Saw Palmetto does have some anti-androgenic activity in-vitro (in a test tube/petri dish), but it’s effects in-vivo (in the body) are suspect. It’s effects on the prostate are more likely due to the fact that it is a demostrated alpha-1 antagonist, similar to prazosin which has been used for BPH. Also, it’s alpha-1 effects are why large does cause lowering of blood pressure.
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