IV & NAD+ Therapy
IV Vitamin Therapy for Cold and Flu Season: What the Evidence Shows
IV vitamin drips are popular in cold and flu season, but what does the evidence actually show? Here is what randomized trials say about IV and oral vitamin C, hydration, and what may help.
Reviewed by the clinical team at Zest Regen Health · November 3, 2026 · 7 min read
Content managed by Phil Kim, Lucky Consulting Group
IV vitamin therapy has not been shown in randomized trials to prevent or shorten colds or flu in otherwise healthy people. The modest evidence that exists favors regular oral vitamin C, which may slightly shorten colds and reduce their severity, while no placebo-controlled studies support IV vitamin drips for this purpose. At Zest Regen Health in Columbia, Maryland, IV therapy is offered after a medical evaluation and is not positioned as a substitute for standard prevention such as the flu vaccine.
What IV vitamin therapy is
IV therapy delivers fluids, vitamins, and other nutrients directly into the bloodstream through an intravenous line. Because it bypasses the digestive tract, it can raise blood levels of a nutrient quickly, which is why hospitals use it for specific medical needs such as dehydration or nutrient deficiency. In wellness clinics, IV drips are often marketed for energy, immune support, or recovery, and those uses carry a different evidence standard.
What the evidence shows about vitamin C and colds
The most comprehensive review is the Cochrane review of vitamin C for preventing and treating the common cold, covering 29 trials and more than 11,000 participants. Regular oral vitamin C did not prevent colds in the general population, but it modestly shortened them, by about 8 percent in adults and 14 percent in children, and a 2023 meta-analysis found it reduced cold severity by about 15 percent. Starting vitamin C only after symptoms begin showed no consistent benefit.
The picture for IV vitamin C is different. There are no randomized trials of IV vitamin C for preventing or shortening colds or flu in healthy people. The large randomized trials of IV vitamin C in hospitalized COVID-19 patients, published in JAMA in 2023, found a very low probability of benefit and were stopped early for futility. Those results are in critically ill patients, not healthy people, but they illustrate that IV vitamin C is not a proven immune booster.
What about IV hydration and immune drips?
For IV hydration and so-called immune drips in otherwise healthy people, there is no placebo-controlled evidence that they prevent or shorten colds or flu. The American College of Clinical Pharmacology issued a position paper in 2024 noting there is little evidence these infusions provide benefit, and standard common-cold guidance from the American Academy of Family Physicians does not include IV therapy. Fluids, rest, and normal nutrition remain the evidence-supported basics.
What actually helps during cold and flu season
- Getting an annual flu vaccine, which is the single most effective prevention step
- Regular handwashing and avoiding touching your face
- Adequate sleep, which supports immune function
- Regular oral vitamin C if you want it, understanding it may modestly shorten colds but does not prevent them
- Staying hydrated with water and other fluids, which does not require an IV for most people
When IV therapy may still be appropriate
IV therapy can still be appropriate in specific situations after a medical evaluation, such as documented nutrient deficiency, dehydration, or recovery needs identified by a clinician. The question is whether a drip is medically indicated for you, not whether it is a general immune shortcut. That evaluation is exactly what happens at Zest Regen Health: our clinical team reviews your history, symptoms, and relevant labs before recommending IV therapy or any other treatment.
Why patients in Columbia, Maryland consider IV therapy at Zest Regen Health
Zest Regen Health is a physician-guided wellness and regenerative medicine clinic at 8860 Columbia 100 Parkway, Suite 216, Columbia, MD 21045, serving patients across Howard County and the surrounding area. IV therapy is one of several options offered after evaluation, alongside NAD+ therapy, hormone optimization, and medical weight loss. The clinic's physician, Dr. Francisco Ward, evaluates patients before any treatment plan is recommended.
Frequently asked questions
| Question | Short answer |
|---|---|
| Can an IV drip prevent a cold? | No randomized trial shows IV vitamin therapy prevents colds in healthy people. |
| Does oral vitamin C help? | Regular use may modestly shorten colds and reduce severity; starting it after symptoms begin shows no consistent benefit. |
| Is IV vitamin C safe? | IV infusions carry risks including infection and infusion reactions; medical evaluation and trained staff matter. |
| Who should decide whether IV therapy is right for me? | A clinician, after reviewing your history, symptoms, and labs. |
| Does Zest Regen Health offer IV therapy? | Yes, at the Columbia, Maryland clinic, after a medical evaluation. |
The bottom line
IV vitamin therapy is not a proven way to prevent or shorten colds and flu, and it should not replace the flu vaccine, sleep, and basic hygiene. If you are considering IV therapy for hydration, recovery, or nutrient support, the responsible first step is a medical evaluation to determine whether it is appropriate for you.
See how IV therapy is evaluated at Zest Regen Health
Meet Dr. Francisco Ward, the clinic's physician
Sources & further reading
- Cochrane: Vitamin C for preventing and treating the common cold (CD000980)
- Vitamin C reduces the severity of common colds: a meta-analysis (BMC Public Health, 2023)
- Intravenous Vitamin C for Patients Hospitalized With COVID-19: Two Harmonized Randomized Clinical Trials (JAMA, 2023)
- ACCP Position Paper on Hydration and Vitamin Infusion Clinics (J Clin Pharmacol, 2024)
- AAFP: Treatment of the Common Cold (Am Fam Physician, 2019)
Talk with our care team about this topic
A member of our clinical team can answer your questions at the Columbia, Maryland clinic. If IV Therapy may be appropriate for you, the first step is a consultation.
Care at Zest Regen Health is physician-guided. Meet our physicians, who evaluate patients at the Columbia, Maryland clinic.