What Is High Dose IV Vitamin C?

A Stage Four Cancer Survivor’s Experience and Research

My Journey to High Dose IV Vitamin C (HDIVC)

When my cancer went to stage four, I did what most people do. I followed the standard playbook. Surgery, radiation, chemotherapy, and immunotherapy. Those weren’t optional. They were the first line in a very serious war.

But at the same time, I started looking for ways to support my body, improve my quality of life, and maybe tilt the odds in my favor. That’s how I came to high dose intravenous vitamin C.

I had no idea what it was at first. When the pharmacist in Tennessee mentioned it during our consultation, I thought he meant taking vitamin C pills.

“No,” he said, shaking his head. “Not oral vitamin C. That won’t get you where you need to be. We’re talking about high dose IV vitamin C, putting it directly into your bloodstream at concentrations you could never reach by swallowing pills.”

“What’s the difference?” I asked.

“When you take vitamin C by mouth, your body only absorbs a small amount. Your digestive system limits how much gets into your bloodstream. But when we bypass your gut and put it directly into your veins at very high doses, it does something completely different. Inside the tumor environment, those high concentrations can generate hydrogen peroxide, which is toxic to cancer cells but leaves healthy cells mostly alone.”

That got my attention.

High Dose IV Vitamin C therapy, often called HDIVC, is an alternative or complementary cancer treatment that delivers vitamin C directly into the bloodstream in concentrations far greater than those achieved through oral supplementation. When taken orally, the gut’s absorption capacity limits vitamin C, and excess amounts are excreted. When administered intravenously, the vitamin bypasses the digestive system, resulting in blood levels that can be up to one hundred times higher.

I’m not a doctor, but here’s what I learned: High dose IV vitamin C means doses that are 10, 20, sometimes 50+ times higher than what you could ever achieve by eating oranges or taking pills. We’re talking about doses measured in grams, not milligrams.

The Numbers: Oral vs. IV

Oral vitamin C (swallowed):

Maximum absorption: approximately 200 to 400 mg
Blood concentration plateaus around 200 micromolar (µM) no matter how much you take
Acts as an antioxidant at these levels

High dose IV vitamin C (infused):

Typical cancer dose: 25 to 100 grams per infusion
Blood concentration can reach 10,000 to 30,000 µM (50 to 150 times higher than oral)
Acts as a pro-oxidant at these levels, generating hydrogen peroxide inside tumors

This is why the early vitamin C cancer trials in the 1970s and 1980s failed. They used oral vitamin C, which can’t reach the concentrations needed for anti-cancer effects. It wasn’t until researchers started using IV administration that results changed.

The Science: How HDIVC Damages Cancer Cells

At high doses, vitamin C switches its role. It goes from being an antioxidant to acting as a pro-oxidant. The way it works, at least from what my integrative oncologist explained, is that at very high blood levels, vitamin C creates oxidative stress that cancer cells struggle to handle, while normal cells have better defenses to protect themselves.

“Think of it like this,” my doctor said. “Cancer cells are already stressed. They’re growing fast, dividing constantly, and they’re metabolically unstable. High dose vitamin C pushes them over the edge. Your healthy cells can handle it. Cancer cells can’t.”

That made sense to me.

Many people ask about the benefits of high-dose vitamin C for advanced-stage cancer patients. When I started researching, I learned that high dose IV vitamin C kills cancer cells through several mechanisms:

1. Hydrogen Peroxide Generation

At high concentrations, vitamin C reacts with iron and other metals in the extracellular fluid around tumors, generating hydrogen peroxide (H₂O₂). Normal cells have high levels of catalase, an enzyme that quickly breaks down hydrogen peroxide into harmless water and oxygen. Cancer cells have much lower catalase activity. They can’t detoxify hydrogen peroxide as efficiently, so it accumulates inside the tumor and damages cancer cell DNA, proteins, and membranes.

This creates a therapeutic window: the hydrogen peroxide kills cancer cells while largely sparing healthy tissue. This selective cytotoxicity is what makes HDIVC so promising.

2. Preferential Uptake by Cancer Cells

Cancer cells overexpress glucose transporters (GLUT-1, GLUT-3) because they need massive amounts of glucose to fuel their rapid growth. Vitamin C has a similar molecular structure to glucose. Cancer cells mistake it for sugar and actively transport it inside the cell. Once inside, the vitamin C generates even more oxidative stress, attacking the cancer from within.

3. Disruption of Iron Metabolism

Cancer cells rely heavily on iron for DNA synthesis and cell division. They have altered iron metabolism with high labile (free) iron levels inside the cell. High dose vitamin C reacts with that free iron, generating toxic reactive oxygen species (ROS) that damage cancer cells.

