Here’s a big list of randomized control trial experiments involving vitamin D:

Does High Dose Vitamin D Supplementation Enhance Cognition? A Randomized Trial in Healthy Adults (2017)

Conclusion: Supplementing with 4,000 IU of vitamin D3 a day was found to be effective for improving non-verbal memory in adults – especially in deficient subjects.

 

Linking Vitamin D Status, Executive Functioning and Self-Perceived Mental Health in Adolescents Through Multivariate Analysis: A Randomized Double-Blind Placebo Control Trial (2017)

Conclusion: A randomized double-blind placebo-controlled trial involving 50 Norwegian adolescents found that those given vitamin D supplements performed better on cognitive tests compared to the placebo group.

 

Vitamin D Supplementation for Premenstrual Syndrome-Related Mood Disorders in Adolescents with Severe Hypovitaminosis D (2016)

Conclusion: In a randomized control trial involving 158 vitamin D-deficient teenage girls and young women, the girls given high doses of vitamin D adequate for correcting their deficiencies experienced significantly less severe PMS over the four-month period compared to the placebo group.

 

Effect of Vitamin D3 on Self-Perceived Fatigue: A Double-Blind Randomized Placebo-Controlled Trial (2016)

Conclusion: A study of 120 vitamin D-deficient adults complaining of fatigue were enrolled in a 4-week-long double-blind placebo-controlled trial where they were either given a single dose of 100,000 IU of vitamin D or a placebo. The vitamin D group reported experiencing significantly improved energy levels compared to the placebo group and more members of the vitamin D group reported being cured entirely of fatigue symptoms. The study also found that those who experienced the biggest increases in their vitamin D levels also experienced the biggest improvements in their fatigue symptoms.

 

Randomized Controlled Trial of Vitamin D Supplementation in Children with Autism Spectrum Disorder (2016)

Conclusion: In a 4-month, double-blinded, randomized clinical trial involving 109 autistic children from six different autism treatment centers in Assiut City, Egypt, those receiving vitamin D therapy showed significant improvement in their autism symptoms compared to the placebo group.

 

The Influence of Winter Vitamin D Supplementation on Muscle Function and Injury Occurrence in Elite Ballet Dancers: A Controlled Study (2014)

Conclusion: A four-month study of 24 ballet dancers found that those supplementing with 2000 IU of vitamin D daily were isometrically stronger, could jump higher, and suffered fewer injuries compared to the control group.

 

Vitamin D Prevents Cognitive Decline and Enhances Hippocampal Synaptic Function in Aging Rats (2014)

Conclusion: Rats given higher doses of vitamin D performed better in cognitive tests compared to rats given lower doses of vitamin D.

 

Vitamin D Increases Cellular Turnover and Functionally Restores the Skeletal Muscle After Crush Injury in Rats (2013)

Conclusion: In a study where male rats were given crush injuries, those given a giant dose of vitamin D recovered faster.

 

Increased Telomerase Activity and Vitamin D Supplementation in Overweight African Americans (2012)

Conclusion: A 4-month double-blind randomized placebo-controlled trial of 37 obese black adults found that those given vitamin D supplementation experienced a significant increase in telomerase activity, suggesting that vitamin D “may improve telomere maintenance and prevent cell senescence and counteract obesity-induced acceleration of cellular aging.”

 

Assessment of Vitamin D Concentration in Non-Supplemented Professional Athletes and Healthy Adults During the Winter Months in the UK: Implications for Skeletal Muscle Function (2012)

Conclusion: A study of athletes in the UK found that 62% had low vitamin D levels. 8 weeks of ingesting 5,000 IU of vitamin D daily significantly improved sprinting and vertical jump performance compared to the placebo group.

 

Randomized Trial of Vitamin D Supplementation and Risk of Acute Respiratory Infection in Mongolia (2012)

Conclusion: In a randomized control trial involving 247 Mongolian schoolchildren during winter, those given a measly 300 IU of vitamin D daily through vitamin D-fortified milk experienced fewer acute respiratory infections compared to school children given non-fortified milk.

 

Effect of Vitamin D Supplementation on Testosterone Levels in Men (2011)

Conclusion: A year-long randomized control trial involving 162 men found that those who supplemented with 3,000 IU of vitamin D daily experienced significant testosterone increases compared to the placebo group.

