Horny goat express liquid extract is made from epimedium grandiflorum, a powerful chinese tonic herb whose first recorded use dates back to the ancient text, shen non ben cao jing (ca. 200 b.c.-100 a.d.) were was it described as a warming herb that benefitted jing (semen or life essence). It has been traditionally used for kidney & adrenal support, for male endocrine function, erectile support and enhancement of libido in men and women.