I was wondering too. But I tried. It depends on the kind of the herbs. I drank fennel seed tea, peppermint also. Fennel seed expand the ducts. I drank it hot in the morning. The important thing is to not consume any oils. I drink strong herbs 4 - 5 days prior to the flush(dandelion root, chicory, Wormwood , gentian and other BITTER herbs. I drink only non - irritating herbs at the day of the flush( fennel seed, peppermint, chamomile ). Bitter herbs irritate the stomach so you have to eat in 30 minutes maximum but at the flush day your meals are restricted. Try some herbs. Every person has different tolerance to the different kind of herbs. you will learn with experience. Good luck.