Back To Archive

This article is copyright 2008 International Schizophrenia Foundation and may not be reprinted or otherwise used without ISF's written permission. If you are interested in using or reprinting this article, please contact ISF at or write to International Schizophrenia Foundation, 16 Florence Avenue, Toronto, Ontario, Canada M2N 1E9. Fax (416) 733-2352.

Orthomolecular Medicine News Service, October 31, 2008

Vitamin C Slows Cancer Down
And, Doctors Say, Can Reverse It as Well

by Andrew W. Saul

(OMNS, October 31, 2008) The BBC recently reported (1) that "Vitamin C 'slows cancer growth.' An injection of a high dose of vitamin C may be able to hold back the advance of cancers, US scientists claim. The vitamin may start a destructive chain reaction within the cancer cell." The injection "halved the size" of tumors, and was reported in the Proceedings of the National Academy of Sciences.

The study authors themselves said that daily, high-dose vitamin C treatment "significantly decreased growth rates" of ovarian, pancreatic, and malignant brain tumors in mice. Such high, cancer-stopping levels of vitamin C can be "readily achieved in humans given ascorbate intravenously." (2)

"Readily achieved"? Then this is important, absolutely vital news for millions fighting or fearing cancer.

So what do major cancer organizations have to say? Not much. That is disappointing, but hardly surprising. Both the American Cancer Society and Cancer Research UK have downplayed or flatly ignored decades of physician reports and controlled clinical studies indicating that vitamin C stops cancer. What's worse, each of these supposedly comprehensive cancer research and education organizations continues to actively discourage people from using vitamin C against cancer.

Look for yourself and see. The American Cancer Society's vitamin C webpage (3) specifically states: "Although high does of vitamin C have been suggested as a cancer treatment, the available evidence from clinical trials has not shown any benefit." And Cancer Research UK states that "There is currently no evidence from clinical trials in humans that injecting or consuming vitamin C is an effective way to treat cancer." (1)

"No benefit," they say. "No evidence," they say.

Both organizations are wrong. Neither statement is true.

In 2008, Korean doctors reported that intravenous vitamin C "plays a crucial role in the suppression of proliferation of several types of cancer," notably melanoma. (4)

In 2006, Canadian doctors reported on the effectiveness of intravenous vitamin C in treating cancer. (5)

In 2004, doctors in America and Puerto Rico published clinical cases of vitamin C successes against cancer. (6)

In 1990, American doctors published their results successfully using vitamin C to treat kidney cancer (7). In 1995 and 1996, other cancers. (8) Using 30,000 mg of intravenous vitamin C twice per week, they found that "metastatic lesions in the lung and liver of a man with a primary renal cell carcinoma disappeared in a matter of weeks. . . We subsequently reported a case of resolution of bone metastases in a patient with primary breast cancer [1A] using infusions of 100 grams, once or twice per week." (9)

In 1982, Japanese doctors showed that vitamin C greatly prolonged the lives of terminal cancer patients. (10)

And as early as 1976, over two decades ago, physicians in Scotland showed that intravenous vitamin C improved quality and length of life in terminal cancer patients. (11)

Why are ACS and Cancer Research UK oblivious to the weight of evidence? All these previous clinical reports were published in peer-reviewed medical journals. One may bear in mind that both ACS and Cancer UK made their restrictive statements August 2008. Yes, 2008. In spite of increasingly compelling evidence for 22 years, both the American Cancer Society and Cancer Research UK are dragging their feet. Foot-dragging costs lives. Hundreds of thousands of people have died from cancer that could have been helped with ascorbate therapy. But for decades, their three advocated cancer treatments have been "cut, zap, and drug": surgery, radiation and chemotherapy. The use of high doses of vitamins has been thoroughly excluded.

Indeed, ACS still says: "If a supplement is taken, the best choice for most people is a balanced multivitamin/mineral supplement that contains no more than 100% of the 'Daily Value' of most nutrients." (3) That is harmful advice. Many well designed clinical studies show that large doses of vitamin C and other nutrients improve both quality and length of life for cancer patients. The key is the use of sufficiently high quantities, appropriately administered. More orange juice just won't do it.

Cancer Research UK even maintains (1) that vitamin C "can make cancer treatment less effective, reducing the benefits of radiotherapy and chemotherapy." That statement is untrue. (12,13) Oncologists routinely administer antioxidant drugs along with chemotherapy with no diminution of effect. (14)

ACS and Cancer Research UK say that there is "no evidence from clinical trials" that vitamin C is any good against cancer. They should start reading the medical literature. They are way behind the times. And they are wrong. Dead wrong.


(1) BBC NEWS: Published: Aug 4, 2008.

(2) Chen Q, Espey MG, Sun AY, Pooput C, Kirk KL, Krishna MC, Khosh DB, Drisko J, Levine M. Pharmacologic doses of ascorbate act as a prooxidant and decrease growth of aggressive tumor xenografts in mice. Proc Natl Acad Sci U S A. 2008 Aug 4.

(3) (accessed Aug 12, 2008)

(4) Padayatty et al. Intravenously administered vitamin C as cancer therapy: three cases. Canadian Medical Association Journal, 2006. 174(7), March 28, p 937-942.

