Is kava legal in Australia?

Could you please clarify for me if the consumption and use of kava is permitted within the borders of Australia? I've heard conflicting information regarding its legality, and I'm keen to understand the official stance. Is it a controlled substance, or is it freely available for purchase and consumption? Additionally, are there any specific regulations or restrictions that one should be aware of when purchasing or using kava in Australia? Your clarification on this matter would be greatly appreciated.