Both, technically. Monsanto was the company that created and first produced Roundup. Bayer acquired Monsanto in 2018 and merged it into the company. When Bayer bought Monsanto, the company’s legal troubles, including the Roundup litigation, were also acquired.
Exposure can occur by ingesting, inhalation, or direct skin contact. According to studies, it’s getting harder to avoid being exposed to Roundup. Up to 60% of the food we consume and 75% of our air and water have been found to have traces of glyphosate. Even non-Roundup-treated crops have become affected.
Even glyphosate alone poses a threat. In Roundup, where it is combined with other chemicals, it may pose a greater risk to human health.