High Dose Vitamin C Therapy

Advanced IV infusion therapy to support immunity, metabolic health, and adjunctive cancer care. High-dose vitamin C offers powerful antioxidant, immune-modulating, and pro-metabolic benefits. At concentrations only achievable through IV infusion, Vitamin C can help reduce oxidative stress, support mitochondrial function, and complement integrative oncology treatment plans.

How Does It Work?

High-Dose Vitamin C therapy is the IV infusion of a pharmacological concentration of ascorbic acid directly into the bloodstream. Unlike oral Vitamin C, which is limited by gut absorption, IV Vitamin C achieves blood levels needed for cellular repair, immune enhancement, and—in specific contexts—anticancer effects.

Vitamin C acts as a potent antioxidant, supports collagen production, enhances immune defense, and reduces oxidative stress

In high doses, it may also behave as a pro-oxidant inside cancer cells, generating hydrogen peroxide that damages malignant tissues while leaving healthy cells unharmed.

The Benefits

Reduces oxidative stress — neutralizes free radicals and protects cellular DNA from oxidative damage
Enhances immune function — supports white blood cell activity, interferon production, and antibody synthesis
Boosts energy & mitochondrial function — IV vitamin C increases ATP production and supports cellular metabolism
Supports collagen synthesis & tissue repair
Adjunctive integrative oncology support — high-dose vitamin C may slow tumour growth, promote selective cancer-cell toxicity, and improve quality of life when used alongside standard care
May reduce chemotherapy side effects — research shows antioxidants can improve tolerance to conventional treatments without reducing efficacy
Improves detoxification pathways and may reduce inflammation, fatigue, and chronic stress burden

Conditions Can Help With

High oxidative stress
Immune dysfunction
Chronic fatigue
Viral or post-viral illness
Adjunctive support during cancer treatment
Tissue repair, wound healing, and collagen support
Detoxification and metabolic stress
General wellness, prevention, and anti-aging

High-dose Vitamin C has been studied for over 25 years as an integrative therapy, especially in oncology, metabolism, and immune resilience

What to Expect

Schedule & Share

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Diagnostic Testing

Rest and Recover

Book a consultation and upload any relevant medical history or diagnostic testing. Patients undergoing high-dose Vitamin C for oncology support are assessed carefully to ensure safe dosing.

Your physician or clinician will discuss your goals, review contraindications—such as kidney disease, kidney stone history, hemochromatosis, or G6PD deficiency—and determine the appropriate Vitamin C dose for your needs

Before high doses (generally above 25 g), a G6PD screening test may be required to prevent risk of hemolysis.

Patients are encouraged to drink 1L of water beforehand and eat 1–2 hours prior to treatment. Avoid alcohol the day before and day of infusion

During Treatment

Your infusion may last 60–120 minutes, depending on dose. Some people feel warmth, mild nausea, or lightheadedness during infusion. Rarely, headache, nausea, or burning at the site may occur, with vomiting or diarrhea being uncommon. After your infusion, hydration and rest are encouraged. Most patients report increased energy and mental clarity over the next 24–48 hours.

Why Choose Upper Room Clinic

With over a decade of experience in integrative and metabolic medicine, the Upper Room Clinic delivers high-dose Vitamin C with a careful, evidence-informed, patient-centred approach. Our team integrates oncology research, mitochondrial science, and clinical expertise to provide personalized dosing, safe protocols, and ongoing monitoring.

We tailor infusions to your unique biology—whether for immune support, anti-aging, recovery, or adjunctive cancer care—and ensure comfort, safety, and compassionate care in both our Toronto and Oakville locations.