Clinical trials: Vitamin C
Healthy
Effect of Blueberries on Vascular Function in Healthy Men
Scientific question to be addressed: To determine the effects of acute blueberry ingestion on vascular function and blood pressure in humans Hypothesis: Acute consumption of blueberry induces an improvement in blood pressure and…
- Trial name
- NCT01292954
- Testing
- Blueberries
- Where
- United Kingdom
- Volunteers
- 10 people, healthy volunteers welcome
- Sponsor
- University of Reading
Ocular Physiology, Regional Blood Flow
Effects of Vitamin C on Hyperoxia-Induced Reduction of Retinal Blood Flow
High arterial blood oxygen tension leads to vasoconstriction of retinal vessels, possibly related to an interaction between reactive oxygen species and endothelium-derived vasoactive factors.
- Trial name
- NCT00712907
- Testing
- vitamin C (Mayrhofer) 24mg/min i.v. for 64 min, 100% O2 (AGA) two times for 12 min
- Where
- Austria
- Volunteers
- 12 people, healthy volunteers welcome
- Sponsor
- Medical University of Vienna
Male Infertility
Effect of Eurycoma Longifolia (DLBS5055) and Multivitamins (Vitamin C+Vitamin E+ β-carotene) for Infertile Males
Infertility is defined as the inability of a couple to get pregnant after one year of regular and unprotected sexual intercourse.
- Trial name
- NCT06100432
- Testing
- DLBS5055 200mg, Multivitamin (Vitamin C 500mg + Vitamin E 100IU + Beta Carotene 10000IU)
- Where
- Indonesia
- Volunteers
- 90 people, healthy volunteers welcome
- Sponsor
- Duta Wacana Christian University
Obesity
Trigona Honey and Intestinal Microbiota Among Obese People
Objective : Nutrition intervention is one of the approaches to deal with obesity. Natural honey with its polyphenol component has an impact on the intestinal microbiota and lipid profile.
- Trial name
- NCT04974450
- Testing
- Trigona honey, control
- Where
- Indonesia
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Hasanuddin University
Cicatrix
Efficacy and Safety of Silicone Cream Containing Allium Cepa Extract
The objectives of this study were to evaluate efficacy and safety of silicone cream containing Allium Cepa extract in post-cesarean surgical scars treatment.
- Trial name
- NCT04233320
- Testing
- silicone cream containing Allium Cepa extract, Commercial scar gel
- Volunteers
- 22 people, healthy volunteers welcome
- Sponsor
- Chulalongkorn University
Stress, Psychological
Effect of Low Doses of Vitamin C on Salivary Cortisol , Heart Rate , Blood Pressure During Group Presentation
Vitamin C (ascorbic acid) is a well-known antioxidant that is involved in anxiety, stress, depression, fatigue and mood state in humans .
- Trial name
- NCT04135378
- Testing
- ascorbic acid
- Where
- Iraq
- Volunteers
- 90 people, healthy volunteers welcome
- Sponsor
- Kufa University
Iron Deficiency (Without Anemia)
Effect of Chitin and Ascorbic Acid on Dietary Insect Iron Absorption
Iron is involved in many vital metabolic processes such as oxygen transport, electron transport in cells, DNA synthesis and repair, and muscle metabolism.
- Trial name
- INSECTE (NCT06822062)
- Testing
- Meal A, Meal B, Meal C
- Where
- Switzerland
- Volunteers
- 25 people, healthy volunteers welcome
- Sponsor
- Swiss Distance University of Applied Sciences
Pulmonary Function; Newborn, Abnormal, Infant Wheeze
Vitamin C to Decrease Effects of Smoking in Pregnancy on Infant Lung Function
Vitamin C supplementation (500 mg per day) given to pregnant women who can not quit smoking will improve the pulmonary function tests in their offspring measured at 3 months of age.
- Conditions
- Pulmonary Function; Newborn, Abnormal, Infant Wheeze, In-utero Nicotine, Second Hand Smoke
- Trial name
- VCSIP (NCT01723696)
- Testing
- Vitamin C +prenatal vitamin
- Where
- 2 sites in United States
- Volunteers
- 252 people, healthy volunteers welcome
- Sponsor
- Oregon Health and Science University
Vitamin C Deficiency
"Novo C Plus" Vitamin C Containing Dietary Supplement Bioavailability in Healthy Subjects
The aim of this study is to evaluate the bioavailability of "Novo C Plus" vitamin C containing dietary supplement compared to licensed vitamin C medications. The novelty of this product is the liposomal formulation.
- Trial name
- NCT02606773
- Testing
- Ascorbic Acid
- Where
- Hungary
- Volunteers
- 32 people, healthy volunteers welcome
- Sponsor
- Semmelweis University
Healthy, Hyperlipidemias
Effect of Goji Berry Consumption on Biochemical Parameters
Goji Berry as a functional food have been shown to reduce risk of hyperlipidemia, type 2 diabetes, etc. However, human studies are limited in this area.
- Trial name
- NCT06190587
- Testing
- Goji Berry
- Where
- Cyprus
- Volunteers
- 70 people, healthy volunteers welcome
- Sponsor
- Eastern Mediterranean University
Iron Deficiency, Anemia
Iron Absorption From Complementary Food Fortificants (CFFs) and Acceptability of CFFs by Beninese Children
Iron deficiency (ID) is still a main public health problem in sub-Saharan Africa. Iron deficient children have an increased risk for anemia which is associated with adverse infant development that might be partly irreversible.
