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Evidence suggests Vitamin D mayincreaseVitamin d levels.
74 studies (84 claims)
Moderate consensus
Typical effective dose 7000 (2875–27500) IUacross 16 dosed studies
Study Claims
| Intervention | Direction | Endpoint | Type | Population | Dosage | Title |
|---|---|---|---|---|---|---|
| 150,000 IU of vitamin D supplementation | Increases - a significant positive correlation was found | immunoglobulin G and 25-Hydroxy Vitamin D levels | Human | vitamin D deficient women who received the COVID-19 vaccine | 150,000 IU of vitamin D (single dose). | Impact of vitamin D3 supplementation on COVID-19 vaccine response and immunoglobulin G antibodies in deficient women: A randomized controlled trial.cited 14× |
| 150,000 IU of vitamin D supplementation | No effect - no correlation was found | initial serum immunoglobulin G and 25-Hydroxy Vitamin D levels | Human | vitamin D deficient women who received the COVID-19 vaccine | 150,000 IU of vitamin D (single dose). | Impact of vitamin D3 supplementation on COVID-19 vaccine response and immunoglobulin G antibodies in deficient women: A randomized controlled trial.cited 14× |
| 150,000 IU of vitamin D supplementation | Increases - were found to increase regularly | serum 25-Hydroxy Vitamin D levels | Human | vitamin D deficient women who received the COVID-19 vaccine | 150,000 IU of vitamin D (single dose). | Impact of vitamin D3 supplementation on COVID-19 vaccine response and immunoglobulin G antibodies in deficient women: A randomized controlled trial.cited 14× |
| daily oral vitamin D (2000 IU) | No effect - remained stable | Vitamin D levels | Human | treated subjects | 38 mg/kg daily | Autologous umbilical cord blood infusion followed by oral docosahexaenoic acid and vitamin D supplementation for C-peptide preservation in children with Type 1 diabetes.cited 37× |
| afamelanotide in combination with vitamin D supplements | Increases - did go up | vitamin D levels | Human | people with EPP | Not specified | The effects of cholecalciferol and afamelanotide on vitamin D levels in erythropoietic protoporphyria: a multicentre cohort study.cited 3× |
| Metformin and vitamin D treatment | Increases - increased | serum vitamin D levels | Human | — | Not specified | Efficacy of metformin combined with vitamin D in the treatment of polycystic ovarian syndrome: A meta-analysis. |
| Vitamin D supplementation | Increases - increased | 25-hydroxy vitamin D levels | Human | women of reproductive age group | Not specified | Effect of vitamin A, calcium and vitamin D fortification and supplementation on nutritional status of women: an overview of systematic reviews.cited 12× |
| vitamin D supplementation | Increases - were in the acceptable range | 25 OH vitamin D levels | Human | 19-year-old girl with persistent hypercalcemia | Not specified | Persistent hypercalcemia with similar familial Hypocalciuric hypercalcemia features: a case report and literature review.cited 2× |
| vitamin D(3) supplementation | Decreases - were lower | 25[OH]-vitamin D(2) levels | Human | subjects from a randomized, double-blind, placebo-controlled clinical trial | 2 g calcium (frequency not specified). | Effects of vitamin D3 and calcium supplementation on serum levels of tocopherols, retinol, and specific vitamin D metabolites.cited 11× |
| vitamin D(3) supplementation | Increases - increased | Serum 25[OH]-vitamin D(3) levels | Human | subjects from a randomized, double-blind, placebo-controlled clinical trial | 2 g calcium (frequency not specified). | Effects of vitamin D3 and calcium supplementation on serum levels of tocopherols, retinol, and specific vitamin D metabolites.cited 11× |
| vitamin D(3) plus calcium | Decreases - were lower | 25[OH]-vitamin D(2) levels | Human | subjects from a randomized, double-blind, placebo-controlled clinical trial | 2 g calcium (frequency not specified). | Effects of vitamin D3 and calcium supplementation on serum levels of tocopherols, retinol, and specific vitamin D metabolites.cited 11× |
