Mass gainer supplements are a great way to increase your calorie intake with muscle building nutrients. For people that find it difficult to gain weight or have life styles that limit their ability to consume sufficient amounts of protein and calories to gain weight, mass gainers are the solution. If you typically eat 3 meals each day you will find that by simply adding 2-3 mass gainer shakes into your diet every day you will significantly increase your overall calories and probably double your protein intake. When you are training hard your body will want to respond by increasing muscle mass but if you are not supplying your body with adequate nutrition then this becomes impossible. By increasing your calories and protein by supplementing with a mass gainer you will allow your body to grow as much as possible from your hard work and training.
Mass gainers usually contain protein, carbs, MCT oils, creatine and multi-vitamin powder. The main thing to look for in a mass gainer is an appropriate ratio of protein and carbs. Typically most mass gainers start at about 1:1 protein to carbs ratio and from there the carbohydrate ratio increases. For people looking to do more of a "clean bulk" it will be better to go with a 1:1 ratio. For people that find they can't gain weight no matter what they do or just want to gain as much weight as fast as possible it will be better to look at products with a 1:2 or 1:3 ratio.