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Recent News and Articles on the Keywords: vitamin c + no benefits + vitamin  Related to the article below (Last Update: 7/8/2008)

Some Seek Guidelines to Reflect Vitamin D's Benefits
Washington Post, United States - Jul 3, 2008
Vitamin D can be toxic at high doses, and some studies suggest it could increase the risk for some health problems, experts say. No one knows what ...
Berry benefits
7DAYS, United Arab Emirates - Jul 6, 2008
Best eaten raw - as they contain a full day?s recommended supply of vitamin C per serving when raw - including a few strawberries with your morning cereal ...

Natural News.com
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Natural News.com, AZ - Jul 7, 2008
One of the most well known is probably scurvy -- a disease where your bones lose their rigidity due to a deficiency in vitamin C. The historical accounts of ...

eFluxMedia
Scientists: Watermelon Has Viagra-Like Benefits for ED, No Side ...
eFluxMedia - Jul 4, 2008
Apart from citrulline, watermelon also provides the body a wide range of useful compounds, such as vitamin C and vitamin A, vitamin B6 and vitamin B1, ...
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The Consumerist, NY - Jul 7, 2008
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CNN - Jul 2, 2008
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People assume that vitamins are harmless, even in high doses, because they are "natural". But swallowing a gram of vitamin C is the equivalent of consuming ...
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NutraIngredients-usa.com, France - Jul 2, 2008
The blend is not fortified with vitamin A or C to reach these levels." "Food labeling rules allow a company to cite the basic benefits of these nutrients, ...
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If that?s the case ? not to make light of the discomforts of diarrhea ? I know quite a few people who could benefit from a good healthy dose of vitamin C, ...
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New Straits Times, Malaysia - Jul 4, 2008
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Source: Google News

Effects of Hormone Replacement Therapy and Antioxidant Vitamin Supplements on Coronary … -
DD Waters, EL Alderman, J Hsia, BV Howard, FR Cobb … - JAMA, 2002 - Am Med Assoc
... and all but the smallest and shortest 20 reported no benefit. Although the antioxidant
effects of vitamins E and C may be synergistic, vitamin C was combined ...

Vitamin E and Donepezil for the Treatment of Mild Cognitive Impairment -
RC Petersen, RG Thomas, M Grundman, D Bennett, R … - New England Journal of Medicine, 2005 - content.nejm.org
... C. (2005). What's new in the other general journals. BMJ 330: 1411-1412 [Full Text];
Blacker, D. (2005). Mild Cognitive Impairment -- No Benefit from Vitamin E ...

Vitamin C for preventing and treating the common cold -
RM Douglas, H Hemil? - PLoS Med, 2005 - medicine.plosjournals.org
... No benefits have been observed from therapeutic use of ... mechanisms underlying the
observed prophylaxis benefits in those ... of large doses of vitamin C. Can Med ...

Relation of Consumption of Vitamin E, Vitamin C, and Carotenoids to Risk for Stroke among Men in the … -
A Ascherio, EB Rimm, MA Hernan, E Giovannucci, I … - Annals of Internal Medicine, 1999 - annals.highwire.org
... point of view to emphasize the preventive benefits of diets ... that use of vitamin E
or vitamin C supplements is ... risk for stroke in adult men with no history of ...

Vitamin E in the Primary Prevention of Cardiovascular Disease and Cancer The Women's Health Study: A … -
IM Lee, NR Cook, JM Gaziano, D Gordon, PM Ridker, … - JAMA, 2005 - Am Med Assoc
... vitamin E and found no benefits on CVD, 26 as did another secondary prevention trial
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Potential Antiatherogenic Mechanisms of Ascorbate (Vitamin C) and a-Tocopherol (Vitamin E) -
AC Carr, BZ Zhu, B Frei - Circulation Research, 2000 - Am Heart Assoc
... and HOPE trials, have found no benefits of vitamin E ... have to be coadministered with
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Serial coronary angiographic evidence that antioxidant vitamin intake reduces progression of … -
HN Hodis, WJ Mack, L LaBree, L Cashin-Hemphill, A … - JAMA, 1995 - Am Med Assoc
... No benefit was found for use of supplementary vitamin ... Vitamins C and E Prolong Time
to Arterial Thrombosis ... Heart Disease: Emphasis on Vitamin C, Vitamin E, and ...

Effects of Ramipril and Vitamin E on Atherosclerosis The Study to Evaluate Carotid Ultrasound … -
EM Lonn, S Yusuf, V Dzavik, CI Doris, Q Yi, S … - Circulation, 2001 - Am Heart Assoc
... Supplementation in Atherosclerosis Prevention (ASAP) study indicate no beneficial
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… Trials in Linxian, China: Supplementation With Specific Vitamin/Mineral Combinations, Cancer … -
WJ Blot, JY Li, PR Taylor, W Guo, S Dawsey, GQ … - jnci, 1993 - jnci.oxfordjournals.org
... No significant effects on mortality rates from all ... and zinc, riboflavin and niacin,
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[PDF] Lack of effect of long-term supplementation with beta carotene on the incidence of malignant … -
… Stampfer, B Rosner, NR Cook, C Belanger, F LaMotte … - New England Journal of Medicine, 1996 - sadr.biostat.wisc.edu
... 334 No. ... PPENDIX The members of the End Points Committee were S. Goldhaber, C. Kase,
M ... Effects of a combination of beta carotene and vitamin A on lung cancer and ...
-

Source: Google Scholar
 
 

Vitamin C appears to have no benefit on exercise

Taking vitamin C does not appear to help exercise performance despite public preconceptions, suggests a small US study.

 
Earlier research had showed that the vitamin reduced oxidative stress indicating a potential boost during exercise. But a team from the University of Colorado says that they found no improvements in real exercise capacity for young or old men and women, by either acute or long-term intake of ascorbic acid.

The physiologists gave vitamin C through an infusion to a group of 12 young adults, aged on average 23 years old, and 10 older (61 years old) adults just before exhaustive exercise on a treadmill. They also took a 500mg dose of the vitamin daily for one month prior to the tests.

The researchers predicted that "acute administration of ascorbic acid might improve/restore maximal aerobic capacity (MAC) and maximal cardiac output (MCO) in the sedentary older adults, thus creating the possibility that longer-term ascorbic acid supplementation could be used therapeutically to sustain the improvement".

But reporting in the 22 October online edition of the Journal of Applied Physiology (doi:10.1152/japplphysiol.00790.2004) the scientists write that "the age-associated decline in (MAC and MCO) is unaffected by acute or chronic administration (the supplements) of moderate daily ascorbic acid supplementation" for either men or women.

Lead researcher Christopher Bell said: <>"We did see a decrease in oxidative stress with large doses of vitamin C, but this decrease didn't improve aerobic abilities either for younger or older subjects."

The only major difference found throughout the experiment was that "irrespective of age, MAC, MCO and heart stroke volume were greater in men compared with women; however there were no sex-differences or age-sex interactions pertaining to the response of any of these variables to administration of ascorbic acid", said the researchers.

The study also showed that plasma concentration increased in all subjects following the acute but not chronic administration and that oxidative stress was reduced in both groups after acute administration.

Yet maximum stroke volume was similar in the older and young adults, and was unchanged after taking vitamin C.

According to Bell, the big difference in results came from the fact that in earlier studies some of the metabolic manifestations of exercise were chemically induced, while the current study actually tested the role of vitamin C in hard-exercising humans.

 
 
 
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