Saw palmetto is an herbal remedy that comes from a type of palm tree. It’s been used in traditional medicine for centuries to relieve urinary symptoms, including those caused by an enlarged prostate. According to the National Institutes of Health (NIH), a few small-scale studies have suggested that saw palmetto might be effective for relieving BPH symptoms.
However, the NIH reports that when larger studies were conducted, they didn’t find saw palmetto any more effective than an inactive pill (placebo). Saw palmetto is safe, though, and it doesn’t cause any serious side effects.