Catalase is an enzyme that helps to counteract the production of hydrogen peroxide in the body. It is the hydrogen peroxide that bleaches our hair and makes it lose color. As we age, we make less catalase so taking it as a supplement helps to prevent the production of H202 at the site of the follice and therefore reduce the greying effect. This research was initially published in a 2009 study in the Federation of the American Societies for Experimental Biology’s journal. Some people, like yourself, have great results but as with any therapy, results will vary from person to person. Warm regards, Dr. Passero