Mass XXX Chocolate®
Amino Acids & ProteinBrand: GNC Pro Performance
Functions
Net Contents
6.1 lb
Serving Size
198 Gram(s)
Servings Per Container
14
Supplement Form
Powder
Bar Code (UPC/SKU)
0 48107 07645 0
Product Version
CODE 350858 EJG
Label Analysis
Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.
11 distinct active ingredients are disclosed in Supplement Facts.
Every active ingredient discloses a specific amount per serving.
11 ingredients report a %DV; 1 meet or exceed 100% DV.
This analysis is generated algorithmically from label data for educational reference only. It is not a product endorsement, ranking, or medical advice.
Allergen Guide
Contains
- Milk
- Soy
Allergen flags are parsed automatically from the official label's claims and statements. Always verify against the physical product label before use, especially if you have a severe allergy.
Supplement Facts
Serving Size: 198 Gram(s) · 1–2 per day
| Ingredient | Amount Per Serving | % Daily Value |
|---|---|---|
| Calories | 990 {Calories} | — |
| Calories from Fat | 140 {Calories} | — |
| Total Fat | 6 Gram(s) | 9% |
| Saturated Fat | 4 Gram(s) | 20% |
| Trans Fat | 0 Gram(s) | — |
| Cholesterol | 110 mg | 49% |
| Sodium | 620 mg | 36% |
| Potassium | 1350 mg | 60% |
| Total Carbohydrates | 124 Gram(s) | 41% |
| Dietary Fiber | 4 Gram(s) | 16% |
| Sugar | 20 Gram(s) | — |
| Protein | 50 Gram(s) | — |
| Vitamin A | — | 20% |
| Vitamin C | — | 6% |
| Calcium | — | 100% |
| Iron | — | 30% |
Percent Daily Values are Based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Other Ingredients
Target Groups
Label Claims
Directions & Suggested Use
Suggested/Recommended/Usage/Directions
DIRECTIONS: Mix 4 level scoops (198g) with 16 ounces of cold water or milk. Consume 1-2 servings daily.
Warnings & Precautions
Precautions re: Allergies
CONTAINS: Milk and Soybeans.
Storage
Storage
Store in a cool, dry place.
Formulation
Formula re: Contains
CONTAINS: Milk and Soybeans.
Formula re: Contains
PROVIDES 66 GRAMS OF QUALITY PROTEIN WITH 990 CALORIES
Formula re: Contains
INCLUDES A BLEND OF AMINO ACIDS AND MEDIUM CHAIN TRIGLYCERIDES FOR ENERGY
Formula re: Contains
This special blend of carbohydrates includes 83% complex carbohydrates (maltodextrin and fiber) and only 17% sugar. Each serving of this highly specialized sports formula boasts 66 grams of quality protein, 146 grams of carbohydrates and 990 calories when mixed with 2% milk. It also features a blend of essential fatty acids including some healthy unsaturated fats, medium chain triglycerides (MCTs) which are quickly absorbed for energy, and no trans fats. This combination of protein, carbs and fat help to provide the extra-calories that you need to put on the added pounds that you want.
Other Label Statements
Brand IP Statement(s) re: (c), (TM), (SM)
GNC Pro Performance(R) Mass XXX(TM) is GNC's first clinically studied mass builder. Serious athletes know that while trying to achieve muscle mass and strength gains, proper sports nutrition is a must. GNC Pro Performance(R) Mass XXX(TM) has proven this concept and has shown to increase lean mass, muscular strength and endurance with 40% fewer repetitions.* It also improves efficiency for strength, endurance and mass gains.* GNC Pro Performance(R) Mass XXX(TM) is the right nutrition formula to help you meet your nutritional needs and keep you fueled while working towards gaining muscle mass and strength.
General Statements: All Other Content
3 SETS + MASS XXX(TM) = 5 SETS EQUAL GAIN IN MASS, MUSCLE STRENGTH AND ENDURANCE*
General Statements: All Other Content
TYPICAL AMINO ACID PROFILE PER SERVING: Alanine 2151mg Arginine 1673mg Aspartic Acid 5048mg Cystine 993mg Glutamine 8877mg Glycine 1068mg Histidine 1113mg Isoleucine^ 2892mg Leucine^ 4968mg Lysine 4106mg Methionine 1058mg Phenylalanine 1960mg Proline 3099mg Serine 2549mg Threonine 2877mg Tryptophan 937mg Tyrosine 1733mg Valine^ 2898 mg Total 50000mg ^Indicates Branched Chain Amino Acid (BCAA)
Brand IP Statement(s) re: (c), (TM), (SM)
In an eight week randomized, double-blind, placebo-controlled study of healthy male volunteers, 18 subjects completed 3 sets resistance training (RT) daily + GNC Pro Performance(R) Mass XXX(TM), and 16 subjects performed 5 sets RT daily with no supplement. After eight weeks, subjects on GNC Pro Performance(R) Mass XXX(TM) 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.
General Statements: All Other Content
While working to achieve mass gains, it is essential that you get enough calories, including a balance of quality carbohydrates, protein and fat. Falling short on any of these nutrients can obstruct your performance goals.
