VitaD (NCT01050387)
- Testing
- Vitamin D
- Where
- United States
- Volunteers
- 193 people, healthy volunteers welcome
- Sponsor
- Yale University