Why is kava hard on the liver?

Could you elaborate on the potential risks of Kava to the liver? I've heard some concerns regarding its effects, but I'm not entirely sure of the scientific basis. Could you explain in simple terms why Kava might pose a challenge for liver function? Is there any evidence from clinical studies that specifically points to its hepatotoxic effects? Additionally, are there any specific groups of individuals who should avoid consuming Kava due to higher risk factors? Thank you for clarifying these concerns.