 

A 16-Week Randomized Clinical Trial of 2000 International Units Daily Vitamin D3 Supplementation in Black Youth: 25-Hydroxyvitamin D, Adiposity, and Arterial Stiffness (2010)

Conclusion: A 4-month study of 44 black teenagers found that 95% had low vitamin D levels and that supplementing with 2,000 IU of vitamin D daily was effective for reducing arterial stiffness and increasing vitamin D levels. The study also found that the vitamin D levels of the obese subjects rose less than the leaner subjects. Although 2,000 IU daily was effective in raising levels, only 56% achieved sufficient levels after the four months.

 

Randomized Trial of Vitamin D Supplementation to Prevent Seasonal Influenza A in Schoolchildren (2010)

Conclusion: In this randomized, double-blind, placebo-controlled trial involving 334 school children over a 4-month period, the vitamin D group experienced nearly 50% fewer colds and even fewer asthma attacks compared to the placebo group.

 

Fall Prevention with Supplemental and Active Forms of Vitamin D: A Meta-Analysis of Randomised Controlled Trials (2009)

Conclusion: “Supplemental vitamin D in a dose of 700-1000 IU a day reduced the risk of falling among older individuals by 19%.”

 

Vitamin D and Calcium Supplementation Reduces Cancer Risk: Results of a Randomized Trial (2008)

Conclusion: In a four-year population-based, double-blind, randomized placebo-controlled trial involving 1179 postmenopausal Nebraska women, women receiving a daily dose of 1500mg/day of supplemental calcium and 1100 IU/day of Vitamin D had a 77% lower risk for all types of cancer compared to the placebo group.

 

A Higher Dose of Vitamin D Reduces the Risk of Falls in Nursing Home Residents: A Randomized, Multiple-Dose Study (2007)

Conclusion: In a 5-month study of 124 nursing home residents, those given 800 IU of vitamin D daily suffered 72% fewer falls compared to the placebo group.

 

Effect of Vitamin D Replacement on Musculoskeletal Parameters in School Children: A Randomized Controlled Trial (2006)

Conclusion: For a one-year period 179 girls ages 10-17 were given either a weekly placebo, low dose of vitamin D, or higher dose of vitamin D. After one year the girls given the higher dose of vitamin D showed the biggest increase in lean muscle mass and bone density, especially among the younger girls.

 

Effect of Cholecalciferol Plus Calcium on Falling in Ambulatory Older Men and Women: A 3-Year Randomized Controlled Trial (2006)

Conclusion: In a 3-year-long randomized, double-blind, placebo-controlled experiment of elderly men and women, 700 IU of vitamin D and 500mg of calcium supplemented daily proved to be effective for reducing the risk of falling in the women by 46%.

 

Vitamin D and Cancer (2006)

Conclusions: Two groups of mice were given subcutaneous implantations of mouse colon cancer cells. One group was severely vitamin D-deficient, the other group had much higher vitamin D levels. 19 days later the vitamin D-deficient mice had tumors that were 60% larger than the mice with the better vitamin D levels.

 

Fracture Prevention With Vitamin D Supplementation: A Meta-analysis of Randomized Controlled Trials (2005)

Conclusion: Oral vitamin D supplementation between 700 to 800 IU/d appears to reduce the risk of hip and any nonvertebral fractures in ambulatory or institutionalized elderly persons.”

 

Low-Dose Vitamin D Prevents Muscular Atrophy and Reduces Falls and Hip Fractures in Women After Stroke: A Randomized Controlled Trial (2005)

Conclusion: A two-year study of 96 elderly, female stroke victims found that those supplementing with 1000 IU of vitamin D2 daily suffered fewer falls and hip fractures, demonstrated improved muscular strength, and enjoyed an increase in the number and size of type 2 muscle fibers compared to the placebo group.

 

Vitamin D Requirements During Lactation: High-Dose Maternal Supplementation as Therapy to Prevent Hypovitaminosis D for Both the Mother and the Nursing Infant (2004)

Conclusion: This randomized control trial found that breastfeeding mothers need at least 4,000 IU of vitamin D daily to ensure their breastfeeding infants are getting enough vitamin D.

