12 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 12 Reviews
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Jorge L.
United States United States
Its different

Its different sceptical but im glad i tried it great preworkout i felt the pump… no crash no jitters amd in the sauna my body got full and even the muscles i didint work out got a pump excellent

Michael N.
United States United States
Yum taste great

Love this stuff. Taste fantastic. Lots of energy

A Tiger Fitness Customer
Kenneth v.
United States United States
You must try this

Awesome go pick it up. Great pump

JaeMo S.
United States United States
My new PreWorkout

Tastes great, warm and cold (bubble gum). No grit. Definitely feel it working but doesn't keep me awake after my late night workouts. I'm a FAN!!

Tiger Fitness Expansion Review
Norvell H.
United States United States
Buy This Product!!!

The taste is tremendous and the ingredients biologically agree with me so yeah the product from my standpoint is legit..Brandon Curry is the man!!! Did it mention it was Legit.....

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.