Clinical trials: Vitamin C Deficiency
Mesopic Vision, Night Vision Loss
Safety and Efficacy of 0.75% Phentolamine Ophthalmic Solution in Subjects With Post-refractive Surgery Visual Disturbances
Safety and efficacy of 0.75% Phentolamine Ophthalmic Solution to improve mesopic low contrast visual acuity in subjects with post-refractive surgery visual disturbances.
- Trial name
- LYNX-2 (NCT06349759)
- Testing
- phentolamine ophthalmic solution 0.75%, a non-selective alpha-1 and alpha-2 adrenergic antagonist
- Where
- 25 sites in United States
- Volunteers
- 200 people
- Sponsor
- Opus Genetics, Inc
Chronic Lymphocytic Leukemia, Non-Hodgkin Lymphoma
Cholecalciferol in Newly Diagnosed Non-Hodgkin Lymphoma or Chronic Lymphocytic Leukemia With Vitamin D Deficiency
This randomized pilot early phase I trial studies how well cholecalciferol works in treating patients with newly diagnosed non-Hodgkin lymphoma or chronic lymphocytic leukemia with low levels of vitamin D (vitamin D deficiency).
- Conditions
- Chronic Lymphocytic Leukemia, Non-Hodgkin Lymphoma, Untreated Chronic Lymphocytic Leukemia, Vitamin D Deficiency
- Trial name
- NCT02553447
- Testing
- Cholecalciferol, Laboratory Biomarker Analysis
- Where
- United States
- Volunteers
- 197 people
- Sponsor
- University of Nebraska
Secondary Hyperparathyroidism Due to Renal Causes, Chronic Kidney Diseases
Safety, Efficacy, PK and PD of CTAP101 (Calcifediol) ER Capsules for SHPT in HD Patients VDI
Safety, Efficacy, PK and PD of CTAP101 (calcifediol) ER Capsules for SHPT in HD Patients VDI
- Conditions
- Secondary Hyperparathyroidism Due to Renal Causes, Chronic Kidney Diseases, Vitamin D Deficiency, Stage 5 Chronic Kidney Disease
- Trial name
- NCT03602261
- Testing
- Calcifediol Oral Capsule
- Where
- 18 sites in United States
- Volunteers
- 44 people
- Sponsor
- OPKO Health, Inc.
HIV, Metabolic Syndrome
Incidence of HANA Conditions in HIV-infected Individuals
With the availability of effective anti-retroviral therapy, HIV-infected individuals are expected not to die of AIDS and have longer life expectancy.
- Conditions
- HIV, Metabolic Syndrome, Osteopenia, Osteoporosis
- Trial name
- NCT03483584
- Where
- Hong Kong
- Volunteers
- 215 people
- Sponsor
- Chinese University of Hong Kong
Sickle Cell Disease, Anemia, Sickle Cell
Daily Vitamin D for Sickle-cell Respiratory Complications
This study aims to answer the question whether daily oral vitamin D supplementation can reduce the risk of respiratory or lung complications in children and adolescents with sickle cell disease.
- Conditions
- Sickle Cell Disease, Anemia, Sickle Cell, Anemia, Hemolytic, Congenital, Respiratory Tract Diseases
- Trial name
- ViDAS-2 (NCT04170348)
- Testing
- Daily oral vitamin D3, 3,333 IU, Monthly oral vitamin D3, 100,000 IU
- Where
- United States
- Volunteers
- 58 people
- Sponsor
- Columbia University
Renal Dialysis, Vitamin D Deficiency
Vitamin D Supplementation in Kidney Disease
This is a double-blind placebo controlled pilot study to determine if vitamin D supplementation in hemodialysis (HD) patients will improve physical function and cognition.
- Trial name
- NCT01229878
- Testing
- Cholecalciferol (Vitamin D)
- Where
- United States
- Volunteers
- 20 people
- Sponsor
- VA Office of Research and Development
Chronic Kidney Disease stage3, Chronic Kidney Disease stage4
Phase 3 Safety and Efficacy Study of CTAP101 Extended-release Capsules in Children With Secondary Hyperparathyroidism
This is a phase 3, multi-center, randomized, double-blind, placebo-controlled study in children with stage 3-4 chronic kidney disease (CKD), secondary hyperparathyroidism (SHPT) and vitamin D insufficiency.
- Conditions
- Chronic Kidney Disease stage3, Chronic Kidney Disease stage4, Vitamin d Deficiency, Secondary Hyperparathyroidism
- Trial name
- NCT05543928
- Testing
- CTAP101
- Where
- 2 sites in United States
- Volunteers
- 2 people
- Sponsor
- OPKO Health, Inc.
Prostate Cancer, Vitamin D Deficiency
Vitamin D Supplementation in RNA-seq Profiles of Single-core Prostate Samples, Among Veterans
Veterans between the ages of 50-75, who are having a prostate biopsy, will be recruited for their permission to collect an extra biopsy core for RNA-sequencing.
- Conditions
- Prostate Cancer, Vitamin D Deficiency, Stress Reaction
- Trial name
- VitD/RNA-seq (NCT04621500)
- Testing
- cholecalciferol, Standard of Care Prostate Biopsy - collection of 13th core for RNA-seq, Standard of Care Prostate Biopsies at baseline and after one year vitamin D3 supplementation
- Where
- United States
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Medical University of South Carolina
Chronic Kidney Disease, Hyperparathyroidism, Secondary
Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency
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
- Conditions
- Chronic Kidney Disease, Hyperparathyroidism, Secondary, Vitamin D Deficiency
- Trial name
- NCT01651000
- Testing
- CTAP101 30 μg capsules, Sugar pill to CTAP101 30 μg capsules
- Where
- United States
- Volunteers
- 213 people
- Sponsor
- OPKO IP Holdings II, Inc.
