Proteins are made up of building blocks called amino acids. There are about 20 different amino acids that link together in different combinations. Your body uses them to make new proteins, such as muscle and bone, and other compounds such as enzymes and hormones. It can also use them as an energy source.

Building muscle requires consuming more calories than your body burns, and mass gainers offer an efficient method of meeting these elevated caloric requirements. This is especially beneficial for individuals with high metabolic rates or those who struggle to consume enough calories solely from whole foods.