Chocolate Natural and Artificial FlavorClinically ResearchedGNC Lean Shake is complete with well-balanced ratios of high quality protein, vitamins, minerals and fat. Proven effective for weight loss, Lean Shake can also help reduce cholesterol and support lean muscle mass and a healthy metabolism.** When used in conjunction with the provided meal and exercise plan, this delicious oat-based shake can help you achieve and maintain your weight loss goals. It features a patented fiber-rich blend that increases your feeling of fullness and satiety so you eat less and wait longer between meals. This combination of functionally-specific fibers includes oat-beta-glucan. Oat-beta-glucan is a naturally-occuring and powerful soluble fiber found in oat bran; it is known as a low-glycemic fiber that supports normal, healthy blood glucose levels. Oat bran and fiber have a slower and more sustained effect on blood sugar and energy levels than when consuming high-glycemic carbohydrate food such as pastries, breads or pasta. A randomized clinical study consiting of 98 healthy participants compared the use of Lean Shake in conjunction with the Meal and Exercise Plan (total daily caloric intake of 1500 calories) to a 1500 calorie diet alone. This study resulted in nearly twice as much total weight loss and four times greater reduction in total cholesterol among the Lean Shake users upon completion of 12-weeks.