 

Randomized Comparison of the Effects of the Vitamin D3 Adequate Intake Versus 100 mcg (4000 IU) Per Day on Biochemical Responses and the Wellbeing of Patients (2004)

Conclusion: Two randomized trials where participants were either given 600 IU of vitamin D daily or 4,000 IU of vitamin D daily for three months found that those given the higher dose of 4,000 IU had better vitamin D levels and better well-being scores upon evaluation at the end of the trial.

 

Calcium Absorption Varies Within the Reference Range for Serum 25-Hydroxyvitamin D (2003)

Conclusion: Researches found from two experiments that increasing people’s vitamin D levels significantly improves calcium absorption.

 

The Effect of Vitamin D3 on Insulin Secretion and Peripheral Insulin Sensitivity in Type 2 Diabetic Patients (2003)

Conclusion: In a control trial experiment involving ten vitamin D-deficient type-2 diabetic women and 17 same-age, same-weight, non-diabetic females, taking just 1300 IU of vitamin D daily was found to be effective for increasing vitamin D levels by 75% and decreasing insulin resistance by 21%. “ We suggest vitamin D3 deficiency may at least partly contribute to the impairment of insulin secretion and probably of insulin action. Our results suggest that vitamin D3 supplementation could be an element in the complex treatment of type 2 diabetes.”

 

Effects of Vitamin D and Calcium Supplementation on Falls: A Randomized Controlled Trial (2003)

Conclusion: In this study of 122 elderly female nursing home residents, those given 800 IU of vitamin D daily for three months experienced 49% fewer falls compared to those not given vitamin D.

 

Effect of Four Monthly Oral Vitamin D3 (Cholecalciferol) Supplementation on Fractures and Mortality in Men and Women Living in the Community: Randomised Double-Blind Controlled Trial (2003)

Conclusion: A five-year randomized control trial involving 2,686 elderly men and women found that those receiving a 100,000 IU dose of vitamin D3 every four months suffered fewer fractures compared to the placebo group and had a slightly lower mortality rate.

 

Calcium and Vitamin D Supplements Reduce Tooth Loss in the Elderly (2001)

Conclusion: In a three year-long randomized control trial involving 145 subjects over the age of 65, those who took calcium and vitamin D supplements had better tooth retention compared to the placebo group.

 

Effects of a Short-Term Vitamin D(3) and Calcium Supplementation on Blood Pressure and Parathyroid Hormone Levels in Elderly Women (2001)

Conclusion: A study of 148 vitamin D-deficient elderly women found that supplementing with 1200mg of calcium and 800 IU of vitamin D daily was effective for measurably lowering blood pressure.

 

Effects of a Short-Term Vitamin D and Calcium Supplementation on Body Sway and Secondary Hyperparathyroidism in Elderly Women (2000)

Conclusion: A 1-year study of 148 elderly women found that those given a daily dose of 800 IU of vitamin D enjoyed 9% less body sway and fewer falls than the non-vitamin D group. Researchers concluded that vitamin D and calcium supplementation may prevent falls and fall-related fractures.

 

Hypovitaminosis D Myopathy Without Biochemical Signs of Osteomalacic Bone Involvement (2000)

Conclusion: Osteomalacia patients experienced improved physical performance following three months of vitamin D treatment. Another study was performed on 55 vitamin D-deficient veiled Arab women living in Denmark who were experiencing reduced muscle function due to hypovitaminosis D myopathy. They were put on high-dose vitamin D treatment for 6 months and showed improved muscle function after 3 months and 6 months compared to a control group.

 

Decreased Bioavailability of Vitamin D in Obesity (2000)

Conclusion: In vitamin D experiments carried out on a group of 19 obese people and a group of 19 normal weight people, the obese group experienced 57% lower vitamin D level increases following UVB irradiation compared to the non-obese group.

 

Vitamin D vs Broad Spectrum Phototherapy in the Treatment of Seasonal Affective Disorder (1999)

Conclusion: In this particular randomized control trial, high-dose vitamin D therapy proved to be an effective treatment for alleviating depressive symptoms of seasonal affective disorder. Could winter vitamin D-deficiency resulting from reduced UVB solar radiation be playing a role in seasonal affective disorder?

