Supplements are just that, an addition to your diet and workout routine that can help you gain mass and muscle. They come in a variety of forms, from shakes and powders to bars and gels.
One of the most common supplements is protein. Protein is made up of amino acids, which are the building blocks of solid muscle mass. Whey protein, in particular, digests quickly and will help your muscles recover from a workout faster than they otherwise would. You can find it in powder form and blend it into a shake. Protein bars are another convenient choice.
Protein is just one of many popular and effective supplements. Visit your local vitamin or health supplement store for an exhaustive list of options.