Oral vitamin C is limited by gastrointestinal absorption — most people can absorb at most 500–1,000 mg in a sitting. IV administration bypasses this limit, allowing therapeutic doses (often 25–75 grams or higher under medical supervision) to circulate at concentrations that simply aren't achievable orally.
At these levels, vitamin C acts not just as an antioxidant but as a pro-oxidant in pathological cells, generating hydrogen peroxide that targets viruses, bacteria, and damaged cells while sparing healthy tissue.
We use Mega-C IV as part of integrative care plans for:


A typical Mega-C session runs 60–90 minutes. We start with a baseline G6PD test (a blood draw) before your first high-dose IV — this enzyme deficiency is the main contraindication for high-dose vitamin C. Once cleared, doses are scaled up gradually session-by-session based on your response.
The IV is delivered through a soft catheter in the arm; most patients read, work, or rest during the infusion. Side effects are uncommon at properly dosed protocols — mild thirst is the most common observation.
Most adults are candidates after baseline screening. Contraindications include G6PD deficiency, severe kidney impairment, iron-overload conditions (e.g., hemochromatosis), and active oxalate-stone disease. We screen at consultation.
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Mega-C is more than a high-dose vitamin C drip — it requires baseline screening, careful dose titration, and integration with the rest of your care. At Upper Room Clinic in Toronto:
Patients choose us because we combine evidence-based dosing with a deeply personalized approach to immune support.
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Contact Us
Locations
Upper Room Clinic – Oakville
Tel: 647-910-5359
Fax: 289-644-0255
oakville@upperroomclinic.com
Upper Room Clinic – Davisville
Tel: 647-521-8024
Fax: 647-348-8024
hello@upperroomclinic.com
Tuesday to Saturday
11am-6pm
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