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$25.95 $11.95

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$43.95 $20.95

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    When it comes to high quality weight gainers, it doesn’t get much better than Gain Fast 3100 by Universal Nutrition. Sometimes you need more than just a balanced diet and regular exercise – you need Gain Fast 3100. Gain Fast combines the very best nutrients in a calorie-dense formula that supplies all of the muscle-building support you need without the unhealthy junk food. With muscle booster, performance herbs, natural plant sterols, digestive enzymes, and muscle optimizers, Gain Fast helps you get big – fast!

    Four key blends serve four different aspects of muscle growth, including performance, mTOR activation and testosterone support, cognitive function, and a sturdy amino acid foundation. Arginine delivers massive pumps[1] while creatine fuels gains and performance[2] as a hearty dose of leucine activates the mTOR pathway.[31] And that’s barely scratching the surface!

    Gain Fast supports testosterone levels,[4] a key driving factor for muscle building.[5] It also delivers an effective dose of complex carbohydrates, the key to driving rapid muscle gains quickly. Gain Fast even helps you stay tuned in, focused, and energized for incredible performance that translates to greater muscle building results.[6] Gain Fast provides 3,100 calories and 37 grams of high-quality proteins, including fast and slow absorbing proteins, all to deliver the nutrition you need to build big, beefy muscle in one convenient serving.

    Gain Fast takes flavor to a whole new level with decadent flavors that taste smooth and creamy, the perfect reward you deserve for all of your hard work.


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    Universal Nutrition Gain Fast 3100 Supplement Facts


    Whether you want to bulk up or add some quality muscle mass, Gain Fast 3100 comes enhanced with muscle boosters, performance factors, natural plant sterols, EFAs, digestive enzymes, and muscle optimizers for rock hard lean muscle growth.


    Mix 5 scoops of Gain Fast with 16 oz of water or milk. Mix thoroughly, preferably in a blender with crushed ice for a rich, thick, delicious milk shake. For best results, take one to three servings daily in addition to regular meals. Use in conjunction with a proper training and nutrition program.


    Keep out of reach of children. Before beginning any exercise program, consult your health care practioner. Do not use as your sole source of calories.

    Featured Ingredients

    Anabolic Gaining Agents – Packed with compounds such as Arginine AKG, Beta Sitosterol, and Saw Palmetto, this advanced gaining complex supports testosterone levels and ramps up protein synthesis – the basis for muscle growth. These Anabolic Gaining Agents unleash your muscle building potential and support intense hard muscle gains.

    Metabolic Optimizers & Performance Factors – The harder you work at the gym or on the field, the more muscle you’ll be able to build. This performance complex combines beta-alanine, enzymes, and extracts such as Korean Ginseng to dramatically intensify your strength, power, and endurance for better performance and faster results.

    Lipotropics & Ergogenics – In this muscle-enhancing blend, creatine combines with glutamine and more to power up muscles with energy and strength. With 900 mg of ergogenic amino acids, this blend fuels your gains and performance in the gym.

    Gain Fast Specialized Amino Acid Complex – Each serving of Gain Fast contains an unheard of 37,000 mg amino acid complex featuring anabolic leucine, muscle-pumping arginine, and anti-catabolic valine to supply your muscles a concentrated dose of essential building blocks.

    High Performance Carbohydrate Complex – With a combination of high-energy glucose polymers, maltodextrin, and more, the carbohydrate complex digests slowly to minimize an insulin spike and blood sugar drop. They provide a long term source of energy and enhance the uptake of amino acids and other key nutrients directly into skeletal muscle.

    Q. Is Universal Nutrition Gain Fast a Healthy Option for Weight Gain?

    A. Gain Fast offers plenty of calories from healthy whole food options, including slow and fast absorbing proteins like whey, casein, and egg. Because the calories in Gain Fast are sourced from muscle building protein, carbohydrates, creatine, and other essential nutrients, Gain Fast is a safe and excellent option for weight gain.

    Q. Why Should I Choose Gain Fast Over Other Weight Gainers?

    A. Gain Fast offers more of what you need – quality protein, carbohydrates, and healthy fats – without the added junk fat that can actually hinder muscle gain. Gain Fast delivers hearty dose of calories from high quality sources to help you build a substantial amount of new muscle.

    Q. How Can I Get the Best Results With Gain Fast?

    A. For best results, mix 5 scoops of Gain Fast with 16 oz of water or milk and take one to three servings daily in addition to regular meals. Do not use Gain Fast as your sole source of calories, and make sure to use in conjunction with regular training and a proper nutrition program.

    Q. Will Gain Fast Cause Me to Gain Fat, or Muscle?

    A. Gain Fast is composed of muscle-building calories that are aimed towards supporting a significant increase in growth of lean muscle mass. When taken as directed in conjunction with regular weight-lifting and exercise, Gain Fast will help you build muscle and improve muscular definition.

    Sorry, we're out of stock

    Check out our Ten Best list:

    10 Best Mass Gainers

    Buy Gain Fast 3100
    – 2.55 lbs




    Buy Gain Fast 3100
    – 5.1 lbs




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