Bayer's marketing claimed the selenium in its product could reduce the risk of the disease.
In a statement, the CSPI said it contacted Bayer in June with proof that selenium does not have the desired effect on prostate cancer.
The World: Pittsburgh - Bayer sued after making prostate cancer claim
The Centre for Science in the Public Interest has filed a lawsuit against the multinational pharmaceutical company Bayer over ads claiming its multivitamin, One A Day Men's, could reduce prostate cancer.