Chronic Kidney Disease, Hyperparathyroidism, Secondary
Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency
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
- Conditions
- Chronic Kidney Disease, Hyperparathyroidism, Secondary, Vitamin D Deficiency
- Trial name
- NCT01704079
- Testing
- CTAP101 30 μg capsules, Sugar pill to CTAP101 30 μg capsules
- Where
- United States
- Volunteers
- 216 people
- Sponsor
- OPKO IP Holdings II, Inc.
Vitamin B1 Deficiency, Thiamine Deficiency
The Effect of SLC19A3 Inhibition on the Pharmacokinetics of Thiamine
In Part 1, subjects will be administered thiamine, thiamine with metformin, and thiamine with trimethoprim. Part 2 will expand on Part 1 and subjects will be administered thiamine and thiamine with trimethoprim.
- Trial name
- NCT03746106
- Testing
- Trimethoprim, Metformin, Vitamin B1
- Where
- United States
- Volunteers
- 7 people, healthy volunteers welcome
- Sponsor
- University of California, San Francisco
Kidney Transplantation, Vitamin D Deficiency
Vitamin D Replacement After Kidney Transplant
Vitamin D deficiency accelerates vascular risk progression after kidney transplant.
- Trial name
- NCT00748618
- Testing
- Standard vitamin D3 treatment, High dose vitamin D3 treatment
- Where
- United States
- Volunteers
- 116 people
- Sponsor
- University of Nebraska
Vitamin D Deficiency, Vitamin D Insufficiency
Evaluating the Effect of SOLIUS UV Light Source in Improving Vitamin D Status
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.
- Trial name
- NCT04780776
- Testing
- UVB treatment
- Where
- United States
- Volunteers
- 69 people, healthy volunteers welcome
- Sponsor
- Boston University
Sickle Cell Disease, Vitamin D Deficiency
Vitamin D for Sickle-cell Respiratory Complications
This study aims to answer the question whether oral vitamin D supplementation can decrease lung complications in children and adolescents with sickle cell disease.
- Conditions
- Sickle Cell Disease, Vitamin D Deficiency, Acute Chest Syndrome, Asthma
- Trial name
- NCT01443728
- Testing
- Experimental: Vitamin D3 100,000 IU, Active Comparator: Vitamin D3 12,000 IU
- Where
- United States
- Volunteers
- 70 people
- Sponsor
- Gary M Brittenham, MD
Vitamin D Deficiency
Vitamin Deficiency in Immigrants, a Treatment Study
The purpose of this study is to determine the efficacy of different doses of vitamin D in persons, immigrated to Sweden from Middle East or Africa, with decreased S vitamin D.
- Trial name
- VIDI2 (NCT01419119)
- Testing
- Cholecalciferol high dose at Vitamin D deficiency, Cholecalciferol median dose at Vitamin D insufficiency, Cholecalciferol low dose at Vitamin D deficiency
- Where
- Sweden
- Volunteers
- 160 people
- Sponsor
- Umeå University
Hypovitaminosis D
Comparing a Novel Phototherapy Kiosk to Oral Vitamin D Supplementation
The purpose of this project is to demonstrate the capability of a standing phototherapy kiosk (SPK) to stimulate cutaneous vitamin D3 and subsequent production of 25 Hydroxyvitamin (OH) D safely and as efficiently as an oral…
- Trial name
- NCT04556136
- Testing
- Standing Phototherapy Kiosk, D3 Oral supplement
- Where
- United States
- Volunteers
- 106 people, healthy volunteers welcome
- Sponsor
- Madigan Army Medical Center
Vitamin D Deficiency, Short Bowel Syndrome
Treatment of Vitamin D Deficiency in Intestinal Rehabilitation Clinic Patients With a Portable Ultraviolet B Lamp
This is a randomized, controlled, unblinded pilot study for patients with vitamin D deficiency in Intestinal Rehabilitation clinic.
- Trial name
- NCT01930539
- Testing
- Ultraviolet B lamp
- Where
- United States
- Volunteers
- 11 people
- Sponsor
- University of Nebraska
Cardiovascular Disease, Chronic Kidney Disease
Vascular Risk After Kidney Transplantation
Hypothesis: Nontraditional risk factors, such as inflammation, vitamin D deficiency, elevated PTH, insulin resistance, homocysteine, or uric acid, contribute to cardiovascular disease progression after kidney transplant.
- Conditions
- Cardiovascular Disease, Chronic Kidney Disease, Diabetes, Vitamin D Deficiency
- Trial name
- NCT00374595
- Where
- United States
- Volunteers
- 338 people
- Sponsor
- University of Nebraska
Development, Vitamin Deficiency
Vitamin B12, Neurodevelopment and Growth in Nepal
Rationale: Globally, vitamin B12 deficiency is one of the most common micronutrient deficiencies. The only relevant source of Vitamin B12 is animal-source foods.
- Conditions
- Development, Vitamin Deficiency, Malnutrition
- Trial name
- BeLive (NCT02272842)
- Testing
- Vitamin B12
- Where
- Nepal
- Volunteers
- 600 people
- Sponsor
- Centre For International Health
Osteoporosis, Osteopenia
Does Treatment of Hypovitaminosis D Increase Calcium Absorption?
The purpose is to perform a one-year study designed to assess whether treatment of hypovitaminosis D increases intestinal absorption of calcium, subsequent retention of calcium within bone, decreases bone turnover, and favorably…
- Conditions
- Osteoporosis, Osteopenia, Vitamin D Deficiency, Hypoparathyroidism
- Trial name
- NCT00581828
- Testing
- Vitamin D
- Where
- United States
- Volunteers
- 19 people, healthy volunteers welcome
- Sponsor
- University of Wisconsin, Madison