Nutrex Research Presents: Zack Khan U.S. Tour - Florida. Check out the new episode from Zack King Khans U.S. tour. Watch "King Khan's" final stop on his U.S. Tour. It's been a long journey, but what better place for Zack to end it all then the Sunshine State. Be sure to go to NUTREX.COM for more videos and information about "King Khan"