| vitamin D(3) plus calcium | Increases - increased | Serum 25[OH]-vitamin D(3) levels | Human | subjects from a randomized, double-blind, placebo-controlled clinical trial | 2 g calcium (frequency not specified). | Effects of vitamin D3 and calcium supplementation on serum levels of tocopherols, retinol, and specific vitamin D metabolites.cited 11× |
| Vitamin D supplementation | Increases - appeared to be the strongest factor associated with adequate level of vitamin D levels | adequate level of vitamin D levels | Human | older persons with hip fracture | Not specified | Vitamin D supplementation is required to normalize serum level of 25OH-vitamin D in older adults: an observational study of 974 hip fracture inpatients.cited 10× |
| vitamin D supplementation | No effect - effects | plasma vitamin D levels | Human | breast cancer survivors | 4000 IU of vitamin D3 daily. | Assessment the effect of vitamin D supplementation on plasma vitamin D levels, inflammation, and oxidative stress biomarkers based on vitamin D receptor genetic variation in breast cancer survivors: a protocol for clinical trial.cited 2× |
| vitamin D supplementation | No effect - should be performed before prescribing | serum 25-hydroxy-vitamin D (25OH-D) levels | Human | many people at high risk to have low vitamin D levels | 4000 IU/day for adults | Vitamin D Dosing: Basic Principles and a Brief Algorithm (2021 Update).cited 34× |
| vitamin D supplementation | Increases - rarely raises | serum vitamin D levels | Human | — | Not specified (discusses "prolonged and disproportionate consumption"). | Can adverse effects of excessive vitamin D supplementation occur without developing hypervitaminosis D?cited 45× |
| Vitamin D supplementation | Increases - resulted in significant improvements | serum vitamin D levels | Human | patients with ulcerative colitis | ≥ 300,000 IU/day (for vitamin D, not explicitly for calcium). | Effects of vitamin D supplementation on blood markers in ulcerative colitis patients: a systematic review and meta-analysis.cited 4× |
| Supplementation with vitamin D at a dose of ≥ 300,000 IU/day | Increases - can improve | serum vitamin D levels | Human | — | ≥ 300,000 IU/day (for vitamin D, not explicitly for calcium). | Effects of vitamin D supplementation on blood markers in ulcerative colitis patients: a systematic review and meta-analysis.cited 4× |
| Supplementation with a sufficient dose of vitamin D in a short period of time | Increases - can also improve | serum vitamin D levels | Human | — | ≥ 300,000 IU/day (for vitamin D, not explicitly for calcium). | Effects of vitamin D supplementation on blood markers in ulcerative colitis patients: a systematic review and meta-analysis.cited 4× |
| vitamin D supplementation | Increases - significantly increased | serum vitamin D levels | Human | stage II-III colorectal cancer patients undergoing adjuvant chemotherapy | 10,000 IU/day | The Effect of Vitamin D Supplementation on Quality of Life in Stage II-III Colorectal Cancer Patients Undergoing Adjuvant Chemotherapy: A Single-Blind, Randomized Controlled Trial. |
| Vitamin D supplementation | Decreases - can reduce | the valproate-associated decline in vitamin D levels | Human | children, 2-12 y of age with newly diagnosed epilepsy, and vitamin D sufficient status, and started on valproate monotherapy | 600 IU vitamin D daily | Effect of Daily Vitamin D Supplementation on Serum Vitamin D Levels in Children with Epilepsy Receiving Sodium Valproate Monotherapy: A Randomized, Controlled Trial.cited 7× |
| daily oral 600 IU vitamin D supplementation | Increases - increase seen | vitamin D levels | Human | children, 2-12 y of age with newly diagnosed epilepsy, and vitamin D sufficient status, and started on valproate monotherapy | 600 IU vitamin D daily | Effect of Daily Vitamin D Supplementation on Serum Vitamin D Levels in Children with Epilepsy Receiving Sodium Valproate Monotherapy: A Randomized, Controlled Trial.cited 7× |
| vitamin D supplementation (600 IU daily) | No effect - recommended dietary allowance | vitamin D levels | Human | children aged over 12 months and during pregnancy and lactation | 400 IU vitamin D₃ daily for infants at risk of low vitamin D. | Vitamin D and health in pregnancy, infants, children and adolescents in Australia and New Zealand: a position statement.cited 131× |
