When you are ready to start a bodybuilding program or weightlifting program, it will be a good idea to do some reading on supplements for gaining weight and building muscle mass. There are many to choose from and quite a few different manufacturers producing similar body building products. The main difference in the products is the amount of top ingredients for providing the best benefits. Since that is not always easy to determine, browsing some forums or talking to people actively working out in your gym is always a good source.