Treatment
Vitamin C clinical trials
We’re tracking 51 recruiting studies that include Vitamin C, each written for real people, not researchers, below.
Recruiting studies
- NCT06106646Recruiting
Vitamin C and smoking in pregnancy: long-term lung health follow-up
This study is checking on the long-term lung health of children whose mothers took vitamin C or a placebo during pregnancy and either smoked or did not smoke. It's a follow-up to see if vitamin C might have lasting benefits for their breathing.
Indianapolis, IndianaAges 6–16 - NCT04150042RecruitingPhase 1
Test of chemotherapy plus your own stem cells for metastatic cancer
This Phase 1 trial tests a treatment approach using standard chemotherapy along with stem cells taken from you to treat metastatic pancreatic or breast cancer. It is mainly designed to check safety and find the best way to give the treatment, and it may offer an option for people whose cancer has spread.
Boston, MassachusettsAges 18 years+ - NCT04268849RecruitingPhase 3
IV vs oral iron after weight-loss surgery
This Phase 3 study compares taking iron through an IV versus by mouth to treat iron-deficiency anemia after Roux-en-Y gastric bypass or sleeve gastrectomy. The goal is to see which method works better and is safer for improving iron levels and blood counts.
Baltimore, MarylandAges 18 years+ - NCT05407194Recruiting
Collagen and vitamin C for jumper’s knee pain
This trial tests whether taking collagen plus vitamin C can improve “jumper’s knee” pain in active teens and young adults. It compares a supplement plan to see if symptoms and sports ability improve over time.
Ede, GelderlandAges 16–40 - NCT06601283RecruitingPhase 2/Phase 3
Vitamin C and Cordyceps for Anemia in Pancreatic Cancer
This trial tests whether adding vitamin C and a fungus called cordyceps to standard chemotherapy can help improve anemia (low red blood cells) in people with advanced pancreatic cancer. It's for those who have not yet had treatment for their cancer.
ShanghaiAges 18–80 - NCT04715022RecruitingTeam says not enrollingPhase 1/Phase 2
Vitamin C study for insulin resistance in obesity
This early-stage study tests whether vitamin C (and possibly how your body uses it) affects blood vessel function in people with obesity and insulin resistance. You may be asked to stop certain supplements before starting so researchers can measure the effect more clearly.
Kansas City, KansasAges 35–65 - NCT06794047Recruiting
Vitamin C for IVF in women with low ovarian reserve
This study tests whether taking Vitamin C can improve IVF outcomes for women with low ovarian reserve (DOR). If you are starting your first or second IVF cycle and meet certain health criteria, you may be eligible.
Beijing, Beijing MunicipalityAges 20–45 - NCT03849443RecruitingEarly Phase 1
Testing tranexamic acid to reduce bleeding after spine fusion
This trial studies whether a single dose or multiple doses of tranexamic acid (TXA) can reduce the chance you need a blood transfusion after spine fusion surgery. It also compares two different ways TXA may be given (by mouth and through a vein) to see which approach works best and is safe.
Chicago, IllinoisAges 18 years+ - NCT05913180RecruitingPhase 2
Vitamin C to prevent urine infections after gynecologic surgery
This Phase 2 study tests whether taking vitamin C can lower the chance of getting a urinary tract infection (UTI) after planned gynecologic surgery. It may help people who want to reduce post-surgery infection risk.
MoscowAges 18–80 - NCT07092618RecruitingPhase 2/Phase 3
Trial for keeping weight off after stopping GLP-1 meds
This study tests if other medicines (naltrexone, metformin, or rapamycin) can help people keep off weight they lost while taking GLP-1 drugs like Wegovy or Ozempic, after they stop taking them. It is for AgelessRx patients aged 40 to 85 who have lost at least 15 pounds on GLP-1s.
Chicago, IllinoisAges 40–85 - NCT07383974Recruiting
12-week study: how diet affects skin and health
This trial tests whether eating more fruits and vegetables for 12 weeks can improve your skin and how you feel physically. It uses a special light scanner to measure skin health.
Shanghai, Shanghai MunicipalityAges 18 years+ - NCT07715669RecruitingEarly Phase 1
Antidepressants to improve blood vessel health after preeclampsia
This study looks at whether antidepressant medication can help improve blood vessel health in women who have had preeclampsia or a normal pregnancy. It may help lower future heart risks.
Iowa City, IowaAges 18–45 - NCT03999723RecruitingPhase 2
Test azacitidine with vitamin C to improve DNA changes
This Phase 2 study tests whether combining azacitidine (a standard blood cancer medicine) with vitamin C helps improve disease control by changing DNA activity in high-risk blood cancers. It may be an option if you have certain types of higher-risk MDS, CMML, or low-blast AML and can meet safety requirements.
