The main ingredient of vydox is L-Arginine. I take the supplement (just l-arginine...not vydox) regularly myself among others listed below in the second link. All vitamins and supplements can be found at the grocery store really cheap. Usually found in a daily supplement or found naturally in your daily diet of foods. They are not kidding when they say eat your Wheaties.
http://www.webmd.com/vitamins-and-su...-libido?page=2
http://www.oneextraordinarymarriage....s-and-minerals