PC SPES has been used by men with prostate cancer to arrest the progression of the disease and it may also help treat lymphoma, leukemia, breast cancer, and melanoma. PC SPES combines extracts of eight herbs: Scutellaria baicalensis, Glycyrrhiza glabra, Ganoderma lucidium, Isatis indigotica, Panax pseudo-ginseng, Serenoa repens, Dendrantherma morifolium, and Rabdosia rubescens. All of these are Chinese herbs except Serenoa repens, an extract of the American dwarf palm or saw palmetto. The combined mixture of herbs contains flavonoids that have antioxidant activity, anti-inflammatory and anti-carcinogenic actions and includes isoflavones that have some estrogen-like activity PC SPES also contains compounds that may enhance immune cell action and components that interfere with testosterone metabolism and prevent testosterone from binding to prostate cells. Acting together in the PC SPES mixture, individual components may team up to block prostate cancer progression, in part, by blocking androgen supported prostate cell growth and by causing cell death.