GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder With Micronized Amino Acids, Creatine, Betaine, 780 Calories, 50g Protein, Vanilla, 13 Servings
GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder With Micronized Amino Acids, Creatine, Betaine, 780 Calories, 50g Protein, Vanilla, 13 Servings
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GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder With Micronized Amino Acids, Creatine, Betaine, 780 Calories, 50g Protein, Vanilla, 13 Servings

GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder With Micronized Amino Acids, Creatine, Betaine, 780 Calories, 50g Protein, Vanilla, 13 ServingsGNC AMP Mass XXX with MyoTor Vanilla 13 ServingsGNC AMP MASS XXX with MyoTor Cookies and Cream 13 ServingsGNC AMP Mass XXX with MyoTOR Protein Powder Targeted Muscle Building and Workout Support Formula with BCAA and Creatine Chocolate 13 ServingsGNC AMP MASS XXX with MyoTor Strawberry 13 Servings
Flavor:Vanilla-Out of stock

Key item features

  • Clinically Proven Gainer: Mass XXX mass gainer combines high-quality protein powder, key nutrients, and science-backed innovations—including MyoTOR, creatine, and BETAPOWER—to fuel proven results and performance
  • Increase Mass with 40% Fewer Sets: Delivers 50g of protein, including naturally occurring EAAs, plus carbs, and healthy fats—and it’s clinically proven to help get better results out of workouts
  • Improve Muscle Strength in As Early as 2 Weeks: MyoTOR® is clinically proven to accelerate improvements in strength with as little as 2 weeks of training and included in every serving of Mass XXX mass gainer
  • Improve Stamina: Take resistance training to a new limit with MyoTOR’s clinically studied support for improved muscle endurance and BETAPOWER’s athletic performance benefits
  • Banned Substance Tested: Product was tested and monitored for over 220 banned substances on the 2020 World Anti-Doping Agency (WADA) Prohibited list via LGC skip lot testing.
  • Backed By Science: Since 1935, GNC has been committed to meeting the highest standards of quality, safety, and efficacy while applying the most up-to-date advances in nutritional science so you can live well.
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4.1 out of 5 stars
stars119 ratings70 reviews
How item rating is calculated
  1. 5 stars68% (81)
  2. 4 stars9% (11)
  3. 3 stars7% (8)
  4. 2 stars3% (3)
  5. 1 star13% (16)
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Showing 1-3 of 70 reviews

Jul 19, 2023
MorganJ
5 out of 5 stars review

Great to help you get started or restarted after a long hiatus from the gym.

[This review was collected as part of a promotion.] If you are starting out in the gym or coming back after a long hiatus, take this stuff. You will gain mass and you will see bigger lifts at the gym. The taste isn't too bad either, just make sure you shake it really well. I usually get allergic to headaches from general why protein, but I had no problems taking this. If I took a break for a bit, I would use this to help me build back mass for sure.

Review from GNC
Helpful?6M9X8LJJ5FAE1399331462
Mar 18, 2022
DavidC
5 out of 5 stars review

That I was treated good and GNC won't steer you wrong

I absolutely love everything about this product. The Mass XXX is the best way to go if you want to improve your strength, weight lifting, and like it says you will see results. I've put on 20 pound's in less than a month. I think it was 3 and a half weeks. So over all it's a great product for anyone even beginner's. And it's not 20 pounds of fat or fluid it's actually 100% muscle mass!

Review from GNC
Helpful?6M9X8LJJ5FAE1399331462
Mar 19, 2022
Swoletrain
5 out of 5 stars review

Smooth as silk, Strawberry tastes great

Strawberry tastes incredible and mixes extremely smoothly with milk or water. At 4 heaping scoops of this stuff, I assumed it would feel like drinking sand but its as smooth as can be. I just started using and am no professional builder, so will withhold my judgment of the effectiveness supplement-wise.

Review from GNC
Helpful?6M9X8LJJ5FAE1399331462