Saw Palmetto is like everything else in this area, works for some an not for others I feel. How much does seem to be relevant, although I think some manufacturers put more in just to be "better", without actually seeing if it works better, could purity and source be more important?
REF: Natural and therefore no side effects.
I hate in when people use "natural" to mean harmless, its just not true, look at the 1000s of poisonous plants and fungi, they're natural too! Look in all "treatments" for test results and evidence, it's the way forward.
A treatment can in theory do the same thing without the same side effects guys, side effects are a separate issue from efficacy, as they can come from many complex reactions between your body and the chemical aside from the one intended by the manufacturer. A good example being Aspirin and Paracetamol, both inhibit the same enzyme involved with pain sensitivity, and yet one screws your liver, the other gives you stomach ulcers, admittedly neither is pleasant, but what I mean is that sides are irrelevant to effect.