VITAMIN C
 
   

Vitamin C

This section is compiled by Frank M. Painter, D.C.
Send all comments or additions to:   Frankp@chiro.org

If there are terms in these articles you don't understand, you can get a definition from the Merriam Webster Medical Dictionary. If you want information about a specific disease, you can access the Merck Manual. You can also search Pub Med for more abstracts on this, or any other health topic.

Jump to:    Vitamin C Articles          Vitamin C Abstracts


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Bioflavonoids Co–Q10 Gamma-Linolenic Ginkgo


Glucosamine Magnesium Omega-3 Acids Selenium


Soy Protein Vitamin B Antibiotic Abuse Iatrogenic Injury


Conditions That Respond Well Alternative Medicine Approaches to Disease
 
   

Vitamin C is one of several antioxidants shown to play a key role in the prevention of many types of cancers. Vitamin C maintains collagen, a protein necessary for the formation of skin, ligaments and bones. It also enhances the immune system, helps heal wounds and mend fractures, and aids in resisting some types of bacterial and viral infections.

 
   

Vitamin C Articles
 
   

Vitamin C, Reflex Sympathetic Dystrophy
and Complex Regional Pain Syndrome

G. Douglas Andersen, DC, DACBSP, CCN reports on 2 surgical trials that reduced the incidence of Reflex Sympathetic Dystrophy (aka Complex Regional Pain Syndrome) by 80%, by supplementing the post-surgical patients for 2 months with low-dose vitamin C.


A Nutritional Approach to Immunity
Many studies show that immune function depends on nutrients found primarily in whole, unprocessed foods. [2] Researchers have also confirmed that physical activity and a healthy emotional state are essential for proper immune function. [3, 4] A healthy diet and lifestyle may be the cornerstones of a strong immune system, but what specific measures can be taken when a person is faced with an immune challenge such as the annual cold and flu season?


Breathe Easy with Vitamin C
An investigation of lung health in rural China goes one step further than previous studies and finds that even smokers can benefit from vitamin C. Hu Guizhou, Ph.D., of Cornell University in Ithaca, New York, and Xin Zhang of the Chinese Academy of Preventive Medicine in Beijing compared the lung capacity of 3,085 people in 69 rural Chinese counties with their vitamin C intake. Vitamin C intake ranged from as much as 295 mg/day to as little as 42 mg/day. People with more vitamin C in their diet had greater lung volume—meaning they could exhale more air than those eating less of the vitamin. In fact, for each 100 mg/day increase of vitamin C, lung volume increased 22 mL. This study, completely controlled for smoking, determined the increase was the same in smokers and nonsmokers alike.


French Court Lifts Vitamin C Restrictions
After ten years of appeals and counter-appeals, a court in the central French province of Maine-et-Loire has ruled that vitamin C should not be considered a drug even in doses many times above the existing safety limit.


Media Overlooks Human Studies on Vitamin C
A Response to the Inaccurate Science Article which claimed Vitamin C could cause DNA Damage ~ Researchers at the University of Pennsylvania Center for Cancer Pharmacology and the news media overlooked five current human studies that disprove the notion that high-dose vitamin C causes DNA damage. Instead, the media exploited one test-tube study, published in the June 15, 2001 issue of Science, whose researchers concluded that the daily equivalent of 200 mg vitamin C could potentially cause cancer.


Vitamin C Lengthens Lifespan
Although vitamin C has long been considered the premier antioxidant, studies linking the vitamin to increased survival rates have been inconclusive. However, a major study conducted by researchers at Cambridge University School of Clinical Medicine in the U.K. and published in Lancet offers evidence that vitamin C saves lives.


The ANTIOXIDANTS Page
Review many other articles discussing the impact of antioxidants on health.

 
   

Vitamin C Abstracts
 
   

Effects of Multinutrient Supplementation on Antioxidant Defense Systems in Healthy Human Beings
J Nutr Biochem 2001 (Jul);   12 (7):   388–395

Oxidative damage involved in the pathogenesis of many diseases, such as cardiovascular disease, cancer and diabetics. The antioxidant defense system plays an important role in protecting body from oxidative damage. Numerous studies have been shown that a single vitamin or mineral supplementation has the beneficial effect on the antioxidant defense system. However, the overall combined effect of multinutrient supplementation on antioxidant defense system remains to be clarified. In the present double blind, placebo-controlled study, the antioxidative defense system was measured in 34 healthy subjects before and after multinutrient supplementation.


