Whey Protein is one of the best globally-recognized proteins for building muscle or gaining weight. It contains all the essential amino acids and has a high biological value, meaning that your body is able to absorb and use all of the amino acids present, instead of letting some of them pass through your digestive system. Whey also digests quickly and goes down easily in a protein shake or smoothie, so it’s easy to consume enough.
Weight gainers, sometimes referred to as mass gainers, are high-calorie shakes that people use to help them add weight. They are very good for slim people who are having trouble eating enough calories to gain weight.