Thanks. Knowledge of what Price called "activator x" (and confirmed by no fewer than three other independent groups) is well-worth spending the $ 20 to get his book. Nevertheless, the short version is that activator x appears to be a substance formed in the body when three substances are caused to simultaneously be present: 1) cod liver oil; 2) broth from organ meats; and 3) the liquid portion of liquid butter crystallized at 70F for 24 hours, obtained from cows eating rapidly-growing grass in either spring or autumn. This last point is not bullcrap ! The powerful results this can provide are unbelievable to most people who have not witnessed them for themselves. Gumline recession can be reversed, and remineralization of teeth (autoreparation of carious lesions) can be effected. Get the book !