16 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 15 Reviews
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Justin H.
United States
Next level

Solid pump, does give a an extra pick me up. I prefer to use in my infra workout. Makes the work outs last longer and stronger. Best part you do not feel it come down super quick like most pump product. I stay pumped for a few hours

Robert S.
United States United States
stim free is great, flavor is really good and not overwhelming

i prefer this over anything for my pre-workout, i use a lot of caffeine daily so the stim free is the choice for me

Jim A.
United States United States
Great product

I use this with my other pre workouts and it adds extra energy and focus.

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

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.