The most common muscle building supplements are creatine and amino acid precursors (in particular, tryptophan). Creatine and tryptophan are both essential amino acids that are often missing in people who have a deficiency. However, they can be used to boost the levels of other amino acids, which can boost performance. The most common types of amino acids are tryptophan, leucine, and lysine. Most supplements are very expensive. You will need to be a professional or have a doctor's recommendation before you buy a supplement, as there are potential health risks associated with some of them. There are some supplements that can be used to enhance the immune system, including zinc and fish oil. Other supplements are for treating asthma, depression, and certain types of allergies. For more information about each of these supplements, read our articles about supplements for muscle building.
4. Use a muscle-building supplement that works! If you are interested in building muscle, start with the best supplement. If you don't want to buy a full product, or just want to use a supplement to improve your overall health, you can do so. For instance, the supplements that I recommend have been proven to work for muscle-building and other health issues.