PUMP is an intramuscular (IM) injection containing a custom amino acid blend. Amino acids are the natural compounds that are used as building blocks by the body to create proteins. Amino acids, and the proteins that are made from them, are crucial to helping the body break down food, repair body tissue, grow, and perform many other bodily functions. Some people also use amino acid supplements to boost athletic performance and enhance muscle mass. Add our PUMP shot to help boost your metabolism, energy, and endurance.