 

Vitamin D Enhances Mood in Healthy Subjects During Winter (1998)

Conclusion: This random double-blind placebo-controlled trial found vitamin D3 supplementation to be significantly effective for alleviating depression from seasonal affective disorder.

 

1,25-Dihydroxycholecalciferol Inhibits the Progression of Arthritis in Murine Models of Human Arthritis (1998)

Conclusion: Vitamin D is an effective treatment for reducing arthritis symptoms in mice.

 

Bright Light Treatment of Winter Depression: A Placebo-Controlled Trial (1998)

Conclusion: In a randomized control trial experiment involving 96 seasonal affective disorder patients, three weeks of bright light therapy proved to have an antidepressant effect on winter depression sufferers.

 

A Controlled Study of Light Therapy in Women with Late Luteal Phase Dysphoric Disorder (1998)

Conclusion: In a 6-month randomized control trial comparing the effects of 10,000 lx bright light with 500 lx placebo light on women with late luteal phase dysphoric disorder, it was found that bright light therapy (you know, like SUNLIGHT) was effective for significantly reducing PMS symptoms and improving mood.

 

1,25-Dihydroxycholecalciferol Inhibits the Progression of Arthritis in Murine Models of Human Arthritis (1998)

Conclusion: Vitamin D is an effective treatment for reducing arthritis symptoms in mice.

 

Effect of Calcium and Vitamin D Supplementation on Bone Density in Men and Women 65 Years of Age or Older (1997)

Conclusion: In a 3-year, double-blind, placebo-controlled trial involving 389 elderly people, the group being treated with calcium and vitamin D had better bone density and fewer nonvertebral fractures at the end of the three years compared to the placebo group.

 

1,25-Dihydroxyvitamin D3 Reversibly Blocks the Progression of Relapsing Encephalomyelitis, a  Model of Multiple Sclerosis (1996)

Conclusion: Administration of vitamin D was shown to be effective for completely preventing and stopping the progression of a multiple sclerosis-like autoimmune disease artificially induced in mice. Cessation of vitamin D administration resulted in a resumption of the disease’s progression.

 

Efficacy and Safety of Topical Calcitriol (1,25-dihydroxyvitamin d3) for the Treatment of Psoriasis (1996)

Conclusion: Topical vitamin D is a safe and effective treatment for psoriasis.

 

Maternal Consumption of a Low Vitamin D Diet Retards Metabolic and Contractile Development in the Neonatal Rat Heart (1995)

Conclusion: In a randomized control trial with rats, low maternal intake of vitamin D resulted in offspring with smaller hearts compared to offspring from mothers with higher vitamin D intake.

 

Morning Bright Light Therapy for Sleep and Behavior Disorders in Elderly Patients with Dementia (1994)

Conclusion: Morning bright light therapy was shown to be effective for improving sleep and behavior disorders in demented elderly patients.

 

Vitamin D3 and Calcium to Prevent Hip Fractures in Elderly Women (1992)

Conclusion: In an 18-month-long randomized control trial experiment involving 3,270 elderly women, participants being treated with supplemental calcium and vitamin D suffered 32% fewer nonvertebral fractures compared to a placebo group.

 

Vitamin D Supplements Enhance Weight Gain and Nutritional Status in Pregnant Asians (1981)

Conclusion: In a randomized control trial of pregnant Asian women living in Britain, the mothers receiving vitamin D supplementation gained weight at a faster rate in their third trimester and had heavier babies.

 

Vitamin D Supplements in Pregnant Asian Women: Effects on Calcium Status and Fetal Growth (1980)

Conclusion: In a double-blind, placebo-controlled experiment involving 126 pregnant Asian women in their last trimester, those given 1000 IU of vitamin D2 gained weight faster and gave birth to bigger babies with adequate vitamin D levels and slight skeletal development differences compared to the placebo group.

 

Cod Liver Oil: A Five-Year Study of its Value for Reducing Industrial Absenteeism Caused by Colds and Respiratory Disease (1936)

Conclusion: In a five-year study, daily ingestion of vitamin D-rich cod liver oil was found to be effective for reducing the number of colds worker’s experienced.

 

Also see

Epidemiological Vitamin D Studies

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