And effective.
From: http://www.intelihealth.com/IH/ihtIH/WSIHW000/8513/31402/346470.html?d=dmtContent
Since the 1970s, there have been reports that red yeast lowers cholesterol and triglyceride levels, helping atherosclerosis or congenital heart disease. In March 2001, a U.S. District Court ruled that the red yeast rice extract product Cholestin contained the same chemical as the prescription cholesterol-lowering drug lovastatin (Mevacor) and therefore could not be sold without a prescription. This product is no longer available in the United States, but other products containing red yeast rice extract can still be purchased, mostly on the Internet.
According to the manufacturers website (accessed August, 2001), new and improved Cholestin contains policosanol, a natural product from the wax of honey bees. It no longer contains any red yeast. Policosanols are potent inhibitors of cholesterol synthesis and have been well-studied in clinical trials in Cuba and South America. As of June 14, 2005, the manufacturer's website says that Cholestin recently has been reformulated with a unique proprietary blend of ingredients, including Lipidol.