What is the FDA warning on kava?

Could you please explain to me what exactly the FDA warning regarding kava entails? I've heard some buzz about potential health concerns, but I'm not entirely sure what the specifics are. Could you elaborate on the nature of the warning and what potential risks are associated with the consumption of kava? Is it a widespread concern, or is it more specific to certain individuals or conditions? Additionally, are there any recommended dosages or safety measures that consumers should be aware of? I'd appreciate it if you could provide a clear and concise overview of the FDA's stance on kava. Thank you.