Available saw palmetto supplement for prostate support, saw palmetto supplement for hair loss, chemical free botanical hair colour saw palmetto is by far the most studied and most effective medicinal herb to treat benign prostate hyperplasia symptoms and androgenetic alopecia.it inhibits the 5-alpha reductase enzyme, therefore reducing dht production.using saw palmetto to treat bph may be for many men a safe and effective alternate to prescription medications and surgery.