In the human body, amino acids not only form the elementary structural units of voluntary, or skeletal, muscle tissue - such as the biceps, quadriceps, etc. - but they also form the structural units of muscle tissue. -But they also form the elementary structural units of our involuntary muscles - like the heart. As well as contributing to muscle formation, each amino acid has a specific function in the body; these functions include assisting in the transport of long-chain triglycerides and dietary fat to cells to provide energy; stimulating the pituitary gland to secrete growth hormone, involved in the development of lean muscle tissue and which mobilizes fatty acids from adipose tissue; and - very importantly - supplying the body with nitrogen. One of the most controversial issues surrounding amino acids is their absorption when taken in capsule or tablet form. In the past, capsules entered the body more quickly; however, this is no longer true: following technological breakthroughs in the manufacture of magnesium stearate-based tablets, modern tablets can actually dissolve faster than capsules.