- Here is a list of all the international organizations that say glyphosate is not a carcinogen. Only the International Agency for Research on Cancer (IARC) concluded that glyphosate is a Group 2A carcinogen. They conclude that “it is probably carcinogenic to humans”. This puts it in the same category as red meat, hot beverages, and working as a barber. The evidence on carcinogenicity was less robust than for agents such as bacon, salted fish, oral contraceptives and wine.