| vitamin D supplementation | Increases - were significant differences | vitamin D levels | Human | T2DM patients | 100 mg of elemental calcium administered twice daily. | A prospective randomized controlled trial of the effects of vitamin D supplementation on long-term glycemic control in type 2 diabetes mellitus of Korea.cited 48× |
| vitamin D supplementation | Increases - noticeably higher | Vitamin D levels | Human | ESRD males (case group) | 50,000 units weekly for 3 months. | Assessment of the relationship between vitamin D with semen analysis parameters and reproductive hormones levels before and after kidney transplantation: An Iranian randomized and double-blinded study. |
| vitamin D supplementation | Increases - should consider | vitamin D levels | Human | People at risk of vitamin D deficiency | Not available | Impact of level of vitamin D in the body on the severity of COVID-19 - review of the literature.cited 1× |
| vitamin D supplementation | Increases - increased | vitamin D levels | Human | experimental group (older women with low BMD and vitamin D insufficiency) | Not specified | Vitamin D supplementation associated with 12-weeks multimodal training in older women with low bone mineral density: A randomized double-blind placebo-controlled trial.cited 2× |
| Vitamin D supplementation | No effect - effects are transient | vitamin D levels | Human | — | Not mentioned | Interventions for Prevention and Control of Epidemic of Vitamin D Deficiency.cited 6× |
| vitamin D supplementation | Increases - pooled standardized mean difference in | vitamin D levels | Human | patients with moderate to severe asthma who were treated with corticosteroids | Not specified | Vitamin D can safely reduce asthma exacerbations among corticosteroid-using children and adults with asthma: a systematic review and meta-analysis of randomized controlled trials.cited 16× |
| vitamin D supplementation | Increases - increased | vitamin D levels | Human | participants in the intervention arm | 3,000 IU per day | Vitamin D supplementation in people with IBS has no effect on symptom severity and quality of life: results of a randomised controlled trial.cited 17× |
| vitamin D supplementation | No effect - could potentially identify 'optimal' vitamin D levels | vitamin D levels | Human | those at risk | Not specified | Vitamin D status: a U-shaped relationship for SARS-CoV-2 seropositivity in UK healthcare workers.cited 1× |
| vitamin D supplementation | Increases - improved | vitamin D levels | Human | HSCT patients | 1000 IU/day to 60,000 IU/week. | The Role of Vitamin D in Hematopoietic Stem Cell Transplantation: Implications for Graft-versus-Host Disease-A Narrative Review.cited 3× |
| vitamin D supplementation | Increases - significant increases | vitamin D levels | Human | SLE patients | 4000 IU and 8000 IU daily. | Effects of Vitamin D Supplementation on Fatigue and Disease Activity in Systemic Lupus Erythematosus. |
| vitamin D supplementation | Increases - requires | vitamin D levels | Human | renal patients | Not specified | Guidelines for vitamin supplements in chronic kidney disease patients: what is the evidence?cited 15× |
| vitamin D supplement | Increases - serological vitamin D levels returned to normal range | serological vitamin D levels | Human | 12-year-old girl with early-onset periodontitis and vitamin D deficiency | Not specified | A case of early-onset periodontitis with vitamin D deficiency: A case report and literature review.cited 1× |
| current dosing regimens of vitamin D supplementation | No effect - are not effective at maintaining | sufficient vitamin D levels | Human | the Duchenne population | >1000 International Units (IU) daily | A systematic literature review and meta-analysis of the effectiveness of vitamin D supplementation for patients with Duchenne muscular dystrophy.cited 2× |
