Although saw palmetto extract has been claimed to be a herbal remedy for benign prostatic hyperplasia (BPH), it is an ineffective treatment,[1][3][4][5] and did not affect PSA levels, even when the extract was provided in high doses.[6] However, the Cochrane studies used different extracts. This suggests that the lack of an effect found in the most recent Cochrane review was due to the differences in the saw palmetto extracts used.