4. Immune System Support

At pharmacologic doses, vitamin C also:

Enhances T-cell function
Supports natural killer (NK) cell activity
Reduces inflammation
May help chemotherapy and immunotherapy work better

This is why I took it alongside Keytruda. I wanted every possible advantage for my immune system.

Does HDIVC Enhance Chemotherapy and Radiation?

Yes, and that’s one of the most exciting aspects. High Dose IV Vitamin C has been shown to sensitize cancer cells to chemotherapy and radiation. A study from the University of Iowa reported that pancreatic cancer patients receiving HDIVC alongside chemotherapy lived twice as long as those who received chemotherapy alone, 16 months compared to 8.

The National Institutes of Health found similar synergy in glioblastoma patients, where HDIVC improved survival and reduced fatigue when used in combination with radiation and chemotherapy. Patients tolerated the treatment well, with no added toxicity.

Immunotherapy Combo: What About Keytruda?

The role of HDIVC in boosting immunotherapy is an emerging and exciting field. Preclinical studies suggest that high dose vitamin C can increase the infiltration of CD8+ T cells into tumors, potentially enhancing the effects of PD-1 inhibitors like Keytruda. While human trials are limited so far, early results suggest that HDIVC may strengthen the effectiveness of immunotherapies by improving the immune system’s ability to recognize and target cancer cells. Vitamin C could be more than just an add-on. It may become a critical piece of the treatment puzzle.

Why I Decided to Try HDIVC

After the Tennessee consultation, I started researching everything they’d recommended. Late at night, sitting at my kitchen table, I’d read studies and case reports about IV vitamin C in cancer patients.

The Pancreatic Cancer Trial That Changed My Mind

The study that really caught my attention was published in 2017 in Scientific Reports. Pancreatic cancer is one of the deadliest cancers out there, with median survival typically 6 to 8 months with standard chemotherapy. Most people don’t survive long.

In this phase I/IIa trial:

Patients with metastatic pancreatic cancer received standard chemotherapy (gemcitabine) plus high dose IV vitamin C (75 to 100 grams per infusion, 3 times per week)
Median overall survival: 16 months (vs. historical control of approximately 8 months with chemotherapy alone)
Disease control rate (stable disease or better): 83%
The treatment was well tolerated with minimal toxicity

They doubled survival time in one of the hardest to treat cancers.

I remember reading that and thinking: If it can do that for pancreatic cancer, what might it do for me?

Other Supporting Studies I Found

Phase I Safety Study (University of Kansas, 2008):

24 patients with advanced cancers
Doses escalated to 1.5 grams per kilogram (about 90 to 120 grams for an average adult)
No dose limiting toxicity
Peak plasma concentrations: 13 to 28 millimolar (far above what’s achievable orally)
Conclusion: High dose IV vitamin C is safe when administered properly

Ovarian Cancer Study (University of Iowa, 2014):

Patients receiving IV vitamin C plus chemotherapy had:

Fewer chemotherapy dose reductions
Fewer treatment delays
Less chemotherapy related toxicity
Trends toward improved outcomes

This told me IV vitamin C might actually help me tolerate chemotherapy better, and possibly make it more effective.

Laboratory Studies:

Multiple studies showed that high concentrations of vitamin C killed cancer cells in petri dishes and slowed tumor growth in mice
It worked against multiple cancer types: lung, colon, pancreatic, ovarian, glioblastoma, melanoma

More Clinical Support for HDIVC in Cancer Care

Beyond pancreatic and brain cancers, additional studies show HDIVC’s potential in a variety of cancers. A pilot trial on lung cancer patients reported a disease control rate of over 90 percent when HDIVC was included. A case study in liver cancer showed complete regression of lung metastases after ten months of 70 gram HDIVC treatments. Ovarian cancer patients tolerated high dose therapy up to 110 grams per square meter, with improved quality of life and minimal side effects. A 2021 review described HDIVC’s multitargeted power, from gene regulation to reducing metastasis.

Finding a Place That Would Do It

Not every clinic offers high dose IV vitamin C. Most oncology centers don’t, either because they’re not familiar with the research or because insurance doesn’t cover it.

I found a place called The DRIPBaR in Edina, Minnesota that specializes in IV therapies. They had experience working with cancer patients and understood the protocols.

When I walked in for my first consultation, they reviewed my medical records, talked to me about my goals, and explained the process.

“We’ll start with a test dose to make sure you tolerate it well,” they said. “Then we’ll gradually increase the dose over several sessions. Most cancer patients do infusions once or twice a week.”

My Protocol

Starting dose: 25 grams per infusion
Target dose: 75 grams per infusion
Frequency: Twice weekly for the first 12 weeks (June through September 2025)
Maintenance: Once weekly after initial intensive phase
Duration: About 60 to 90 minutes per infusion

The cost wasn’t cheap. Insurance didn’t cover it. Each infusion was $200 to $300, depending on dose. Over 12 weeks, that added up to nearly $5,000 to $6,000.

