A system, device, or method is provided which maintains a substantially physiological level or a substantially physiological cyclic pre-menopausal level of one or more steroid hormones in a mammalian subject in need thereof. The system, device, or method includes providing to the subject at least one treatment regimen including replacement therapy for the one or more steroid hormones or metabolites or modulators thereof, wherein the at least one treatment regimen is determined based on pre-menopausal cyclic steroid hormone levels of the subject and on current cyclic steroid hormone levels of the subject, wherein the at least one treatment regimen is configured to maintain the subject's one or more steroid hormones or metabolites or modulators thereof at substantially physiological cyclic pre-menopausal levels. The system, device, or methods can be used for the treatment of a disease or condition in the mammalian subject.