How do you know if kava is strong?

How can one accurately determine the potency of kava? Is there a specific method or indicator that can be relied upon to gauge its strength? Perhaps there are certain factors to consider when assessing the quality and strength of kava, such as the origin of the plant, the preparation method, or even the appearance and aroma of the beverage. Understanding these factors may help individuals make informed decisions about their consumption of kava. Could you elaborate on these points and provide some guidance on how to accurately discern the strength of kava?