I’d already lost my income, sold my truck, and burned through savings. What was a few thousand dollars more if it might keep me alive?

Sarah’s mom helped pay for some of it. We scraped together the rest.

It was worth every penny.

What the Infusions Were Like

The first time I sat in that chair and they hooked up the IV, I didn’t know what to expect.

“This will take about an hour,” the nurse said. “You might feel a little flush or lightheaded as the dose goes up, but that’s normal. Let me know if you feel anything unusual.”

I sat there watching the clear liquid drip into my arm. It didn’t hurt. It didn’t make me nauseous like chemotherapy. It was almost peaceful.

What I felt during infusions:

Mild warmth spreading through my body
Slight lightheadedness (especially at higher doses)
Relaxation, almost meditative
Occasionally mild thirst

What I did NOT feel:

Nausea
Pain
Fatigue
Any of the brutal side effects I experienced with chemotherapy

After the first session, I didn’t feel dramatically different. But over time, weeks then months, I started noticing changes:

My energy improved. I wasn’t as exhausted all the time. My recovery from Keytruda seemed better. The side effects didn’t hit as hard. I felt more hopeful. Knowing I was doing something proactive, something that might be helping, gave me a psychological boost.

And then came the September 2025 scan. The one that showed my lung tumors were shrinking.

I can’t prove it was the IV vitamin C. I was also on Keytruda, doing the carnivore diet, taking supplements, getting sunlight. But I believe it was part of the equation. I believe it gave my body the extra support it needed to fight back.

The Timeline: When I Started and What Happened

June 12, 2025: Started high dose IV vitamin C at The DRIPBaR

Initial dose: 25 grams
Frequency: Twice weekly

June through July 2025: Dose escalation

Increased to 50 grams
Then to 75 grams (my target dose)
Continued twice weekly

September 8, 2025: First scan after starting protocol (3 months)

Lung nodules were shrinking
Right middle lobe: 7mm (down from 8mm)
First evidence that the protocol was working

December 2, 2025: Second scan (6 months)

Two nodules undetectable
Right middle lobe: 4mm (continued shrinking)
Right upper lobe: 2mm (barely visible)

I had received approximately 24 high dose IV vitamin C infusions (75 grams each) by the time of my December scan.

Total vitamin C administered: approximately 1,800 grams over 6 months.

For context, that’s the equivalent of eating 36,000 oranges, except the vitamin C went directly into my bloodstream at concentrations that could never be achieved through diet.

What the Research Actually Shows

I want to be honest with you about what the science says, because I’m not here to sell false hope.

What We Know

High dose IV vitamin C is generally safe when administered correctly in a medical setting with proper screening (especially for G6PD deficiency)
Early phase trials show it’s well tolerated alongside chemotherapy and may reduce treatment related side effects
The pancreatic cancer trial showed doubled survival time (8 months to 16 months) when added to standard chemotherapy
Laboratory studies show multiple potential anti-cancer mechanisms: hydrogen peroxide generation, preferential uptake by cancer cells, disruption of iron metabolism, immune support
Pharmacologic concentrations (greater than 10,000 µM) can only be achieved by IV administration, not oral supplementation
There are ongoing clinical trials testing IV vitamin C in combination with chemotherapy, radiation, and immunotherapy

What We Don’t Know

Large, randomized Phase III trials in most cancer types are still needed
It’s not FDA approved as a cancer treatment
We don’t know exactly which patients benefit most (though emerging data suggests patients with certain genetic profiles may respond better)
Optimal dosing and frequency haven’t been definitively established
It doesn’t work for everyone, some patients don’t respond

Important Safety Considerations

Who Should NOT Take High Dose IV Vitamin C:

1. People with G6PD Deficiency

This is a genetic enzyme deficiency affecting red blood cells
High dose vitamin C can cause severe hemolysis (red blood cell destruction) in people with G6PD deficiency
YOU MUST BE TESTED for G6PD deficiency before starting IV vitamin C
This is non-negotiable

2. People with Severe Kidney Disease

High doses can cause oxalate kidney stones in susceptible individuals
Kidney function should be monitored

3. People on Certain Medications

May interact with chemotherapy drugs (both positive and negative interactions)
Discuss with your oncologist

My Oncologist’s Perspective

My oncologist was cautiously supportive.

“I can’t officially recommend it,” he told me, “because we don’t have enough large scale trial data yet. But I’ve seen patients who seem to do better with it. The safety profile looks good. The mechanism makes sense. If you want to try it and you’re working with a qualified clinic, I won’t stop you.”

