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Intravenous vitamin C makes it possible to reach plasma concentrations 30 to 70 times higher than those achieved by the oral route, according to a pharmacokinetic study published in Annals of Internal Medicine (Padayatty et al., 2004). As immune support, its role is complementary and modest: the best available evidence shows that it slightly shortens the duration of colds, but it has not been proven to prevent them in the general population. In this article we explain what IV therapy can offer, what the science says, and what its honest limits are.
What is IV vitamin C therapy?
IV therapy is the administration of vitamins and minerals directly into the bloodstream through an intravenous line. By bypassing the digestive tract, it avoids the intestinal absorption limit: from around 200 mg per day taken orally, the transporters become saturated and the excess is eliminated (Levine et al., PNAS, 1996).
A vitamin drip session lasts between 30 and 60 minutes and takes place in a medical consultation room, with exact control of the dose and the infusion rate. At Santé, vitamin C is administered within combined formulas such as the Premium Drip or personalized drips, never as a standalone treatment.
What does the evidence say about vitamin C and immune defenses?
What we know about oral vitamin C
The largest Cochrane review to date (Hemilä and Chalker, 2013) analyzed 29 trials with 11,306 participants. Regular supplementation with at least 200 mg per day did not reduce the incidence of colds in the general population, although it did shorten their duration by 8% in adults and 14% in children.
In five trials involving people under extreme physical exertion —marathon runners, skiers and soldiers on sub-Arctic exercises— regular vitamin C supplementation halved the risk of catching a cold (Cochrane, 2013).
The European Food Safety Authority authorizes a single claim regarding immune defenses: "vitamin C contributes to the normal function of the immune system" (Regulation (EU) No 432/2012). No authorized claim refers to preventing or curing infections.
What the intravenous route adds
The intravenous route produces plasma peaks 30 to 70 times higher than the maximum achievable by the oral route (Padayatty et al., 2004). This pharmacokinetic difference is real, but the clinical evidence on outcomes —fewer infections or faster recovery— remains limited and heterogeneous.
With 200 mg per day taken orally, plasma saturates at around 70-80 µmol/L; an intravenous infusion can multiply that figure by tens for a few hours (Levine, 1996; Padayatty, 2004).
The honest conclusion: IV vitamin C therapy is a reasonable complement within a healthy lifestyle, not a shield. Results vary according to each person, their baseline nutritional status and their circumstances.
What can you expect from a session?
Every protocol begins with a medical assessment: medical history, current medication, possible contraindications and goals. If the person is suitable, the doctor defines the formula and the regimen; the session lasts between 30 and 60 minutes on a treatment table, with a small puncture in the arm.
- Medical assessment
- History and goals
- Suitable?
- Personalized protocol
- Alternatives or referral
- 30-60 min infusion
- Follow-up and adjustment
Most people resume their normal activity the same day. The result is not assessed immediately: the doctor reviews progress after the first sessions and adjusts the frequency according to the individual response.
When does it make sense and when does it not?
It makes sense as support during periods of greater strain —seasonal changes, frequent travel, intense workloads— or when the diet does not cover your needs. It does not replace vaccination, 7 to 9 hours of sleep or a balanced diet, and it is not a treatment for active infections.
The medical assessment rules out contraindications before the first session: kidney failure, G6PD deficiency, hemochromatosis or a history of oxalate kidney stones. For recurrent infections or persistent symptoms, consulting your GP or specialist is the appropriate step.
Oral versus intravenous
| Aspect | Oral vitamin C | Intravenous vitamin C |
|---|---|---|
| Absorption | Limited by intestinal transporters | Direct into the bloodstream |
| Plasma peak | Saturates from around 200 mg/day | 30-70 times higher than the oral maximum |
| Digestive discomfort | Possible at high doses | Not applicable |
| Dose control | Variable depending on diet and adherence | Precise, with medical supervision |
| Format | Daily, at home | 30-60 min session at the clinic |
IV therapy options at Santé
| Drip | Composition | Duration | Price |
|---|---|---|---|
| SANTÉ Premium Drip | Glutathione, vitamin C, B complex, biotin and magnesium | 30-60 min | €250/session |
| Fitness Drip | Carnitine, B complex, zinc, taurine, vitamin C and biotin | 30-60 min | €250/session |
| Custom Drip | Personalized formula after medical assessment | 30-60 min | Varies with personalization |
| NAD+ IV | NAD+ in doses of 250, 500 or 1,000 mg | 60-120 min | €500-1,000 |
Key points
- Intravenous vitamin C reaches plasma levels 30-70 times higher than the oral route (Padayatty, 2004).
- The evidence shows a modest effect: it shortens the duration of colds by 8-14%, with no proven prevention in the general population (Cochrane, 2013).
- EFSA only authorizes the claim that vitamin C "contributes to the normal function of the immune system" (Regulation (EU) No 432/2012).
- A session lasts 30-60 minutes and always begins with a medical assessment.
- Results vary: it is a complement, never a substitute for vaccines, sleep and a balanced diet.
How Santé Clinics approaches it
At Santé, every IV therapy begins with an individualized medical assessment; the IV therapy area is led by Dr. Alejandro Infante and all procedures are performed by licensed medical doctors. The protocol is personalized: the formula, dose and frequency are defined according to your history and your goals, and vitamin C is integrated into formulas such as the Premium Drip (€250 per session) or a tailored Custom Drip.
The aesthetic consultation is free of charge and the medical assessment prior to IV therapy costs €50, with a follow-up review at two weeks included. We see patients in Spanish, English, Portuguese and Russian at Avenida Diagonal 384, Barcelona.
Frequently asked questions
Does intravenous vitamin C prevent colds?
There is no solid evidence that it prevents colds in the general population; the available data point to a somewhat shorter duration of symptoms. Results vary between people and no serious protocol can promise immunity.
How many sessions do I need?
It depends on your starting point and your goal; the doctor defines it after the assessment. As a reference, NAD+ protocols recommend courses of 4 to 6 sessions for sustained results, and for vitamin drips the frequency is adjusted individually.
Does it have side effects?
The most common effects are mild discomfort at the puncture site or a sensation of cold in the arm during the infusion. The prior assessment rules out contraindications such as kidney failure or G6PD deficiency to minimize risks.
Can I combine it with other treatments?
Yes; IV therapy is often integrated into wellness plans alongside facial or body treatments, always with medical coordination. The team assesses compatibility with your medication and other procedures before scheduling.
How much does it cost?
The Premium Drip and the Fitness Drip cost €250 per session; the Custom Drip varies with personalization and NAD+ infusions range from €500 to €1,000 depending on the dose. The initial medical assessment costs €50.
