Sabalselect Saw Palmetto (Serenoa repens) berry extract is standardized to contain 85–95% of the active fatty acids and sterols, including beta-sitosterol. Jarrow FORMULAS Saw Palmetto is a supercritical CO2 extract. The bark of Pygeum (Prunus africana) is standardized to 12% sterols, including beta-sitosterol, beta-sistosterone and n-docosanol.