| vitamin D supplementation dose | No effect - No significant association was found between | serum vitamin D levels | Human | the Duchenne population | >1000 International Units (IU) daily | A systematic literature review and meta-analysis of the effectiveness of vitamin D supplementation for patients with Duchenne muscular dystrophy.cited 2× |
| vitamin D supplements | Increases - showed improvement | serum vitamin D levels | Human | children with vernal keratoconjuctivits (VKC) | Not specified | Serum vitamin D levels in children with vernal keratoconjunctivitis - A study from a tertiary care pediatric hospital of North India.cited 1× |
| Vitamin D | Decreases - lower | serum vitamin D levels | Human | patients suffering from intestinal diseases, including inflammatory bowel disease, irritable bowel syndrome, and celiac disease | Not specified | Contemporary Perspectives on the Role of Vitamin D in Enhancing Gut Health and Its Implications for Preventing and Managing Intestinal Diseases.cited 5× |
| vitamin D | Decreases - Lower levels have been found | vitamin D levels | Human | patients with several autoimmune diseases | — | Is vitamin D a player or not in the pathophysiology of autoimmune thyroid diseases?cited 105× |
| vitamin D | Decreases - are significantly lower | vitamin D levels | Human | HT patients compared to healthy people | Not specified | Autoimmune Thyroiditis and Vitamin D.cited 13× |
| Vitamin D | Decreases - deficiency in patients with severe psychiatric disorders | Vitamin D levels | Human | patients with severe psychiatric disorders, including MDD | Not specified | Vitamin D and N-Acetyl Cysteine Supplementation in Treatment-Resistant Depressive Disorder Patients: A General Review.cited 4× |
| vitamin D | No effect - is recommended to be monitored annually | vitamin D levels | Human | patients receiving PN | Not specified | Australasian society for parenteral and enteral nutrition (AuSPEN) adult vitamin guidelines for parenteral nutrition.cited 20× |
| vitamin D (50,000 units per week) | Increases - significantly increased | Vitamin D levels | Human | people with vitamin D deficiency | 50,000 units per week | Metabolic effects of vitamin D supplementation in vitamin D deficient patients (a double-blind clinical trial).cited 14× |
| vitamin D | Decreases - revealed an inverse correlation | vitamin D levels and the occurrence of diabetes mellitus | Human | — | Not specified | The Role of Vitamin D and Its Molecular Bases in Insulin Resistance, Diabetes, Metabolic Syndrome, and Cardiovascular Disease: State of the Art.cited 53× |
| Stoss-dosed vitamin D | Increases - mean total 25-OHD level was significantly higher than | total 25-hydroxy vitamin D (25-OHD) levels | Human | patients in the Stoss cohort | Single, oral, weight-based ultra-high dose (Stoss dosing; exact dosage not specified). | Ultra-High Dose Vitamin D in Pediatric Hematopoietic Stem Cell Transplantation: A Nonrandomized Controlled Trial.cited 9× |
| high dose oral vitamin D supplementation | Increases - was more | median change in plasma vitamin D levels | Human | patients with SLE | High dose (weekly 60,000 U for 5 weeks, then 60,000 U monthly) and routine dose (30,000 U monthly). | Clinical and serological association of plasma 25-hydroxyvitamin D (25(OH)D) levels in lupus and the short-term effects of oral vitamin D supplementation.cited 4× |
| high-dose oral vitamin D supplementation | Increases - seems safe and more effective in improving | vitamin D levels | Human | patients with SLE | High dose (weekly 60,000 U for 5 weeks, then 60,000 U monthly) and routine dose (30,000 U monthly). | Clinical and serological association of plasma 25-hydroxyvitamin D (25(OH)D) levels in lupus and the short-term effects of oral vitamin D supplementation.cited 4× |
| 6,000 IU vitamin D daily for 12 weeks | Increases - a median increase in vitamin D levels | vitamin D levels | Human | children and adolescents with obesity and hypovitaminosis D | 6,000 IU daily | Response to vitamin D replacement therapy in obese children and adolescents with vitamin D deficiency: a randomized controlled trial.cited 1× |
