Announcing the Official GU Flavor of the Rock ‘n’ Roll Marathon Series!

We are excited to officially announce SALTED WATERMELON as the official GU flavor of the Rock ‘n’ Roll Marathon Series!

With 3,462 out of the 7,000 votes received, Salted Watermelon beat out Caramel Macchiato and Apple Cinnamon by a landslide, and will become the official on course flavor kicking off at the SUJA Rock ‘n’ Roll San Diego Marathon and ½ benefitting the Leukemia and Lymphoma Society on June 1st. 

What is GU?

GU provides athletes with a shot of 100 calories in the form of a patented carbohydrate blend (70%-80% maltodextrin and 30-20% fructose) to deliver high-quality, easily-digested and long-lasting energy for athletes in every sport and at all levels. GU also includes electrolytes to ensure proper hydration, an antioxidant blend to stave off muscle tissue damage and an amino acid blend to delay muscle fatigue.

Everything inside each packet of GU is engineered to do one simple thing: provide your body with the essential requirements it needs to keep going for miles and miles and hours and hours. It goes down easy, and it goes to work fast so you don’t have to slow down.


Voting Recap

We asked fans to choose from 3 NEW GU flavors (Salted Watermelon, Caramel Macchiato and Apple Cinnamon) and select their favorite– by popular vote! 

How We Did It


Rock ‘n’ Roll New Orleans Expo:

Fans placed their vote for the official GU flavor at our sampling booth at the Rock ‘n Roll New Orleans expo.


Fun Runs:

The Rock ‘n’ Roll Marathon Series and Ambassadors of Rock hosted Fun Runs in select markets such as San Diego, Los Angeles, Raleigh, and Chicago.  Runners sampled the 3 NEW flavors and voted for the official GU of the Rock ‘n’ Roll Marathon Series.   


Press Coverage:

The Rock ‘n’ Roll Marathon Series and GU Energy Labs were featured on the FOX 5 Morning Show in San Diego on February 10th. 

What Can You Do Now? 




Rock ‘n’ Roll San Diego:

Salted Watermelon, the official GU flavor of the Rock ‘n’ Roll Marathon Series, will be officially released race weekend, and will be sold in specialty retailers across the country. 

Visit the merchandise store at the expo to purchase the winning flavor. (Limited quantities available) 

  • Expo Day 1: May 30th from 11am – 7pm
  • Expo Day 2: May 31st from 9am – 5pm

Remember to fuel up with Salted Watermelon available at aid stations along the course! 

Pre-order Now:

CLICK HERE to pre-order a box of the official flavor, Salted Watermelon, before the official debut at Rock ‘n’ Roll San Diego Marathon & 1/2 Marathon on June 1st. Includes a box of 8 gel packets. 

Win a Box of GU

Upload or submit a photo to receive a FREE box of Salted Watermelon! The 10 photos to receive the most votes will be selected on June 5th as the winners. 

Photo Contest: 25x25-icon-instagram


  • Upload your photo using the upload tool or using Instagram with hashtag, #GUMOCRACYGREEN

Submission Guidelines:

The following types of photos can be submitted:

  • Running Photo
  • Sample Packaging (Available at RnRUSA & RnRSD expos)
  • Official Packaging (Available on course at RnRSD ONLY)