Our XXL Hair Oil has the ability to NATURALLY block DHT(Dihydrotestosterone) -which is an endogenous androgen sex steroid and hormone, and it is one of the leading causes of hair loss but, certain oils can block DHT such as Rosemary, Saw Palmetto, Stinging Nettle, Biotin, Castor Oil, and Tea Tree Oil, which help revitalize the hair follicles to promote hair growth.