(5) Lee SK, Kang JS, Jung da J et al. Vitamin C suppresses proliferation of the human melanoma cell SK-MEL-2 through the inhibition of cyclooxygenase-2 (COX-2) expression and the modulation of insulin-like growth factor II (IGF-II) production. J Cell Physiol. 2008 Jul;216(1):180-8.

(6) Riordan HD, Riordan NH, Jackson JA, Casciari, J.J., Hunninghake, R, Gonzalez MJ, Mora, E.M., Miranda-Massari, J.R., Rosario, N., Rivera, A.: Intravenous Vitamin C as a Chemotherapy Agent: a Report on Clinical Cases. Puerto Rico Health Sciences J, June 2004, 23(2): 115-118.

(7) Riordan HD, Jackson JA, 'Schultz M. Case study: high-dose intravenous vitamin C in the treatment of a patient with adenocarcinoma of the kidney. J Ortho Med 1990; 5: 5-7.

(8) Riordan N, Jackson JA, Riordan HD. Intravenous vitamin C in a terminal cancer patient. J Ortho Med 1996; 11: 80-82. Also: Riordan, N. H., et al. (1995) Intravenous ascorbate as a tumor cytotoxic chemotherapeutic agent. Medical Hypotheses, 44(3). p 207-213, March.

(9) Riordan NH, Riordan HD, Hunninghake RE. Intravenous ascorbate as a chemotherapeutic and biologic response modifying agent. and . Additional papers may be read at .

(10) Murata A, Morishige F and Yamaguchi H. (1982) Prolongation of survival times of terminal cancer patients by administration of large doses of ascorbate. International Journal of Vitamin and Nutrition Research Suppl., 23, 1982, p. 103-113. Also in Hanck, A., ed. (1982) Vitamin C: New Clinical Applications. Bern: Huber, 103-113).

(11) Cameron E and Pauling L. (1976) Supplemental ascorbate in the supportive treatment of cancer: prolongation of survival times in terminal human cancer. Proceedings of the National Academy of Sciences USA. 73:3685-3689. Also: Cameron E and Pauling L. (1978) Supplemental ascorbate in the supportive treatment of cancer: Reevaluation of prolongation of survival times in terminal human cancer. Proceedings of the National Academy of Sciences USA. 75:4538-4542. And: Cameron E and Pauling L. (1981) Survival times of terminal lung cancer patients treated with ascorbate. J. Intern. Acad. Prev. Med. 6: 21-27.

(12) Hoffer A. High doses of antioxidants including vitamin C do not decrease the efficacy of chemotherapy. Townsend Letter for Doctors and Patients.

(13) Chemotherapy Doesn't Work, So Blame Vitamin C. Orthomolecular Medicine News Service, October 7, 2008.

(14) Moss RW. Antioxidants against Cancer. Equinox Press Inc. Brooklyn NY, 2000. ISBN-10: 1881025284; ISBN-13: 978-1881025283. Also: Moss RW. Questioning Chemotherapy. Equinox Press, Brooklyn NY, 1995. ISBN-10: 188102525X; ISBN-13: 978-1881025252.

For more information:

Intravenous vitamin C protocols for cancer treatment are posted at:

Cameron E and Pauling L. Cancer and Vitamin C, revised edition. Philadelphia: Camino Books, 1993. ISBN-10: 094015921X; ISBN-13: 978-0940159211

Hoffer A and Pauling L. Vitamin C and Cancer: Discovery, Recovery, Controversy. Quarry Press, Kingston, ON, 1999. ISBN 1-55082-078-8 Reviewed at

Riordan HD, Hunninghake, R.E., Riordan NH, Jackson, J.J., Meng, X.L., Taylor, P., Casciari, J.J., Gonzalez MJ, Miranda-Massari, J.R., Mora, E.M., Norberto, R, Rivera, A. Intravenous Ascorbic Acid: Protocol for its Application and Use. Puerto Rico Health Sciences Journal, September 2003, 22:3.

Nutritional Medicine is Orthomolecular Medicine

Orthomolecular medicine uses safe, effective nutritional therapy to fight illness. For more information:

The peer-reviewed Orthomolecular Medicine News Service is a non-profit and non-commercial informational resource.

Editorial Review Board:

Damien Downing, M.D.
Harold D. Foster, Ph.D.
Steve Hickey, Ph.D.
Abram Hoffer, M.D., Ph.D.
James A. Jackson, PhD
Bo H. Jonsson, MD, Ph.D
Thomas Levy, M.D., J.D.
Erik Paterson, M.D.
Gert E. Shuitemaker, Ph.D.

Andrew W. Saul, Ph.D., Editor and contact person. Email:

To Subscribe at no charge:
Back To Archive

[Home] [History] [Library] [Nutrients] [Resources] [Contact] [Contribute]
Back To Molecule

This website is managed by Riordan Clinic
A Non-profit 501(c)(3) Medical, Research and Educational Organization
3100 North Hillside Avenue, Wichita, KS 67219 USA
Phone: 316-682-3100; Fax: 316-682-5054
© (Riordan Clinic) 2004 - 2024c

Information on is provided for educational purposes only. It is not intended as medical advice.
Consult your orthomolecular health care professional for individual guidance on specific health problems.