Vita Keratin Keratin Complex products provide the extra nutrients necessary-more keratin among them-to help keep the hair shaft strong, shiny and damage free. Regular use of Keratin Complex products is important so that the hair is well-maintained, and that the shell on the outside of the hair shaft itself is kept intact. Keratin itself is actually a protein, and is used for a number of things-in a number of different animals. Obviously found in hair, it is the outer shell of the human hair shaft.