I dont know what it is but it sure tastes good real good in fact! It's crazy I can drink anything on tap and it tastes great DOS EQUES, TECATE, BUD, COORS, HIGHLIFE or whatever you throw at me if its on tap. Iam thinking about getting A beer dispenser in my place just so I can have my own all the time anybody else out there have A beer dispenser or ''kegarator'' as most people call it.