 kmcolo says: An interesting article listing clinical trial and meta-study results of vitamin usage. It may be that not only are vitamin supplements not needed - they may hurt you. Clinical trials are useful and more convincing here. Always harder to interpret survey data.. which depends on what variables were studied and controlled for. It could have been that those with relatives who have cancer are more likely to take large quantities of Vitamin C & E, which could still leave them with higher rates of cancer. But the clinical trial suggest they don't help significantly (if some vitamins may not hurt significantly either..). Yes, as you note, these are clinical trials. Some on people, some on cells (cell trial outcomes are always fraught with not being applicable outcomes at the organism level.) Here are some interesting resutls: CONCLUSIONS: Long-term intake of a diet high in retinol (Vitamin-A) may promote the development of osteoporotic hip fractures in women. The amounts of retinol in fortified foods and vitamin supplements may need to be reassessed. CONCLUSIONS: The failure of vitamin C supplementation to reduce the incidence of colds in the normal population indicates that routine mega-dose prophylaxis is not rationally justified for community use. But evidence shows that it could be justified in pers... More: INTERPRETATION: We could not find evidence that antioxidant supplements can prevent gastrointestinal cancers; on the contrary, they seem to increase overall mortality. |
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