Tea Tree Oil has natural antiseptic properties so it helps fight germs. When it is added to your homemade / natural cleaning products, it makes a strong, germ-fighting cleaner. It also is said to boost your immune system. When my kids were in the lower grades in school, I put it in their shampoo to help control lice. It has been used for lice prevention as far back as WWII, if not farther. Tea Tree Oil has many, many safe and healthy benefits.