AalborgAges 18 years+ - NCT04516681RecruitingPhase 3
Ascorbic acid plus immunotherapy for spread colorectal cancer
This trial tests whether intravenous vitamin C (ascorbic acid) combined with an immune treatment (adebrelimab) can slow or shrink metastatic colorectal cancer that can’t be removed with surgery. It focuses on tumors that strongly show a specific marker called GLUT3, and aims to see if the combination works better than standard approaches.
Shanhai, Shanghai MunicipalityAges 18–75 - NCT05842382RecruitingPhase 2
High-dose IV vitamin C for severe pneumonia
This trial tests whether high-dose vitamin C given through an IV can improve outcomes in people with severe pneumonia. It may help your body fight infection and reduce complications, but it also has several safety checks.
Alor Star, KedahAges 18 years+ - NCT06012760Recruiting
Can iron and vitamin C reduce transfusions during heart surgery?
This trial is testing whether giving iron plus vitamin C before heart surgery can reduce the need for blood transfusions. It is for people with low iron and anemia who are scheduled for bypass or valve surgery.
Hangzhou, ZhejiangAges 18 years+ - NCT06018896RecruitingPhase 2
Vitamin C for late-stage pancreatic cancer quality of life
This trial is testing if high-dose vitamin C can improve quality of life for people with advanced pancreatic cancer that has continued to grow after two previous treatments. It aims to see if vitamin C can help patients feel better and possibly slow the cancer.
Shanghai, Shanghai MunicipalityAges 18–80 - NCT06379997Recruiting
Oral supplement vs. shoulder injection for rotator cuff pain
This trial compares taking an oral supplement versus getting hyaluronic acid injections for ongoing shoulder pain due to a partial rotator cuff tear. It aims to see which treatment works better for improving movement and reducing pain without surgery.
Roma, RMAges 30–80 - NCT06598033RecruitingPhase 2/Phase 3
Vitamin C and Cordyceps for quality of life in advanced pancreatic cancer
This trial tests whether a combination of high-dose vitamin C and cordyceps (a type of fungus used in traditional medicine) can improve quality of life for people with late-stage pancreatic cancer that has progressed after two prior treatments. It looks at how these supplements affect your well-being and daily living.
ShanghaiAges 18–80 - NCT06968936Recruiting
Long-term outcomes of pre-surgery iron therapy
This study looks at long-term results of giving iron before major heart surgery to people with low iron levels. It aims to see if this treatment helps recovery and outcomes.
Hangzhou, ZhejiangAges 18–85 - NCT07227740Recruiting
Testosterone treatment for blood vessel health after spinal cord injury
This study looks at whether low testosterone affects blood vessel health in men with recent spinal cord injury. It tests if testosterone replacement can help improve blood vessel function.
Englewood, ColoradoAges 18–89 - NCT07227727Recruiting
Blood vessel health after spinal cord injury
This study looks at how spinal cord injury affects the health of your blood vessels. It compares people with paraplegia to those without an injury to understand the differences.
Englewood, ColoradoAges 18 years+ - NCT00071526Recruiting
How the body loses vitamin C in diabetes
This study looks at why people with diabetes may lose more vitamin C in their urine than people without diabetes. By understanding this difference, researchers hope to better understand how diabetes affects the body's nutrition.
Bethesda, MarylandAges 18–65 - NCT03049462RecruitingPhase 1
Study how a beta-3 drug changes body fat in healthy adults
This Phase 1 study tests how chronic treatment with a beta-3–type medicine affects brown fat (a special kind of body fat) in the body. It mainly looks at safety and how the body responds over time, which could help future treatments for weight and metabolic health.
Bethesda, MarylandAges 18–40
Common questions
- Are there clinical trials studying Vitamin C?
- Yes. Clin2 currently lists 51 recruiting studies that include Vitamin C, drawn from the U.S. registry and rewritten for real people so you can see what each is testing and who it's for.
- How do I know if I qualify for a Vitamin C trial?
- Each study lists its own eligibility criteria — rules about condition, age, and prior treatments. On every Clin2 trial page we explain these in plain language and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Is Vitamin C an approved treatment?
- A drug being studied in a trial may be investigational (still being tested) or already approved and being studied for a new use. Each study page explains what phase it's in. Clin2 does not provide medical advice — talk with your doctor about whether Vitamin C or a specific trial is right for you.
Related treatments
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. A drug appearing here is being studied in a trial and may be investigational. Talk with your doctor about whether a specific treatment or trial is right for you.