Saw palmetto (Serenoa repens) is a dwarf American palm native to the extreme southeastern United States. A lipidosterolic extract of its berries contains fatty acids (especially lauric acid), phytosterols, monocylglycerides, and polysaccharides. Fatty acids constitute more than 80% of the extract and are thought to be the most clinically effective component. It is widely used to treat benign prostatic hypertrophy (BPH). The berries themselves are less well absorbed than the extract and are therefore believed to be less effective.
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