It doesn't take much to get GenAI spouting mistruths and untruths. The real problems start, though, when GenAI's hallucinations get harmful -- endorsing torture, reinforcing ethnic and racial stereotypes and writing persuasively about conspiracy theories. An increasing number of vendors, from incumbents like Nvidia and Salesforce to startups like CalypsoAI, offer products they claim can mitigate unwanted, toxic content from GenAI.