5 reviews
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O15 Nutrition | Stim-Free Preworkout 

Custom formulated for Mr. Olympia Brandon Curry, O15 Nutrition Expansion™ is an ingredient-dense, non-stimulant preworkout. It is built to provide skin-splitting pumps AND increase VO2 Max by up to 11x (for more reps, sets, and endurance).

Performance & Electrolytes

  • 2000mg Peak 02
  • 1500mg Betaine Anhydrous
  • 110mg Himalyan Pink Sea Salt
  • 157mg Magnesium Chelate


  • 6000mg L-Citrulline
  • 2000mg Glyercol™ HydroMax®
Expansion™ is designed to continually improve your performance each & every workout thereafter, and is loaded with ingredients backed by human-clinical studies!
Customer Reviews
5.0 Based on 5 Reviews
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Mike T.
United States United States
Expansion Lemonade

Wow. Great pump and lemonade flavor stacks well with my lemon lime Sniper. Will keep this a part of my stack

Luke I.
United States United States
Amazing flavor! Crazy pump!

I was skeptical about the flavor “bubble gum”. I thought it was going to be just super sweet mix without an actual gum taste...The flavor is on point! Taste just like Hubba Bubba gum. The pump was crazy only 2-3 sets into my workout. The ingredients are perfectly dosed! This product will definitely help cure the candy cravings during prep! I will buy again!

Aaron S.
United States United States
Love it

Real good pumps and focus from this product. Tastes just like out of the package bubble gum including that “chalky” feel that bubble gum leaves in your mouth for a minute. Very good

Scott F.
United States United States
Quality Product

Works as described

Carlos C.
United States United States
Expansion - BubbleGum

I love the product. One of the best Pump formulas hands down! I’ve had great pumps throughout my training, definitely recommend this product!

Nutrition Info

Warning Concerning California Residents: This product may contain chemicals known to the State of California to cause cancer and birth defects or reproductive harm.