It also has many dangerous side effects and is likely to increase the risk of cancer."[92] Red clover (Trifolium pratense) – a European species of clover, promoted as a treatment for a variety of health conditions, including cancers. According to the American Cancer Society, "available clinical evidence does not show that red clover is effective in treating or preventing cancer, menopausal symptoms, or any other medical conditions."[93] Saw palmetto (or Serenoa repens) – a type of palm tree found growing in the southeastern United States. Its extract has been promoted as a prostate cancer medicine; however, according to the American Cancer Society, "available scientific studies do not support claims that saw palmetto can prevent or treat prostate cancer in humans".[94] Seasilver – an expensive dietary supplement made mostly from plant extracts and promoted by two US companies.