This product is officially endorsed by Michael Phelps. You can verify this at his website: go to http://www.michaelphelps.com/ and click on the english version - then click on "Links".

Most people think athletes actually drink Gatorade and the stuff they sell consumers in convenience stores - not true. Athletes demand real nutrition and fuel - not sugar water.

PureSport™ Nutritional Performance Sports Drinks with Protein

Human Performance Labs (HPL) develops superior nutritional performance sports drinks with protein for athletes of all types, from world class professionals to club sport amateurs and weekend warriors.

Created by Dr. John Ivy, renowned Chairman of Health and Kinesiology at the University of Texas at Austin, PureSport Workout and PureSport Recovery formulas (patent pending) nutritionally enhance the human body’s performance during and after strenuous athletic activity.

The science on why PureSport is different is here:
http://www.puresport.us/about

Ian Crocker, Brendan Hansen, and Aaron Peirsol are also official endorsements.