| oral vitamin D regimens | Increases - achieved | serum vitamin D levels | Human | children/adolescents with asthma and body mass index ≥ 85% for age/sex | 50,000 IU loading dose followed by 8,000 IU daily. | Vitamin D Oral Replacement in Children With Obesity Related Asthma: VDORA1 Randomized Clinical Trial.cited 3× |
| Vitamin D supplementation given to infants at 400 IU/day | Increases - may increase | 25-OH vitamin D levels | Human | healthy term breastfed infants | Infant supplementation: 400 IU/day; maternal supplementation: varied from 400 IU/day to >4000 IU/day, with some studies using 60,000 IU/day for short periods. | Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health.cited 46× |
| Infant vitamin D supplementation (400 IU/day) | Increases - compared to lactating mother supplementation may increase | infant 25-OH vitamin D levels | Human | infants at high risk of vitamin D deficiency | Infant supplementation: 400 IU/day; maternal supplementation: varied from 400 IU/day to >4000 IU/day, with some studies using 60,000 IU/day for short periods. | Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health.cited 46× |
| Vitamin D supplementation given to lactating mothers | Increases - may increase | infant 25-OH vitamin D levels | Human | infants of lactating mothers | Infant supplementation: 400 IU/day; maternal supplementation: varied from 400 IU/day to >4000 IU/day, with some studies using 60,000 IU/day for short periods. | Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health.cited 46× |
| Vitamin D alone | No effect - appears as effective as | restoring serum vitamin D levels | Human | older community dwelling and institutionalised patients | 1000 mg calcium combined with 800 IU vitamin D3 (for the composite supplement group). | Vitamin D supplementation versus combined calcium and vitamin D in older female patients - an observational study.cited 8× |
| vitamin D alone | Increases - were at least as likely to achieve normalisation | serum vitamin D levels | Human | community dwellers and institutionalised patients | 1000 mg calcium combined with 800 IU vitamin D3 (for the composite supplement group). | Vitamin D supplementation versus combined calcium and vitamin D in older female patients - an observational study.cited 8× |
| vitamin D replacement | Increases - require | Low 25(OH) vitamin D levels | Human | — | Not specified | Nutritional recommendations for the management of sarcopenia.cited 427× |
| Healthy Conversation Skills plus vitamin D supplementation | Increases - exploring the synergistic effect | vitamin D levels | Human | pregnant women | Vitamin D supplementation (1000 IU cholecalciferol). | Southampton PRegnancy Intervention for the Next Generation (SPRING): protocol for a randomised controlled trial.cited 20× |
| Vitamin D 1000 IU/day | Increases - significantly higher | 25-hydroxy vitamin D (25-OHD) levels | Human | very low birth weight preterm neonates | 400 IU/day (Group 1) or 1000 IU/day (Group 2). | Assessment of Adequacy of Supplementation of Vitamin D in Very Low Birth Weight Preterm Neonates: A Randomized Controlled Trial.cited 20× |
| adequate diet that includes vitamin D rich components | Increases - appropriate lifestyle changes | vitamin D levels | Human | human beings | Suggested sunlight exposure: 15 min/day; vitamin D supplementation: 2,000 IU or higher. | Vitamin D, sunlight and longevity.cited 2× |
| Supplementation with vitamin D 10,000 IU/day for 8 weeks | Increases - can increase | vitamin D levels | Human | — | 10,000 IU/day and 5,000 IU/day | Randomized controlled trial of vitamin d supplementation on toll-like receptor-2 (tlr-2) and toll-like receptor-4 (tlr-4) in tuberculosis spondylitis patients.cited 1× |
| low-fat milk and yogurt fortified with vitamin D | Increases - significantly differed | Serum Vitamin D levels | Human | all individuals (PSST < 19, PSST 19-28, and PSST > 28) | — | Effect of dairy products fortified with vitamin d |
| >800 IU/day vitamin D supplementation | Increases - significantly improved | Vitamin D levels | Human | 98 patients undergoing OAGB | >800 IU/day vitamin D supplementation. | Trends in Serum Vitamin D Levels within 12 Months after One Anastomosis Gastric Bypass (OAGB).cited 2× |
