Tigi s factor health factor daily shampoo is a gentle sulfate free shampoo for hair that has been damaged by heat chemicals or the environment a complex blend of nettle yucca white ginger horsetail and rosemary soothes the scalp and leaves hair looking fuller and stronger tigi is the hair care branch of renowned hairdressing business toni guy founded in london in 1963 by the mascolo brothers guiseppe toni and gaetano guy now owned by the american arm of toni guy the tigi r