4. Lysine
Lysine ranks 4th in our list of most important amino acids for muscle growth and hair loss. It is often made into medicine because of the benefits it provides the body. It is responsible for preventing cold sores and is made into medicine usually applied to the skin to treat some dermatological conditions. One of the most beneficial uses of Lysine is that it can be taken as a supplement to improve athletic performance. This is essential for those wanting to get the most of their workout routines. Since it helps the skin, it also protects hair, keeping it healthy.