Let me tell you how amazing this shampoo is. I went to Honduras to work in an orphanage, and before we arrived, we heard there was a lice outbreak. I had heard tea tree keeps lice away, so I ran to the store before the trip and bought this shampoo. While in the orphanage, the 4 of us who used this shampoo never had one lice problem (even after holding kids in our arms, head to head), but the rest of the team who didn't use this shampoo ended up with lice. Not only did it work for that purpose, but tea tree shampoo is so revitalizing and rejuvenating to the scalp. I buy this every time I travel to a third-world country, and I have yet to get lice!