Like it or leave it but not all mass gainers are designed to be the same. If you are tired of trying to gain weight through fat laden meals that only make you feel bloated and offer no mass, then its time to switch to mass gainers, shakes and bars to strengthen your mass gaining phase. Mass gainers have been classified under the category of dietary supplements by regulatory authorities across the globe. Dietary term is applied to mean nutrition for the whole body and not just for post or pre-workout sessions. They are not to be treated as meal replacement foods but a “supplement” to your existing diet.