Lean Whey bar is high in fibre and low in sugars, they help support lean muscle growth & maintenance with added ingredients; CLA, L-Carnitine & Green tea. Opti-Lean Whey bars can be used by anyone who wants to add more quality proteins pre or post exercise to support or maintain lean muscle growth. People who work hard at looking good because they want to feel good. Watching what you eat and exercising can be a lifestyle balancing act, and Optimum Nutrition’s new Opti-Lean range is here to help. Opti-Lean Whey bar supports lean muscle growth & maintenance.