(Evangelyn Rodriguez) An independent lab that tests the quality of medications and health products recently found that many sunscreens sold on the market are contaminated with a cancer-causing chemical called benzene. After testing almost 300 unique batches of commercial sunscreens, Valisure discovered that 27 percent contained detectable levels of the toxic chemical while five percent contained levels that exceeded the limit recommended by the Food and Drug Administration (FDA). This has led the online pharmacy to file a petition for these products to be removed from market shelves.