Optimum Nutrition Opti Lean Whey Chocolate (772g). Lean Whey. Helps to support lean muscle growth. 32 servings. 20g of high quality protein. Low fat with 1.0 g per serve. 95 Calories. Optimum Nutrition understands that it is important to limit sugar intake when leading a healthy diet and lifestyle.. New Lean Whey is made from the highest quality Whey Protein Concentrate. It comprises 17g of high quality protein, less than 92kcal per serve, less than 1g carbohydrate and less than 2g fat per serve, this is truly a lean product in every sense of the word.