Researchers have not evaluated rye grass pollen extract for long-term effectiveness, safety, or its ability to prevent complications of BPH.

Men who have problems urinating should see a doctor to rule out prostate cancer. Prostate cancer is treatable, but treatment may be more successful when you find and treat the cancer as early as possible.

The U.S. Food and Drug Administration (FDA) does not regulate dietary supplements in the same way it regulates medicines. A dietary supplement can be sold with limited or no research on how well it works.

When using dietary supplements, keep in mind the following:

• Like conventional medicines, dietary supplements may cause side effects, trigger allergic reactions, or interact with prescription and nonprescription medicines or other supplements you might be taking. A side effect or interaction with another medicine or supplement may make other health conditions worse.
• Dietary supplements may not be standardized in their manufacturing. This means that how well they work or any side effects they cause may differ among brands or even within different lots of the same brand. The form you buy in health food or grocery stores may not be the same as the form used in research.
• The long-term effects of most dietary supplements, other than vitamins and minerals, are not known. Many dietary supplements are not used long-term.

Talk with your doctor about any dietary supplement that you would like to try or are already using. Your doctor can help you manage your health better if he or she knows about all of your health practices.