How Often Can You Safely Get IV Therapy?
Why there's no single answer, the factors that set safe frequency, and warning signs that you're getting drips too often.
Read guideVitamins
Vitamin C (Ascorbic Acid)
Also known as: ascorbic acid, ascorbate, high-dose vitamin C
A water-soluble antioxidant vitamin. IV delivery reaches far higher blood levels than oral — whether that helps healthy people is unproven.
Medically reviewed by Akash Bhagat, DO, FACEP
What the evidence supports
| Use | Evidence |
|---|---|
| Correcting deficiency (scurvy) | Established |
| Immune support / preventing colds | Unproven |
| Skin brightening (with glutathione) | Limited |
| High-dose use alongside cancer care | Emerging |
Common side effects
- Thirst
- Lightheadedness
- Vein irritation at high doses
Who should be cautious or avoid this
- G6PD deficiency — risk of hemolysis; test before high doses
- History of kidney stones
- Kidney disease
- Iron overload (hemochromatosis)
- Can falsely raise fingerstick glucose readings
What it is
Vitamin C is an essential, water-soluble vitamin involved in collagen formation, wound healing, and immune function, and it acts as an antioxidant.
Why it’s used in IV therapy
Oral absorption falls off as doses rise, so blood levels plateau no matter how much you swallow. IV vitamin C bypasses that limit and can produce blood concentrations many times higher.
What the evidence says
Higher blood levels are real; benefits for healthy people are not established. There’s no good evidence IV vitamin C prevents colds or “boosts immunity.” During the COVID-19 pandemic, the FTC warned multiple clinics to stop claiming IV vitamin C could prevent or treat the disease. High-dose IV vitamin C is being studied as a complement to cancer treatment — that research is ongoing and belongs under an oncologist’s direction, not a wellness menu.
Side effects and cautions
G6PD deficiency is the critical screen — high doses can destroy red blood cells in people with this inherited condition. High doses also increase oxalate, a kidney-stone risk, and are avoided in kidney disease. People with diabetes should know high-dose vitamin C can make some fingerstick glucose meters read falsely high for hours.