The following is a summary of what is listed as the best products that contain the highest amount of essential amino acids for muscle building and strength gains, plus the best protein powder for muscle building. 1. Creatine monohydrate: Creatine monohydrate is a creatine (Cr) molecule, and is used for its capacity to increase muscle size. Creatine is produced in your body and is transported to the muscles by a process known as "uptake" by muscles. The amount of creatine found in the muscles is dependent on your body's metabolism. Some people require a higher intake of creatine to achieve muscle size, while others don't. Creatine is a natural compound found in the body. Its effects are a result of creatine's ability to activate specific muscles, especially those muscles required to increase the size of the muscles that are responsible for your strength, endurance and power. While creatine has been used for decades, it is still used by many people to achieve their goals. It is not as effective as some other supplements. Some supplements may work more effectively with certain people than others. The amount of creatine required to reach the desired level of muscle growth varies based on a number of factors including age, sex, health status, and more.