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CLINICALLY PROVEN STRENGTH AND MASS GAINER: GNC AMP 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 LEAN MUSCLE MASS WITH 40% FEWER SETS: Mass XXX’s macronutrient blend 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.
ENHANCED FOR IMPROVED STRENGTH AND 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: Unlike most mass gainers with proprietary blends, Mass XXX is certified Banned Substance Tested and formulated to help you gain mass without compromising your goals.
Product Description NUTRITIONAL FOUNDATION CALORIES - Four scoops provide 780+ calories when mixed with water
CARBOHYDRATES - 127g of carbohydrates fuel energy utilization during training and replace glycogen stores post-exercise
Carbohydrates also prevent the body from using protein as energy
PROTEIN - 50g of fast, medium, and slow-digesting protein per serving, providing fuel for working muscle, recovery, and maximum gains^*
POWER PLUS BLEND BETAINE - BETAPOWER, a patented betaine anhydrous, clinically dosed to support power and enhance athletic performance*
CREATINE BLEND - Creatine monohydrate and micronized creatine monohydrate join forces to fuel high intensity exercise and support muscle protein synthesis*
MYOTOR - An herbal blend of Sphaeranthus indicus Flower Head Extract and Mangifera indica Bark Extract, clinically proven to improve muscle strength with half the exercise in as early as 2 weeks^*
CREATINE PRECURSOR - This amino blend includes L-Arginine, L-Glycine, and Micronized L-Methionine, 3 precursors essential for creatine synthesis MICRONIZED AMINO ACIDS MICRONIZED L-GLUTAMINE - Glutamine, one of the most abundant amino acids found in muscles, is involved in protein synthesis
Intense exercise can contribute to the depletion of muscle glutamine stores by increasing the release of glutamine from muscle cells*
MICRONIZED L-ARGENINE - Arginine is a precursor for synthesizing nitric oxide, proteins, and creatine - key components for fueling performance and gaining mass^*
MICRONIZED L-LEUCINE - An essential amino acid, Leucine is crucial to regulating muscle protein synthesis, fueling muscle cells, and supporting protein balance^*
IMMEDIATELY Nutritional support you're meeting your macro goals with 50g high-quality protein, 780+ nutrient-dense calories, up to 130g of carbohydrates and healthy fats
A satisfying shake available in 4 delicious flavors to support your mass gaining and performance goals^*
2-6 WEEKS With clinically proven MyoTOR, you can expect to see rapid performance results in as early as 2 weeks^*
With a high calorie diet and appropriate strength training program, plus 1-2 servings of Mass XXX^* per day the scale will start to move
Expect weight gain and muscle growth to the MaXXX^*
With the Power Plus Blend and Micronized Amino Acids, you'll feel beneficial muscle fuel for exercise during intense training
Experience max performance with 40% fewer sets^*
Plus, when taken post workout, you'll notice improvements in muscle recovery
Feel confident your training is paying off
3-4 MONTHS & BEYOND The mass is on
You've met your gaining goals or are getting close! Consistency (and training) has paid off
You're feeling bigger, stronger, fitter and ready to accomplish your next fitness challenge! MASS GAINER PERFORMANCE THERMOGENIC TEST & POWER Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4
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99 BENEFIT CLINICALLY PROVEN STRENGTH AND MASS GAINER^* CLINICALLY PROVEN PERFORMANCE PROTEIN CLINICALLY PROVEN PROTEIN + THERMOGENIC CLINICALLY PROVEN PROTEIN + TEST & POWER CALORIES 780-800 200 200 200 PROTEIN 50G 40G 40G 40G BETAPOWER ✓ ✓ MYOTOR ✓ ✓ CREATINE ✓ ✓ AMINO ACIDS ✓ ✓ ✓ ✓ VELOSITOL ✓ ✓ ✓ ENZYME BLEND ✓ ✓ ✓ CAFFEINE ✓ FAQs WILL I GAIN MUSCLE MASS USING GNC AMP MASS XXX? GNC AMP Mass XXX was formulated and clinically proven to gain muscle mass when combined with a resistance training program and adequate calorie intake
Meeting your daily calorie goals to add muscle mass can be challenging, which is why Mass XXX helps you meet higher calorie needs
Plus it includes clinically studied ingredients to help enhance your bulking goals and improve performance
CAN WOMEN USE GNC AMP MASS XXX? Yes! While Mass XXX was clinically studied in men, the formula was designed to support muscle growth & performance gains for anyone looking to enhance their goals^*
SHOULD I USE IT BEFORE OR AFTER A WORKOUT? For best results, use 1-2x daily
On training days, consume one serving post-workout
On non-training days, consume 1 serving first thing in the morning or between meals as needed
DO I HAVE TO WORKOUT WHILE USING THIS PRODUCT? This product was intended to help your muscles recover and grow from your exercise program
