100% Action Labs Formulated Prostate Formula With Beta-S Phytosterol Complex Dietary Supplement Beta-Sitosterol for Men is formulated as a special blend of plant based phytosterols and citrus polysaccharides to provide nutritive support for men's health. Action Labs Formulated is a designation that identifies special Natural Balance products that are designed to address specific concerns and meet our exacting quality standards. Beta-Sitosterol for Men has been formulated to provide the health benefits associated with Beta-Sitosterol. Found as a naturally occurring substance in plants, Beta-Sitosterol is referred to as Beta-S and has been used traditionally to support men's health.