Saw Palmetto has been traditionally used for the relief of symptoms of an enlarged prostate. Side effects are rare (seen in fewer than 1 in every 1,000 men and if they occur, take the form of belching and stomach discomfort. It is also possible to be allergic to Saw Palmetto, in which case you are likely to get a skin rash on first using the product. There is no way of predicting allergies before taking a product. Allergy to Saw Palmetto is rare. Ensure that you swallow the capsule with food rather than chew it.