Solaray® Brand Red Yeast Rice is rigorously tested to comply with our Green Screened® process to assure the highest quality formula. The Green Screened® process means our Red Yeast Rice is tested for impurities and contaminants, including citrinin (**screened using UPLC-MS down to 1ppm).  This stringent screening allows us to offer a pure, high-quality, non-irradiated source of Red Yeast Rice.