Channel 2's Consumer Investigator Jim Strickland exposed health concerns about chemicals in the product months ago.

Bayer shares fall after US jury finds Roundup weed killer contributed to man’s cancer

»RELATED: Ingredient in popular weed killer raises cancer risk, study finds

Bayer AG shares dropped 13 percent to 60.66 euros ($68.84) in Frankfurt Wednesday. On Tuesday, a federal court jury in San Francisco ruled unanimously in a lawsuit against Monsanto. Attorneys say the trial, which will determine in a second phase whether the company is liable and if so, for how much, could help determine the fate of hundreds of similar lawsuits.

Monsanto says studies have established that Roundup's active ingredient, glyphosate, is safe. It has appealed a separate U.S. court decision last year in favor of a man who used Roundup.

A recent meta-analysis by researchers at the University of Washington found being “highly exposed” to glyphosate — found in common weed killers like Roundup — increases a person’s cancer risk by 41 percent.

“Our analysis focused on providing the best possible answer to the question of whether or not glyphosate is carcinogenic,” senior author Lianne Sheppard, a professor in the UW departments of Environmental & Occupational Health Sciences and Biostatistics, said in a press release. “As a result of this research, I am even more convinced that it is.”

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