Is kava federally illegal?

Hello there, I'm curious about the legal status of kava. I understand that it's a popular herbal supplement with relaxant effects, but I've heard some conflicting information regarding its legality at the federal level. Can you clarify whether KAVA is federally illegal in the United States? Are there any restrictions or regulations that consumers should be aware of when purchasing or consuming kava? Thank you for your assistance in clearing up any confusion.