Every time you do an intense workout some of your muscle cells get damaged and destroyed. This is a natural part of the muscle regeneration process, but if you hope to build muscle mass, muscle recovery supplements are essential. Lost muscle cells must be replaced with lots of new muscle cells in order to achieve growth. It is important to train regularly to develop muscles, and it is equally important to give yourself the proper nutrition to bulk up. Muscle recovery supplements provide the amino acids your muscles need to synthesize new cells and tissue. These supplements also supply your body with various other nutrients, depending on the product.