N-nitroso compounds formed from red meat consumption in humans are not shown to be tumorigenic like certain N-nitroso species studied in animal models.

“finally clinical evidence suggests that the type of end nitroso compounds found after the ingestion of red meat in humans consist mainly of nitro su iron and nitro so thiols products that have profoundly different chemistry's from certain and nitro species which have been shown to be tumorigenic through the formation of DNA addicts”