Is kava illegal in the USA?

Could you please clarify for me whether the consumption or possession of kava is considered illegal in the United States of America? I've heard conflicting opinions on this matter, and I'm trying to understand the legal standing of this plant-based beverage within the country's jurisdiction. Could you also explain any potential restrictions or regulations that might apply to its importation, sale, or use? I'm particularly interested in understanding whether it's permissible for individuals to consume kava in private settings, such as at home, and if there are any penalties associated with breaking any relevant laws. Thank you for your assistance in clarifying this matter for me.