Most products have a few common low-level side effects and then rare to possible allergic responses.
Saw Palmetto reduces blood-clotting function. Be sure to inform your doctor that you have been taking saw palmetto before you schedule any surgery.
“Saw palmetto is LIKELY SAFE for most people. Side effects are usually mild. Some people have reported dizziness, headache, nausea, vomiting, constipation, and diarrhea. Some people have reported that saw palmetto causes impotence. But these side effects do not seem to occur any more often with saw palmetto than with a sugar pill.” – WebMD
Rare side effects bleeding nausea jaundice stomach pain tiredness bruising dark urine
Saw Palmetto affects hormones, so this should not be used by pregnant or breast feeding women.