Amino acids
Amino acids are the building blocks and operators of cells, tissues, the immune system and help the absorption of nutrients. Amino acids are also the building blocks of muscle proteins, ie. your muscles are made up from them. They have many more functions as well! They help to regenerate and energize, making them a great addition pre-, intra- and post-workout. The body does not have to break down amino acids, so they can be quickly utilized.