Found this information at skepdic.com...
September 30, 2004. A new study published in the Lancet has found that vitamin supplements do no good in protecting against cancer or other diseases. In fact, the study has found that some supplements may even increase one's cancer risk.
January 15, 2001. The Institute of Medicine has issued the latest of four reports on recommended dietary allowances (RDA) of vitamins and minerals. The report is based on a four-year review of the scientific research into vitamins and minerals. The bottom line? "Nutritionists say a healthy daily diet, with at least five fruits and vegetables, can provide plenty of most vitamins." Nevertheless, 40% of Americans take supplements. Some need them. Some are probably being harmed by them. E.g. Vitamin A: "more than 3,000 micrograms daily can risk birth defects in pregnant women and liver damage for others." Vitamin E: more than 1,000 milligrams (1,500 international units) a day "could cause uncontrolled bleeding." Vitamin C: "more than 2,000 milligrams a day can cause diarrhea."
An article in the New York Times by Jane E. Brody reported the results of a 13-year study involving over 10,000 Americans which "found no evidence of increased longevity among vitamin and mineral supplement users in the United States." This is especially bad news, since most of the people who take vitamins are non-smokers who don't drink heavily and who eat more fruits and vegetable than the rest of us. (The study also found that supplements failed to help the longevity of smokers, heavy drinkers, and those with chronic diseases.)
Taking vitamin C supplements could speed up hardening of the arteries, according to a study of "573 outwardly healthy middle-aged men and women who work for an electric utility in Los Angeles." Those taking vitamin C supplements showed "accelerated thickening of the walls of the big arteries in their necks....the more they took, the faster the buildup," according to the (now defunct) Nando Times.
Theres plenty more...go here - http://skepdic.com/vitacon.html and scroll down.
September 30, 2004. A new study published in the Lancet has found that vitamin supplements do no good in protecting against cancer or other diseases. In fact, the study has found that some supplements may even increase one's cancer risk.
January 15, 2001. The Institute of Medicine has issued the latest of four reports on recommended dietary allowances (RDA) of vitamins and minerals. The report is based on a four-year review of the scientific research into vitamins and minerals. The bottom line? "Nutritionists say a healthy daily diet, with at least five fruits and vegetables, can provide plenty of most vitamins." Nevertheless, 40% of Americans take supplements. Some need them. Some are probably being harmed by them. E.g. Vitamin A: "more than 3,000 micrograms daily can risk birth defects in pregnant women and liver damage for others." Vitamin E: more than 1,000 milligrams (1,500 international units) a day "could cause uncontrolled bleeding." Vitamin C: "more than 2,000 milligrams a day can cause diarrhea."
An article in the New York Times by Jane E. Brody reported the results of a 13-year study involving over 10,000 Americans which "found no evidence of increased longevity among vitamin and mineral supplement users in the United States." This is especially bad news, since most of the people who take vitamins are non-smokers who don't drink heavily and who eat more fruits and vegetable than the rest of us. (The study also found that supplements failed to help the longevity of smokers, heavy drinkers, and those with chronic diseases.)
Taking vitamin C supplements could speed up hardening of the arteries, according to a study of "573 outwardly healthy middle-aged men and women who work for an electric utility in Los Angeles." Those taking vitamin C supplements showed "accelerated thickening of the walls of the big arteries in their necks....the more they took, the faster the buildup," according to the (now defunct) Nando Times.
Theres plenty more...go here - http://skepdic.com/vitacon.html and scroll down.
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Ditto.