High-dose vitamin C IV delivers vitamin C (ascorbic acid) straight into a vein, which raises blood levels far higher than swallowing a supplement can. At Venturis Clinic in Oklahoma City, vitamin C IVs are ordered after a Good Faith Exam, require a G6PD screening blood test first, and are given by our nurses. This page covers how it works, who may and may not be a candidate, what a visit looks like, and the safety steps we follow.
What high-dose vitamin C IV is
Vitamin C is an essential nutrient. Your body can’t make it, so it has to come from food or supplements. It helps build collagen, supports normal immune function and acts as an antioxidant.
When you take vitamin C by mouth, your gut limits how much gets absorbed, so blood levels plateau even at large oral doses. An IV bypasses the gut. That is why IV and oral vitamin C are not interchangeable, and why high IV doses need screening and monitoring.
How IV vitamin C differs from oral vitamin C
- Absorption: oral absorption is capped by the gut; IV is not.
- Blood levels: IV can reach levels many times higher than oral dosing.
- Side effects: high oral doses commonly cause loose stools and cramping; IV avoids most gut effects but carries its own risks, listed below.
- Screening: high-dose IV requires a G6PD test and a look at kidney function first.
Who may consider it
Patients ask about vitamin C IV for reasons such as:
- Nutrient support during busy, stressful or run-down periods
- Low vitamin C intake or absorption problems
- Recovery support after illness, including people living with long COVID
- As part of a broader plan that may include other IVs, such as glutathione IV
These are reasons people ask, not promised results. Whether vitamin C IV fits you is decided after your Good Faith Exam. If you are in cancer care, vitamin C IV is only ever discussed alongside your oncologist; see our supportive care page.
Who should not have high-dose vitamin C IV
- G6PD deficiency. High doses can break down red blood cells (hemolysis). We require a G6PD result before your first high-dose infusion.
- Kidney disease or a history of kidney stones. Vitamin C is partly converted to oxalate, which can raise stone risk.
- Iron overload (hemochromatosis). Vitamin C increases iron absorption.
- Pregnancy or breastfeeding, unless cleared by your obstetric provider.
- Heart failure or fluid restrictions, because of the fluid volume involved.
Our vitamin C IV options
Vitamin C appears in several drips on our IV menu, from the Myers’ cocktail and Immunity IV to our Tri-Immune formula with glutathione and zinc. A separate high-dose vitamin C infusion is a specialty IV with its own screening. Your dose and schedule are set by our medical staff based on your labs and goals.
Formulas are prepared by an FDA-registered 503B outsourcing facility under cGMP standards and tested for sterility and potency. They are ordered after your Good Faith Exam and given by our nurses. Compounded IV formulas are not FDA-approved to diagnose, treat, cure or prevent any disease.
What a visit looks like
- Good Faith Exam. Licensed medical staff review your history, medications and labs, including G6PD and kidney function.
- Your infusion. Services are performed by licensed medical staff under our medical director. A nurse places a small IV line in your arm. Higher doses run slowly, so plan on roughly one to two hours.
- Monitoring. We check how you feel during and after the drip.
- Afterward. Most people return to normal activities the same day. Drink water and eat normally.
Safety, side effects and lab interference
- Common: mild vein discomfort, thirst, lightheadedness or tiredness
- Bruising or irritation at the IV site
- Low blood sugar symptoms in some people if they haven’t eaten
- Rare but serious: hemolysis in people with undiagnosed G6PD deficiency, which is why screening is required
Glucose meters: high blood levels of vitamin C can falsely raise readings on some fingerstick glucose meters for several hours after an infusion. If you have diabetes, tell us before your visit. Vitamin C can also affect some other lab tests, so let your other clinicians know if you’ve had a recent infusion.
Cost
Pricing for our standard drips is listed on the IV menu. High-dose vitamin C is dosed individually, so cost is discussed at consult.
High-dose vitamin C IV FAQ
Why do I need a G6PD test?
People with G6PD deficiency can have red blood cell breakdown with high-dose vitamin C. A simple blood test rules this out before your first high-dose infusion.
Is IV vitamin C better than taking it by mouth?
They do different things. Oral vitamin C covers everyday needs. IV reaches much higher blood levels, which is only appropriate for some people after screening.
How long does a vitamin C IV take?
Standard drips with vitamin C take about 30 to 60 minutes. High-dose infusions run slower, often one to two hours.
How often can I get vitamin C IV?
That depends on your goals, labs and how you respond. Your schedule is set after your Good Faith Exam.
Is vitamin C IV FDA-approved?
Compounded IV vitamin C formulas are not FDA-approved to diagnose, treat, cure or prevent any disease. We use them as nutrient support only.
Do you offer mobile vitamin C IVs?
Some drips are available through our mobile IV service after a Good Faith Exam. High-dose vitamin C is given in the clinic.
Book a free discovery call
Not sure which IV fits you? Book a free 15-minute discovery call or call (405) 848-7246. Venturis Clinic, 7917 N. May Ave, Oklahoma City, OK 73120, serving Oklahoma City and surrounding areas, including Tulsa.
This page is educational and is not medical advice. Individual results vary.
By Venturis Clinic