All of the clinical trials listed in US Database
Update May 2018: 82 trials
A few of the clinical trials
| Health Concern | trials | |
| Abortion, Spontaneous | 1 | |
| Anemia | 3 | |
| Anemia, Hypochromic | 1 | |
| Anemia, Iron-Deficiency | 1 | |
| Asthma | 1 | |
| Autistic Disorder | 1 | |
| Avitaminosis | 15 | |
| Behavioral Symptoms | 1 | |
| Birth Weight | 7 | |
| Body Weight | 7 | |
| Bone Diseases | 1 | |
| Bone Diseases, Metabolic | 1 | |
| Bronchial Diseases | 1 | |
| Bronchopulmonary Dysplasia | 1 | |
| Calcium Metabolism Disorders | 2 | |
| Child Development Disorders, Pervasive | 1 | |
| Children's Interstitial Lung Disease | 5 | |
| Communicable Diseases | 4 | |
| Death | 1 | |
| Deficiency Diseases | 15 | |
| Depression | 1 | |
| Depression, Postpartum | 1 | |
| Depressive Disorder | 1 | |
| Developmental Disabilities | 1 | |
| Diabetes Mellitus | 2 | |
| Diabetes, Gestational | 2 | |
| Eclampsia | 5 | |
| Eczema | 1 | |
| Endocrine System Diseases | 1 | |
| Endometriosis | 1 | |
| Fetal Diseases | 4 | |
| Fetal Growth Retardation | 5 | |
| Genital Diseases, Female | 3 | |
| Genital Diseases, Male | 2 | |
| Gingival Diseases | 1 | |
| Glucose Metabolism Disorders | 2 | |
| Growth Disorders | 4 | |
| Hematologic Diseases | 1 | |
| Hypercalcemia | 1 | |
| Hypersensitivity | 1 | |
| Hypersensitivity, Immediate | 1 | |
| Hypertension | 6 | |
| Hypertension, Pregnancy-Induced | 5 | |
| Hypocalcemia | 1 | |
| Immune System Diseases | 1 | |
| Infant, Newborn, Diseases | 3 | |
| Infant, Premature, Diseases | 1 | |
| Infection | 4 | |
| Infertility | 2 | |
| Inflammation | 1 | |
| Insulin Resistance | 2 | |
| Iron Metabolism Disorders | 1 | |
| Lung Diseases | 2 | |
| Lung Diseases, Obstructive | 1 | |
| Lung Injury | 1 | |
| Malaria | 1 | |
| Malnutrition | 16 | |
| Mental Disorders | 2 | |
| Mental Disorders Diagnosed in Childhood | 1 | |
| Metabolic Diseases | 5 | |
| Metabolic Syndrome X | 1 | |
| Mood Disorders | 1 | |
| Mouth Diseases | 1 | |
| Musculoskeletal Diseases | 1 | |
| Nutrition Disorders | 16 | |
| Obesity | 2 | |
| Obstetric Labor Complications | 3 | |
| Obstetric Labor, Premature | 3 | |
| Overnutrition | 1 | |
| Overweight | 1 | |
| Parasitic Diseases | 1 | |
| Pediatric Obesity | 1 | |
| Periodontal Diseases | 1 | |
| Pre-Eclampsia | 7 | |
| Pregnancy Complications | 17 | |
| Pregnancy in Diabetics | 1 | |
| Premature Birth | 3 | |
| Protozoan Infections | 1 | |
| Psychotic Disorders | 2 | |
| Puerperal Disorders | 1 | |
| Recurrence | 1 | |
| Respiratory Hypersensitivity | 1 | |
| Respiratory Tract Diseases | 3 | |
| Respiratory Tract Infections | 1 | |
| Rickets | 1 | |
| Signs and Symptoms | 7 | |
| Stomatognathic Diseases | 1 | |
| Syndrome | 1 | |
| Vascular Diseases | 2 | |
| Ventilator-Induced Lung Injury | 1 | |
| Vitamin D Deficiency | 16 | |
| Water-Electrolyte Imbalance | 1 | |
Healthy pregnancies need lots of vitamin D has the following summary
Most were taking 2,000 to 7,000 IU daily for >50% of pregnancy
Click on hyperlinks for details
Problem | Vit. D Reduces | Evidence |
| 0. Chance of not conceiving | 3.4 times | Observe |
| 1. Miscarriage | 2.5 times | Observe |
| 2. Pre-eclampsia | 3.6 times | RCT |
| 3. Gestational Diabetes | 3 times | RCT |
| 4. Good 2nd trimester sleep quality | 3.5 times | Observe |
| 5. Premature birth | 2 times | RCT |
| 6. C-section - unplanned | 1.6 times | Observe |
| Stillbirth - OMEGA-3 | 4 times | RCT - Omega-3 |
| 7. Depression AFTER pregnancy | 1.4 times | RCT |
| 8. Small for Gestational Age | 1.6 times | meta-analysis |
| 9. Infant height, weight, head size within normal limits | RCT | |
| 10. Childhood Wheezing | 1.3 times | RCT |
| 11. Additional child is Autistic | 4 times | Intervention |
| 12.Young adult Multiple Sclerosis | 1.9 times | Observe |
| 13. Preeclampsia in young adult | 3.5 times | RCT |
| 14. Good motor skills @ age 3 | 1.4 times | Observe |
| 15. Childhood Mite allergy | 5 times | RCT |
| 16. Childhood Respiratory Tract visits | 2.5 times | RCT |
RCT = Randomized Controlled Trial