Free Radical

What is a free radical?                

In terms of skin chemistry a free radical is a messenger molecule. It is produced in the skin cells in order to send messages between them. That way the cells communicate especially when under a threat. If a cell wants to give its neighbours a signal, it produces a free radical. This free radical starts interacting with other molecules.  In the interaction the other molecules can get altered and some become free radicals themselves. That produces a cascade effect and the other cells get the message.