General Statements: All Other Content
Amino Acids are needed to build the various proteins used in the growth, repair and maintenance of body tissues such as skin, bones and muscle. BCAA help fuel your skeletal muscles, preserve muscle glycogen stores and help to reduce the amount of protein breakdown. Adding BCAA to your diet can be anti-catabolic and have a protein=sparing effect. Arginine is an essential precursor of nitric oxide and is involved in the body's natural formation of creatine.
Brand IP Statement(s) re: (c), (TM), (SM)
In addition, GNC Pro Performance(R) Mass XXX(TM) contains a special blend of carbohydrates, the body's primary source of energy.
General Statements: All Other Content
ULTIMATE LEAN MASS BUILDER
General: Product/Version Code
CODE 350858 EJG
General Statements: All Other Content
Carbohydrates are an important fuel during intense or high intensity exercise. Carbohydrates also replenish energy stores after high intensity exercise. Furthermore, the combination of dietary protein with carbohydrates following resistance exercise supports muscle protein synthesis.
General Statements: All Other Content
CLINICALLY PROVEN TO BUILD MUSCLE MASS WITH 40% FEWER REPS
General Statements: All Other Content
Natural and Artificial Flavor
Seals/Symbols
CLINICALLY RESEARCHED
General Statements: All Other Content
Two cups of reduced fat milk provides an additional 240 calories, 9g total fat (6g saturated fat), 36mg cholesterol, 250mg sodium, 750mg potassium, 23g total carbohydrate (23g sugars), and 16g protein.
General Statements: All Other Content
Calories: 2000 2500 Total Fat Less than 65 g 80 g Sat. Fat Less than 20 g 25 g Cholesterol Less than 300 mg 300 mg Sodium Less than 2400 mg 2400 mg Potassium 3500 mg 3500 mg Total Carbohydrate 300 g 375 g Dietary Fiber 25 g 30 g Calories per gram: Fat 9 ~ Carbohydrate 4 ~ Protein 4
General Statements: All Other Content
NOTICE: Use this product as a food supplement only. Do not use for weight reduction.
General Statements: All Other Content
Significant product settling may occur.
Brand IP Statement(s) re: (c), (TM), (SM)
GNC Pro Performance(R) Mass XXX(TM) supplies key amino acids such as arginine and the Branched Chain Amino Acids (BCAA); isoleucine, leucine and valine.
Manufacturer & Distributor
Distributor
General Nutrition Corporation
Pittsburgh, PA, 15222
Other
1-888-462-2548
Market Reference
Gnc AMP Mass XXX with Myotor
GNC4.1(220)$86.99GNC Pro Performance Weight Gainer
GNC3.5(3500)$34.99GNC Pro Performance Bulk 1340
GNC4.2(1300)$54.99GNC Pro Performance Bulk 1340 Double Chocolate 15 Servings
GNC4.2(1300)$84.99GNC Pro Performance AMP Amplified Mass XXX Chocolate 6 lbs.
Silkrute4.5(289)$111.19Optimum Nutrition Serious Mass
GNC4.7(29000)$74.99GNC Pro Performance Bulk 1340 Cookies and Cream
GNC4.2(375)$54.99Gnc Pro Performance 100% Whey Protein Powder
GNC4.0(177)$99.99
Where to Buy Locally
Enter your city or ZIP code to find supplement & health stores in your area that may carry this product.
Research & Studies
A guide to understanding dietary supplements
SM Talbott - 2012 - api.taylorfrancis.com
… that using dietary supplements to promote health and reduce … health food outlets such as General Nutrition Centers (GNC), … categories of dietary supplements can be found in most mass …
201256 citationsPro-hormones and Body Image: How Much is Too Much?
K Magdziak, N Osman, A Tvaroha, J Ding, JM Fagan - 2011 - rucore.libraries.rutgers.edu
… Supplements which claim to be “prohormones” can be purchased at a local GNC or other health food establishment along with something called “testosterone boosters”. Testosterone …
20111 citationsEffects of Dark Chocolate on Physiological and Anaerobic Performance Among Healthy Female and Male Adults
G Balasekaran, YC Ng, S Foong, XRR Ong, P Boey - Nutrients, 2025 - mdpi.com
… to enhance sporting performance, recovery and metabolic health [3]. … for certain supplements that improve sporting performance to … that dark chocolate (DC), another dietary supplement, …
2025Daidzein from dietary supplement to a drug candidate: An evaluation of potential
M Ubaid, Salauddin, MA Shadani, SM Kawish… - ACS …, 2023 - ACS Publications
… how it has been incorporated into health supplements. The global market capitalization of DDZ reflects its importance as a multitargeted drug with numerous patents and clinical trials. …
202342 citationsThe Effect of Dark Chocolate on Metabolism and Performance in Trained Cyclists at Simulated Altitude
KA Shaw - 2019 - harvest.usask.ca
… To determine if dark chocolate could be a viable sport supplement in endurance athletes, it … that you get clearance from a health care professional before you participate. You should not …
2019Report of the department of defense 1, 3 dimethylamylamine (DMAA) safety review panel
CJ Lammie, SP Lead - The Pentagon: US Department of Defense, 2013 - pink.citeline.com
… from all three Services, Health Affairs and the Army Public Health Command to evaluate the … cases of adverse medical events associated with DMAA-containing supplement use were …
20136 citations
Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2015-02-25. DSLD Label ID: 16734. This information is provided for educational reference only and is not medical advice. Always follow the product label and consult a doctor or pharmacist before use.
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