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A mass gainer supplement is a product that is designed to help people gain weight. These supplements are usually high in calories and protein and are often used by people who are trying to build muscle. Mass gainer supplements can be a great way to increase your calorie intake, but it is important to make sure that you are using them safely. If you are thinking about using a mass gainer supplement, cprarticles site best option to provide basic information, it is important to talk to your doctor first.