Evalon Cream 15 gm main function is to help develop and nurture female reproductive organs and urinary system. Estriol is the main active ingredient present in Evalon (15 gm) cream. Esrtriol belongs to a group of medicines called Hormone Replacement Therapy (HRT). It is a natural occurring Oestrogenone of the three types of Estrogen, which is also produced by the female human body.