The answer is a strong YES.
Many herbal products have harmful effects. Because something is from nature, it does not mean, it is harmless. It could be dangerous. There are several 'native' medicines that have been proved so. You could see several cases in US from the use of native 'Chinese' medicines....
You have only one kidney
. Never take any product, that is not approved by your nephrologist
(kidney doctor) - even non-herbal ones like pain relievers...