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you will not gain lean mass while dieting... the best you can do is work hard to not lose what lean mass you already have. Control your caloric intake, cardio every day, dont miss meals and youll lean down nicely. All you need supplement wise is a good whey protein and creatine if you choose. Dont rely on supplements to reach your goals, get there with food and hard workk... THEN add in supplements to enhance the effect.