| vitamin D fortification of foods | Increases - may increase | vitamin D levels | Human | — | Not specified. | Vitamin D food fortification in European countries: the underused potential to prevent cancer deaths.cited 24× |
| vitamin D supplementation (cholecalciferol) 2500 IU/day | Increases - increase | serum vitamin D levels | Human | infertile men (vitamin D deficient, otherwise healthy men) | 2500 IU/day (cholecalciferol) | Treatment With Cholecalciferol Leads to Increase Of Selected Semen Parameters in Young Infertile Males: Results of a 6-month Interventional Study. |
| serum vitamin D levels | No effect - were | serum vitamin D levels | Human | COVID-19-positive and COVID-19-negative pregnant women | Not specified | The Vitamin D Serum Levels in Pregnant Women Affected by COVID-19: A Systematic Review and Meta-Analysis.cited 3× |
| serum vitamin D levels | Decreases - generally had lower | serum vitamin D levels | Human | KD patients | Not available | Exploring the association between serum Vitamin D levels and the development of coronary artery lesions in Kawasaki disease - a systematic review. |
| serum vitamin D levels | No effect - no significant difference | serum vitamin D levels | Human | KD patients | Not available | Exploring the association between serum Vitamin D levels and the development of coronary artery lesions in Kawasaki disease - a systematic review. |
| serum vitamin D levels | Decreases - tend to decline | serum vitamin D levels | HumanAnimalMolecular | individuals with POI | Not specified | Loss of vitamin D receptor induces premature ovarian insufficiency through compromising the 7-dehydrocholesterol-dependent anti-aging effects. |
| 50,000 IU weekly of vitamin D supplementation | Increases - showed a significant increase | median serum vitamin D levels | Human | patients with a history of calcium stones and vitamin D deficiency | 1,000 IU daily or 50,000 IU weekly. | Vitamin D Repletion in Kidney Stone Formers: A Randomized Controlled Trial.cited 16× |
| 1,000 IU daily of vitamin D supplementation | Increases - showed a nonsignificant median increase | serum vitamin D levels | Human | patients with a history of calcium stones and vitamin D deficiency | 1,000 IU daily or 50,000 IU weekly. | Vitamin D Repletion in Kidney Stone Formers: A Randomized Controlled Trial.cited 16× |
| 2000 IU/day vitamin D for 6 months | Increases - significant increase | vitamin D levels | Human | children with biopsy-proven NAFLD | 2000 IU/day. | Vitamin D and nonalcoholic fatty liver disease in children: a randomized controlled clinical trial.cited 20× |
| vitamin D substitution | Increases - increased | median vitamin D levels | Human | patients | Median weekly dose of 20,000 IU. | Course of Vitamin D Levels in Newly Diagnosed Non-Metastatic Breast Cancer Patients over One Year with Quarterly Controls and Substitution.cited 1× |
| vitamin D deficiency | Decreases - can coexist along with Graves' disease | vitamin D levels | Human | — | Not mentioned | IMPACT OF GRAVES' DISEASE AND ANTITHYROID DRUG THERAPY ON BONE MINERAL DENSITY - PATHOPHYSIOLOGICAL MECHANISMS AND CLINICAL RELEVANCE.cited 1× |
| transdermal route of vitamin D | Increases - is potentially safe and can give desired results | vitamin D levels | Human | — | Top-D 1 g (containing 5000 IU of vitamin D3) applied daily. | Topical vitamin D3: A randomized controlled trial (RCT).cited 9× |
| forced dosing regimen of vitamin D | Increases - significant increase | vitamin D levels | Human | bariatric patients | Loading dose (100,000 IU on day 1, then 2 and 4 weeks post-surgery) followed by maintenance dose (3420 IU/day). Control group received placebo followed by 3420 IU/day. | The link between obesity and vitamin D in bariatric patients with omega-loop gastric bypass surgery - a vitamin D supplementation trial to compare the efficacy of postoperative cholecalciferol loading (LOAD): study protocol for a randomized controlled trial.cited 11× |
