Crick
HomeTrialsGenesDrugs23andMeGraphBlogContact
  • Home
  • Trials
  • Genes
  • Drugs
  • 23andMe
  • Graph
  • Blog
  • Contact
Crick

An open-source clinical intelligence platform. Explore clinical trials, gene networks, and molecular structures using public data sources.

Data Sources

  • ClinicalTrials.gov
  • OpenTargets
  • ClinVar
  • PubChem

Links

  • Contact
  • About
  • Privacy

© 2026 Crick. All rights reserved.

Crick is for educational purposes only. Not medical advice.

Results for “Vitamin D Supplement”

143 trials

Filters

Phase
Early Phase 1
Phase 1
Phase 2
Phase 3
Phase 4
Status
Recruiting
Active, Not Recruiting
Not Yet Recruiting
Completed
Enrolling by Invitation

Showing 20 of 143 results

Large-scale testing (Phase 3)Ended earlyNCT04483635
What this trial is testing

PRevention of COVID-19 With Oral Vitamin D Supplemental Therapy in Essential healthCare Teams

Who this might be right for
COVID-19
St. Justine's Hospital 34
Large-scale testing (Phase 3)Study completedNCT00092066
What this trial is testing

Evaluate the Safety, Tolerability, and Efficacy of an Investigational Drug and Dietary Supplement in Men and Postmenopausal Women With Osteoporosis (0217A-227)

Who this might be right for
OsteoporosisVitamin D Deficiency
Organon and Co 717
Large-scale testing (Phase 3)Study completedNCT01190137
What this trial is testing

Study Comparing Two Isoforms of Vitamin D Supplements for Infants

Who this might be right for
Healthy
McGill University 52
Large-scale testing (Phase 3)Study completedNCT04405960
What this trial is testing

Role of Alphacalcidol Supplement to Reduce Pain and COMP in Geriatric Knee Osteoarthritis Patients

Who this might be right for
Osteoarthritis, KneeAged
Syarif Hidayatullah State Islamic University Jakarta 146
Not applicableStudy completedNCT04709744
What this trial is testing

Impact of Vitamin D Level and Supplement on SLE Patients During COVID-19 Pandemic

Who this might be right for
Covid19
Mansoura University 38
Large-scale testing (Phase 3)WithdrawnNCT02138591
What this trial is testing

Therapeutic Benefit of Preoperative Supplemental Vitamin D in Patients Undergoing Major Surgical Procedures.

Who this might be right for
Vitamin d Deficiency
University of Missouri, Kansas City
Not applicableNot Yet RecruitingNCT07127796
What this trial is testing

Non-inferiority RCT on Fish Waste-Derived vs. Synthetic Vitamin D Supplementation in Healthy Adults With Suboptimal Vitamin D Levels

Who this might be right for
Vitamin DDietary Supplement
University of Bologna 48
Not applicableEnded earlyNCT02166333
What this trial is testing

Study To Understand Fall Reduction and Vitamin D in You

Who this might be right for
Vitamin D DeficiencyFalls
Johns Hopkins University 688
Not applicableStudy completedNCT03860194
What this trial is testing

Effects of Dietary Supplements on Sarcopenic Elders

Who this might be right for
Sarcopenia
Far Eastern Memorial Hospital 85
Not applicableUnknownNCT01339741
What this trial is testing

Efficacy of Vitamin D3 for the Treatment of Psoriatic Patients With Vitamin D Deficiency and Insufficiency

Who this might be right for
Psoriasis VulgarisVitamin D Deficiency
Chulalongkorn University 30
Not applicableStudy completedNCT06845995
What this trial is testing

Effects of a Synbiotic Supplement on Metabolic & Cognitive Outcomes Among Older Adults

Who this might be right for
Older AdultsBioelectrical ImpedanceAppetite Hormones+3 more
Texas Tech University 32
Not applicableStudy completedNCT07310329
What this trial is testing

High-Dose Vitamin D Supplementation and Exercise Effects on Vitamin D Metabolites in Professional Football Players

Who this might be right for
Vitamin D Deficiency (10 ng/mL to 30 ng/mL)AthletesFootball Players+1 more
Wroclaw University of Health and Sport Sciences 20
Not applicableStudy completedNCT06028607
What this trial is testing

Feasibility of Consumption of Nutritional Supplementation in Primary Ciliary Dyskinesia

Who this might be right for
Primary Ciliary Dyskinesia
University of Leeds 15
Testing effectiveness (Phase 2)Looking for participantsNCT05043116
What this trial is testing

High-dose Vitamin D Supplement for the Prevention of Acute Asthma-like Symptoms in Preschool Children

Who this might be right for
Asthma in Children
Copenhagen Studies on Asthma in Childhood 320
Not applicableStudy completedNCT01295034
What this trial is testing

Vitamin D Supplements for HIV-positive Patients on cART

Who this might be right for
HIV-associated Co-morbidities
Andrea Branch 62
Not applicableStudy completedNCT01463813
What this trial is testing

Finnish Vitamin D Trial (FIND)

Who this might be right for
Cardiovascular DiseasesCancer
University of Eastern Finland 2,495
Not applicableLooking for participantsNCT07534852
What this trial is testing

NIMA-Colon Cancer Study

Who this might be right for
Colon Cancer
Fundación Pública Andaluza para la Investigación de Málaga en Biomedicina y Salud 120
Not applicableStudy completedNCT01524874
What this trial is testing

Comparative Effectiveness of Vitamin D and Repletion Strategies

Who this might be right for
Hypovitaminosis DInsulin ResistanceDiabetes
Bastyr University 66
Not applicableStudy completedNCT02945683
What this trial is testing

Effects of Lactobacillus Reuteri Plus Vitamin D3 in Children With Atopic Dermatitis

Who this might be right for
Atopic Dermatitis
Noos S.r.l. 88
Not applicableStudy completedNCT02876315
What this trial is testing

The Effect of Combinatorial Nutritional Supplementation on Immune Function in Healthy Older Adults

Who this might be right for
Vitamin D Deficiency
Oregon State University 42
Load More Results