No, we do not recommend having herbal tea during 16 hours fast. During fasting hours, only ash-gourd juice, coconut water and detox (green) juices are allowed. Herbal tea can be taken in the evening as a substitute for regular tea initially. In the long run, we would want to remove dependence from herbal tea as well and switch to fresh juices. During a full day fast however, you can have herbal 1-2 times.