For decades, Monsanto's—now Bayer's—Roundup has been connected to cases of Non-Hodgkin's Lymphoma and other illnesses. Thousands of health diagnoses have been linked to Roundup, especially in recent years. This popular weed killer has a key ingredient in it called glyphosate, a toxic substance and "probable human carcinogen," according to the WHO and IARC. When combined with certain inert ingredients, glyphosate's toxicity is amplified. Such is the case with Roundup. As a result, it's quickly becoming one of the most toxic popular weed killers.