OT Black Cohosh warning / Breast cancer & Zinc /Prostate Cancer (cancer estrogen breast cancer prostate prostate cancer)
Nutrition Action Health Letter contains this warning.
"Black Cohosh, an herbal extract that many women take to treat menopausal
symptoms, may make breast cancer more likely to spread, says a new animal
study. In research funded by the Susan G Komen Foundation, mice given black
cohosh (at a dose comparable to 40 mg per day in women) were no more likely
to get breast tumors than mice given a placebo. HOWEVER, tumors were more
likely to metastasize to the lungs in the mice that were fed black cohosh.
A second study, in test tubes, suggests that Black Cohosh may increase the
side effects of chemotherapy (with Adriamycin and Taxotere).
Don't assume that supplements touted as alternatives to estrogen are safe or
effective. Since no one can be sure that they don't have an undetected
breast tumor, don't take black cohosh until more research is done."
Zinc/Prostate Cancer
"Sme supplement labels claim that Zinc is good forthe prostate. But in a
study that followed roughly 47,000 male health care professionals, those who
took at least 25milligrams of zinc a day-from a multivitamin or zinc
supplement-they had roughly twice the risk of advanced prostate cancer
compared to those who took less. Men who took at least 100 mg a day had
roughly three times the risk.
There was no connection between prostate cancer and how much zinc the men
were getting from their food.
What to do: It's too early to know if zinc promotes prostate cancer. To
play it safe, don't take zinc at levels higher than the Daily Value (15 mg).
Taking more than 40 mg- that's the upper tolerable intake level may lower
HDL (good cholestrol) and impair the immune system."
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