- Trial name
- NCT01321099
- Testing
- NaFeEDTA, Phytase, Vitamin C
- Where
- Benin
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Swiss Federal Institute of Technology
Upper Respiratory Infections, Lower Respiratory Tract Infections
Nutritional Intervention and Respiratory Infections in Older Subjects
Poor Ecuadorian older people suffer from chronic dietary deficiencies of zinc, iron, copper, vitamins C, B6, B12, D, and folic acid.
- Trial name
- NCT01971112
- Testing
- Multivitamins and minerals
- Where
- Ecuador
- Volunteers
- 320 people, healthy volunteers welcome
- Sponsor
- Corporacion Ecuatoriana de Biotecnologia
Vitamin D Deficiency, 25-Hydroxyvitamin D3 Deficiency, Selective
Effect of Vitamin D3 Supplementation in Children From 12 to 30 Months of Age.
Background Vitamin D (VD) is essential for calcium absorption, bone health and growth in children. In a national representative sample authors found mean serum concentration of 25-Hydroxi-Vitamin-D (25-OH-D) of 59 nmol/L, in…
- Trial name
- NCT03544671
- Testing
- Vitamin D
- Where
- Mexico
- Volunteers
- 220 people, healthy volunteers welcome
- Sponsor
- Instituto Nacional de Salud Publica, Mexico
Vitamin D Deficiency, Vitamin D Insufficiency
ALPCO 25(OH) Vitamin D CLIA Kit - Fresh Versus Frozen Serum and Plasma Stability Study
This study evaluates the stability of 25-hydroxyvitamin D [25(OH)D] measurements in human serum and plasma using the ALPCO 25(OH) Vitamin D CLIA Kit.
- Conditions
- Vitamin D Deficiency, Vitamin D Insufficiency, Healthy Volunteers
- Trial name
- NCT07565064
- Testing
- ALPCO 25(OH) Vitamin D CLIA Kit
- Where
- United States
- Volunteers
- 80 people, healthy volunteers welcome
- Sponsor
- American Laboratory Products Company
Hyperhomocysteinemia
Effects of Low-dose Complex B-vitamins on Homocysteine and Framingham Risk Score Among Chinese Elderly
The purpose of this study is to evaluate whether low dose complex B-vitamins (folic acid,vitamin B6 and vitamin B12) can lower the risk of developing hyperhomocysteinemia in an apparently healthy population with low folate/B12…
- Trial name
- NCT00755664
- Testing
- Low-dose complex B-vitamins
- Where
- China
- Volunteers
- 390 people, healthy volunteers welcome
- Sponsor
- Peking University
Bariatric Surgery, Osteoporosis
Skeletal Health in Bariatric Surgery Patients
The investigators propose a prospective cohort trial that will help to understand the impact of Roux-en-Y gastric bypass (RYGB) and sleeve gastrectomy (SG) in pre- and post-menopausal female bariatric patients.
- Conditions
- Bariatric Surgery, Osteoporosis, Fractures, Bone, Roux En-Y Gastric Bypass
- Trial name
- NCT03331536
- Testing
- Roux en Y Gastric Bypass Pre-menopausal, Roux en Y Gastric Bypass Post-menopausal, Sleeve Gastrectomy Pre-menopausal
- Where
- United States
- Volunteers
- 27 people, healthy volunteers welcome
- Sponsor
- University of Alabama at Birmingham
Healthy
Acute and Chronic Effects of 100% Florida Orange Juice Consumption on Cognitive Performance in 7-10 Year Old Children
This study is a 10-week intervention study to examine the acute and chronic effects of daily intake of a 100 % orange juice drink vs control drink on cognitive performance.
- Trial name
- NCT02725775
- Testing
- 100% Florida OJ
- Where
- United Kingdom
- Volunteers
- 90 people, healthy volunteers welcome
- Sponsor
- University of Leeds
Undernutrition
Early Child Development and Nutrition in Guatemala
Over 200 million children under the age of 5 years in low and middle-income countries do not reach their developmental potential, largely due to lack of adequate nutrients and lack of psychosocial stimulation.
- Trial name
- NCT02302729
- Testing
- Micronutrients, Responsive feeding
- Where
- Guatemala
- Volunteers
- 1,730 people, healthy volunteers welcome
- Sponsor
- University of Maryland, Baltimore
Raloxifene, Postmenopausal Women
Raloxifene on Coagulation System in the Postmenopausal Women
Objective: The aim of this study is to assess the effects of raloxifene HCl on coagulation parameters in healthy postmenopausal women.
- Trial name
- NCT04454775
- Testing
- coagulation system parameters; factor 8, von Willebrand factor, protein C, protein S, antithrombin III and fibrinogen were studied.
- Volunteers
- 80 people, healthy volunteers welcome
- Sponsor
- Karadeniz Technical University
Fontan Procedure, Hypoplastic Left Heart Syndrome
Impact of Vitamin C on Endothelial Function and Exercise Capacity in Fontan-Palliated Patients
In this study, investigators will evaluate the effect of vitamin C on endothelial function, exercise tolerance and quality of life in patients with a single ventricle who have been palliated to Fontan physiology.
- Conditions
- Fontan Procedure, Hypoplastic Left Heart Syndrome, Tricuspid Atresia
- Trial name
- NCT00974025
- Testing
- Vitamin C
- Where
- United States
- Volunteers
- 53 people, healthy volunteers welcome
- Sponsor
- University of Michigan