| combination therapy of Vitamin D and Canagliflozin | Increases - significantly improved | serum Vitamin D levels | Animal | male Wistar rats | Not specified in the abstract. | Vitamin D and canagliflozin combination alleviates Parkinson's disease in rats through modulation of RAC1/NF-κB/Nrf2 interaction. |
| vitamin D mega-dose | Increases - normalized | serum vitamin D levels | Human | patients | Mega-dose (exact dosage not specified in abstract). | Safety and effectiveness of vitamin D mega-dose: A systematic review.cited 10× |
| 400 IU of oral vitamin D supplementation | No effect - administered | vitamin D levels at 1 month of age | Human | preterm infants with birth weight <1500 g or gestational age <32 weeks | 400 IU of oral vitamin D supplementation after birth. | Association between vitamin D deficiency at one month of age and bronchopulmonary dysplasia.cited 4× |
| high-dose short-term vitamin D intervention | Increases - might be a way to elevate children's serum vitamin D levels | serum vitamin D levels | Human | children | 2000 IU/day | A randomized trial of vitamin D supplementation to prevent seasonal influenza and enterovirus infection in children.cited 10× |
| SRP + vitamin D | Increases - had a statistically significant effect on | serum vitamin D levels | Human | individuals with periodontitis | Not specified | Association of vitamin D in individuals with periodontitis: an updated systematic review and meta-analysis.cited 17× |
| vitamin D replacement therapy | Increases - observed an increase | blood vitamin D levels | Human | 28 patients who developed ME/CFS after COVID-19 vaccination | Not specified | Efficacy of vitamin D replacement therapy on 28 cases of myalgic encephalomyelitis/chronic fatigue syndrome after COVID-19 vaccination. |
| higher doses of vitamin D | Increases - may be required to maintain | normal vitamin D levels | Human | patients while on CKRT | Not specified | Vitamin D and metabolic bone disease in prolonged continuous kidney replacement therapy: a prospective observational study. |
| Stabilization splint with Vitamin D supplementation | No effect - no significant difference was seen | Vitamin D levels | Human | patients with low Vitamin D and TMDs | Not specified | Effectiveness of Vitamin D along with Splint therapy in the Vit D deficient patients with Temporomandibular disorder-A Randomized, double-blind, placebo-controlled clinical trial.cited 8× |
| high dose of 1600 IU of vitamin D | Increases - did result in higher | serum vitamin D levels | Human | — | WBV training protocol not specified; vitamin D doses were 880 IU/day (conventional) and 1600 IU/day (high). | The effects of whole-body vibration training and vitamin D supplementation on muscle strength, muscle mass, and bone density in institutionalized elderly women: a 6-month randomized, controlled trial.cited 88× |
| Daily vitamin D dose, as determined by the Food and Nutrition Board in 1997 | Decreases - is now rather insufficient | vitamin D levels | Human | — | 800-1,000 U/day for adults with inadequate sun exposure. | Vitamin D supplementation in adults - guidelines.cited 17× |
| maximal vitamin D levels (50 μg/day) in actually available food supplements | No effect - the biggest problem being associated with | vitamin D levels | Human | — | 800-1,000 U/day for adults with inadequate sun exposure. | Vitamin D supplementation in adults - guidelines.cited 17× |
| vitamin D and docosahexaenoic acid (DHA) co-supplementation | No effect - had no effect on | vitamin D levels | Human | children receiving both vitamin D and DHA | 500 mg of DHA and 1200 IU/day of vitamin D3. | Effect of Vitamin D and Docosahexaenoic Acid Co-Supplementation on Vitamin D Status, Body Composition, and Metabolic Markers in Obese Children: A Randomized, Double Blind, Controlled Study.cited 7× |
| enteral high-dose vitamin D supplementation | Increases - less than half of the patients reached adequate vitamin D levels | adequate vitamin D levels | Human | patients | 569,600 IU vitamin D (single dose). | Efficacy and safety of enteral supplementation with high-dose vitamin D in critically ill patients with vitamin D deficiency.cited 3× |