After much controversy, the U.S. Environmental Protection Agency issued a report concluding that glyphosate is likely not carcinogenic to humans.

Glyphosate, the key ingredient in Monsanto’s Co.’s Roundup herbicide, is an important tool farmers depend on to fight weeds.

Glyphosate’s safety was challenged last year by the International Agency for Research on Cancer when they classified the herbicide as “probably carcinogenic to humans.”

The EPA is in the lengthy process of reviewing many agricultural chemicals and deciding whether farmers will be allowed to use them, according to a newsletter from the U.S. Farmers and Ranchers Alliance.

The EPA has been involved in a decades-long process to evaluate the human and animal health risks and ecological risks of glyphosate, according to Reuters.

An advisory group of scientists, known as the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA) Scientific Advisory Panel, will review the documents in October.

“Meeting materials are being shared with the public in advance of the FIFRA Scientific Advisory Panel who will use these materials for the meeting and their report,” the agency said to Reuters in an email statement.

The EPA published its report on glyphosate after reviewing the available data. The paper states, “The strongest support is for ‘not likely to be carcinogenic to humans’ at doses relevant to human health risk assessment.”

The EPA said it expects to publish its final assessment of glyphosate in the spring of 2017.

The European Food Safety Authority last November said glyphosate was “unlikely to pose a carcinogenic hazard to humans.”