Mass XXX™ - ChocolateChocolate | GNC
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Item # 386585



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Size: 6.2 lb(s).

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Product Information



You can get even more out of every workout session when you make GNC AMP Mass XXX™ a part of your exercise routine. This protein-packed dietary supplement is clinically proven to help increase lean muscle mass with 40% fewer sets.* Plus, 3g each of Tri-MG Infusion™ and Creatine Matrix Blend help support athletic performance* and muscle protein synthesis^*, while micronized amino acids support key processes crucial to muscle growth and repair.^*

Feature Bullets

  • Clinically proven to help increase lean muscle mass, weight, strength and endurance with 40% fewer sets*
  • 50g of fast-, medium- and slow-digesting proteins, along with 11g of BCAA, 750 calories, plus carbohydrates and healthy fats for science-based nutrition, advanced muscle performance^* and to help maximize gains*
  • Creatine Matrix Blend with 3 forms of creatine may help improve training results and supports muscle protein synthesis^* 
  • Tri-MG Infusion™ is an powerful blend that delivers relentless support for athletic performance*
  • Micronized amino acids help fuel muscles* and support key processes crucial to the growth and repair of muscle^* 
  • Gluten-free dietary supplement
  • Naturally- and artificially-flavored, delicious chocolate taste


In an eight-week, randomized, double-blind, placebo-controlled study of healthy male volunteers, 18 subjects completed 3 sets of resistance training (RT) daily + the macronutrient blend in Mass XXX™, and 16 subjects performed 5 sets RT daily with no supplement. After eight weeks, subjects on the supplement showed equal gains in body weight, fat free mass (FFM), maximal muscle strength (MMS) and muscle endurance (ME) with only 3 sets RT per day compared to the control group who completed 5 sets RT per day.

^When used in conjunction with an exercise program.

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.



Nutrition Facts
Serving Size  4 level scoop(s)
Servings Per Container  13

Amount Per Serving     % DV

Calories 750  

Total Fat 6g   8%
Cholesterol 100mg   33%
Total Carbohydrate 123g   45%
  Dietary Fiber 4g   14%
Protein 50g   100%
Saturated Fat 4g   20%
Total Sugars 20g  

Calcium 560 mg   43%
Iron 5.1 mg   28%
Potassium 1320 mg   28%

Sodium  720 mg   **
Tri-MG Infusion™  3 g   **
   BETAPOWER® Betaine Anhydrous   **
Micronized Amino Acids  500 mg   **
   Micronized L-Arginine   **
   Micronized L-Leucine   **
Creatine Matrix Blend  3 g   **
   Dicreatine malate   **
   Creatine Ethyl Ester HCI   **
   Guanidinoacetate   **
   Creatine monohydrate   **
   L-Arginine   **
   L-Glycine   **
   L-Methionine   **
Dicreatine malate  890 mg   **
Creatine Ethyl Ester HCL  800 mg   **
Guanidinoacetate  500 mg   **
Creatine Monohydrate  400 mg   **
L-Arginine  300 mg   **
L-Glycine  80 mg   **
L-Methionine  30 mg   **

** Daily Value (DV) not established.
Other Ingredients
Maltodextrin, Protein Blend (Whey Protein Concentrate, Calcium Caseinate, Soy Protein Isolate), Cocoa (Processed with Alkali) , Natural and Artificial Flavor, MCT (Medium Chain Triglycerides), Lecithin, Salt, Acesulfame Potassium, Sucralose
Contains: Milk and Soybeans.
Label (click image to enlarge)

How To Use

As a dietary supplement, mix 4 level scoops (205 g) with 16 fl. oz of cold water or milk. Consume 1-2 servings daily. On training days, consume post-workout. On non-training days, consume first thing in the morning or between meals. Consume ample amounts of water while taking this product.
Consult your physician to using this product if you are pregnant, nursing, under 18 years of age, taking medication, or have a medical condition. Discontinue use two weeks prior to surgery. , Keep out of reach of children.
Store in a cool dry place.
Distributed by:
General Nutrition Corporation
Pittsburgh, PA 15222


4.4 / 5.0
17 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
not impressed
doesn't mix well in shaker. normally I'm eating chunks of it, think I'm just going to stick with eating more.
December 16, 2018
3 weeks ago
Works great!!
December 13, 2018
3 weeks ago
Cool this one i like it
December 9, 2018
1 month ago
helps build muscles
I recommend this Mass XXX. I've been using this Mass since 2010 until now... I drink this after I push-up and it helps me build my muscles...
October 17, 2018
Good mass, tastes delicious, bad miscibility
I've noticed a weight increase of 10 lbs in one year, taking this only 3 times a week (and only half the serving size of 2 scoops; 4 scoops is the normal). It mixes great in a blender, but in a blender bottle it still remains chunky. The chocolate is the best tasting of the three i had, followed by vanilla. Cooks n Cream I could do without. Try the chocolate in a blender with ice, milk, banana, and peanut butter.
September 27, 2018
Works great, helps build muscle fast.
September 4, 2018
8 months ago
Love the extra calories but it mixes terribly
September 1, 2018
4 months ago
My body had to get used to it
I love when I get my discount on my product I will buy it forever good product you have to drink it the right way or it will affect your stomach. I will continue to drink it I love the product the way I mix it up and has put a lot of bulk on me.
August 3, 2018
6 months ago
Great Stuff.
August 2, 2018
5 months ago
Well the fact i never got the product because there was another shipment with the same tracking number I wasn’t able to get it.
July 22, 2018
5 months ago
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Browse 6 questions Browse 6 questions and 8 answers
Is this the same as your old product 'amplified mass xxx'?
judy d on Jun 5, 2018
BEST ANSWER: The woman at GNC said it was the same, but Rite Aid still has the original black and red container of Amplified Mass XXX........... The outside of the new container is different, the scoop doesn't even remotely resemble the other scooper and the directions for use are different. It tastes the same. I just purchased the new container so I'm guessing it's the same with 50 grams of protein per serving. Will soon know.
What about banana flavor????it's the best
Rick C on Jun 17, 2018
Will this help men over 50 years of age??
Stan S on Jun 16, 2018
BEST ANSWER: I'm 55. I've been packing on pounds and muscle. Put the beer can down and pick up the barbell.
Is this safe for college athletes?
A shopper on Oct 15, 2018
how was the taste?
A shopper on Jun 11, 2018
BEST ANSWER: It tastes amazing it's my favorite I been buying this brand for a while now love it highly recommended
How long before you see results?
A shopper on Oct 3, 2018
BEST ANSWER: Id say about a month. Works best when your a being consistent with taking it and working out.