“There’s actually a clinical trial at the University of Iowa testing high dose IV vitamin C with chemotherapy for pancreatic cancer. You might qualify, but enrollment is limited and you’d have to travel. Since The DRIPBaR can provide the same treatment locally, and your cancer is progressing, I understand why you’d start now rather than waiting for trial enrollment.”

That was good enough for me.

What I Wish I’d Known Earlier

If I could go back and talk to myself when I was first diagnosed, here’s what I’d say:

1. IV Vitamin C Is Not a Replacement for Standard Treatment

You still need surgery, radiation, chemo, immunotherapy, whatever your oncologist recommends. This is in addition to, not instead of.

2. Not All Clinics Are Created Equal

Find a place with:

Experience treating cancer patients
Proper protocols and dosing
Medical supervision
Screening for G6PD deficiency before starting

3. It’s Not Covered by Insurance

Be prepared to pay out of pocket. For me, it cost approximately $5,000 to $6,000 for the first 12 weeks (24 infusions at 75 grams each). It was worth every penny.

4. It Takes Time

You won’t feel better after one infusion. This is a weeks to months commitment. The pancreatic cancer trial showed benefits at 3+ months of treatment.

5. Talk to Your Oncologist

Some doctors are open to it. Some aren’t. But you should have that conversation. Bring them the research. Show them the safety data. Ask their opinion.

Where I Stand Today

I’ve been doing high dose IV vitamin C since June 2025. I started with twice weekly infusions for 12 weeks, then reduced to once weekly maintenance.

My December 2025 scan showed:

Two of four lung tumors completely undetectable
The other two dramatically smaller

Did the IV vitamin C do that? I’ll never know for sure. But I believe it helped. I believe it gave my body tools it wouldn’t have had otherwise. I believe it supported my immune system while Keytruda attacked the cancer.

And I believe that when you’re fighting stage four cancer, you don’t leave anything on the table. You use every tool available, conventional, integrative, nutritional, spiritual, and you fight with everything you have.

It’s Not a Miracle Cure, But It Is a Powerful Ally

HDIVC is not a cure all. It is not a replacement for proven cancer treatments. But it has shown promise as a complementary strategy. For patients with advanced disease, limited options, or those who want to integrate holistic care, HDIVC offers real hope. It helps the body recover, fight, and endure treatment, and in some cases, may improve outcomes.

My Advice to You

If you’re considering high dose IV vitamin C, here’s what I recommend:

DO:

Do your research. Read the studies. Understand what it can and can’t do.
Get tested for G6PD deficiency BEFORE starting. This is critical for safety.
Find a qualified clinic. Look for places with medical oversight and experience treating cancer patients.
Talk to your oncologist. Get their input. Some will support it. Some won’t. But you deserve to have that conversation.
Expect it to take time. Commit to at least 8 to 12 weeks. Results don’t happen overnight.
Combine it with other evidence based treatments. This is an adjunct, not monotherapy.

DO NOT:

Use oral vitamin C and expect the same results. It won’t reach pharmacologic concentrations.
Skip G6PD testing. People have died from hemolysis after taking high dose IV vitamin C without knowing they had G6PD deficiency.
Expect miracles. This isn’t a magic bullet. It’s one tool in a bigger toolbox.
Do this without medical supervision. Find a qualified clinic with experience.
Abandon conventional treatment. IV vitamin C works WITH standard care, not instead of it.

The Bottom Line

High dose IV vitamin C didn’t cure me.

But I believe it helped me fight back.

I believe it:

Generated hydrogen peroxide that was toxic to my cancer cells
Supported my immune system alongside Keytruda
Reduced oxidative stress and inflammation
Gave my body extra tools to heal

And in a battle like this, every advantage matters.

Six months after starting:

Two tumors: undetectable
Two tumors: dramatically smaller
Body: healing
Hope: alive

If you want to read the studies I mentioned, I’ve included citations in the Research Appendix at the back of my book.

Bring them to your doctor. Have the conversation. Make an informed decision.

Because at the end of the day, this is your fight. And you deserve every weapon you can get.

Final Thoughts

High dose intravenous vitamin C represents a fascinating and potentially powerful addition to the cancer treatment landscape. By exploiting the vulnerability of cancer cells to oxidative stress and supporting the overall well being of patients, HDIVC offers hope to those facing difficult diagnoses. Ongoing research continues to explore its full potential, but for many, it already serves as a vital component of a broader, more personalized treatment plan.

Legal Disclaimer

The information shared in this post is based on my personal experience, independent research, and alternative health perspectives. It is not intended to diagnose, treat, cure, or prevent any disease and should not be considered medical advice. Always consult with a licensed medical professional or your healthcare provider before starting, stopping, or changing any treatment or supplement, especially with cancer or other severe conditions. Decisions about your health should be made in partnership with a qualified medical professional who understands your individual needs.

Wayne Schlicht

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