Hyalluronic acid is a natural substance produced by the human oraganism. It is the "filler" substance between the collagen and elastin fibers of ther skin. It is very important since one particle of hyalluronic acid can bind more than 1000 times its own weight in moisture. With the passing of time, our body produces less and less of this important substance, and as a result wrinkles, skin discoloration, and free radicals set in.