Successful and Sustained Treatment of Chronic Radiation Proctitis with Antioxidant Vitamins E and C
Am J Gastroenterol 2001 (Apr);   96 (4):   1080–1084

Chronic radiation proctitis, a common sequelae of pelvic radiation, is characterized by obliteration of the submucosal vasculature with subsequent ischemia and reperfusion injury. Oxidative stress is thought to be a major mechanism in radiation proctitis. Therefore, antioxidants (vitamins E and C) may be beneficial.


Vitamin C Augments Chemotherapeutic Response of Cervical Carcinoma HeLa Cells by Stabilizing P53
Biochem Biophys Res Commun 2001 (Mar 30);   282 (2):   409–15

Human Papilloma Virus (HPV) is associated in most instances with cervical cancer. Vitamin C has been shown to interfere with HPV's ability to disrupt normal cell regulation.


Salubrious Effect of Vitamin C and Vitamin E on Tamoxifen-treated Women in Breast Cancer With Reference to Plasma Lipid and Lipoprotein Levels
Cancer Lett 2000 (Apr 3);   151 (1):   1–5

Tamoxifen, a non-steroidal antiestrogen, has been used in the hormonal treatment for breast cancer. The hepatic estrogenic effect of tamoxifen causes severe triglyceridemia. Co-administration of Vitamin C and Vitamin E in trials reduced the tamoxifen-induced hypertriglyceridemia.


Apoptosis-inducing Activity of Vitamin C and Vitamin K
Cell Mol Biol 2000 (Feb);   46 (1):   129–143

Vitamin C shows both reducing and oxidizing activities, depending on the environment in which this vitamin is present. Higher concentrations of vitamin C induce apoptotic cell death in various tumor cell lines including oral squamous cell carcinoma and salivary gland tumor cell lines, possibly via its prooxidant action.


Vitamin Nutrition and Gastroesophageal Cancer
J Nutr 2000 (Feb);   130 (2S Suppl):   338S–339S

In a study on 29,584 subjects, combination of Vitamin E, Beta-carotene and Selenium significantly decreased mortality rate from stomach cancer, primarily due to the decrease in deaths resulting from adenocarcinomas of the gastric cardia.


Effect of Antioxidants on the Occurrence of Pre-Eclampsia in Women at Increased Risk: a Randomized Trial
Lancet 1999 (Sep 4);   354 (9181):   810–816

Supplementation with vitamins C and E may be beneficial in the prevention of pre-eclampsia in women at increased risk of the disease.


Ascorbic Acid in the Prevention and Treatment of Cancer
Alternative Medicine Review 1998 (Jun);   3 (3):   174–186 ~ FULL TEXT

Proposed mechanisms of action for ascorbic acid (ascorbate, vitamin C) in the prevention and treatment of cancer include enhancement of the immune system, stimulation of collagen formation necessary for "walling off" tumors, inhibition of hyaluronidase which keeps the ground substance around the tumor intact and prevents metastasis, prevention of oncogenic viruses, correction of an ascorbate deficiency often seen in cancer patients, expedition of wound healing after cancer surgery, enhancement of the effect of certain chemotherapy drugs, reduction of the toxicity of other chemotherapeutic agents such as Adriamycin, prevention of free radical damage, and neutralization of carcinogenic substances.


The Pro-oxidant and Antioxidant Effects of Vitamin C
Alternative Medicine Review 1998 (Jun);   3 (3):   170–173 ~ FULL TEXT

The paper entitled, "Vitamin C Exhibits Pro-oxidant Properties," which appeared recently in the journal Nature has attracted considerable attention. Authors Podmore, Griffiths, Herbert, et al describe the potential pro-oxidant effects of daily supplementation with 500 mg of vitamin C on DNA base oxidation in vivo. [1] Their conclusion raises concern because a vast number of individuals regularly supplement their diets with vitamin C in the belief that it has antioxidant effects.


Vitamin C and Chiropractic
J Manip Physiol Ther 1985 (Jun);   8 (2):   95–103

A review of the literature relating to possible clinical implications of ascorbic acid (AA) supplementation was conducted. Factors requiring a higher AA intake include smoking, alcohol ingestion, stress, diabetes mellitus, pregnancy, and certain drugs, including oral contraceptives, some antibiotics, acetylsalicylate and anti-inflammatory medications. AA has been found to significantly increase wound healing, reduce the inflammatory response, lessen respiratory distress, enhance immune function and serve to benefit many common conditions including osteoarthritis. It is concluded that vitamin C supplementation could be utilized for many conditions seen by chiropractors.

Thanks to  
Pub Med
for their quality MEDLINE search tool.


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