Optimum Nutrition Serious Mass 6lb

(95 reviews)
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  • description
  • nutrition facts
    • Ideal Formula to Support Weight Gains 
    • 1,250 Calories per Serving to Help Support a Calorie Surplus
    • 50 Grams of Blended Protein per Serving to Help Build and Maintain Muscle
    • 252-254 Grams of Carbohydrates (with no added sugar) to Help Fuel Workouts
    • 3g Creatine Monohydrate with added Creatine


    To gain weight, you need to consume more calories than you expend. For many aspiring to hit their calorie goals and put on size, a highly active metabolism, weak appetite or on-the-go lifestyle can make it a real challenge to get enough calories from food alone.

    SERIOUS MASS is the ultimate muscle building and weight gain formula. With 1,250 calories per 2-scoop serving and 50 grams of protein to support muscle recovery, this powder makes the ideal post-workout and between meals shake for sizing up your goals. SERIOUS MASS provides you with the tools you need to support your weight gains goals.


    • Training longer and harder to gain more muscle
    • Finding it difficult to consume enough calories through food alone
    • Finding it challenging to gain weight regardless of your dietary intake.

    Serious Mass provides you with all the tools you’ll need to pack on the pounds.


    • 1,250 Calories per Serving to Help Support a Calorie Surplus for Weight Gain and Muscle Building
    • 50 Grams of Blended Protein per Serving to Help Build and Maintain Muscle
    • 252-254 Grams of Carbohydrates (with no added sugar) to Help Fuel Workouts and Aid in Replenishment of Glycogen Stores
    • 3g Creatine Monohydrate To Support Muscle Strength, Power And Size When Combined With High-Intensity Activities
    • 20 Additional Vitamins and Minerals (including L- Glutamine)
    • Ideal Formula to Support Weight Gains
    • Available in a Range of Sizes and Great Tasting Flavours
    • Enjoy Post Work-out and Between Meals


    Mix 2 scoops of the powder into 700-720ml of cold water or milk using an electric blender. This allows to you add in fruits, peanut butter and other calorie-contributing foods. TIP: New users should start with a 1-scoop half serving. Use post-workout and/or between meals to add calories, carbs and protein to your healthy, balanced diet.

    How can I put on weight safely?

    We all know that protein is the key ingredient for increased muscle growth. We need to consume high-quality protein every few hours or so throughout the day to adequately fuel muscle recovery and repair after workouts. 

    However, for those of us who are naturally slimmer and struggle to put on weight, increasing muscle size can be a lot harder to achieve. Many weight lifters need to look at the number of carbohydrates and calories they're consuming to increase overall mass and gain weight. 

    If you want to bulk up and increase muscle mass, we recommend increasing your intake of healthy fats, such as Omega 3 & 6 and carbohydrates with a low glycemic index (Low GI). Low GI foods aren't loaded with sugars that cause a spike in insulin levels in the blood and will keep you feeling energised and full well after eating. 

    Low GI foods: 

    • Most fruit and veggies
    • Nuts
    • Low-fat dairy products
    • Pasta
    • Brown rice
    • Grainy bread
    • Oats.

    We also recommend strength training in short, sharp sessions rather than taking long rests in between sets. To keep the intensity up whilst training, we recommend switching your phone off and/or training solo if your gym buddies are a distraction.

    Lastly, don't forget to take rest days! The saying less is more, couldn't be any more true when it comes to muscle growth. Overdoing it regularly can lead to muscle deterioration and inhibit your ability to repair and grow. If you're feeling particularly sore, listen to your body and take a well-needed rest from the gym.

    Optimum Nutrition

    Optimum nutrition’s been in the game since the late ’80s. Made in the USA using state-of-the-art manufacturing processes and facilities, you can rest assured each product is formulated with uncompromising quality and innovation.

    • Nutrition Information
    • The Nutritional Information stated above should be used as a guide only. Actual values may change from time to time if the manufacturers update their formulation. Values will also vary depending on flavours and sizes.

      Please click here to contact us if you have any questions regarding this product's ingredients.

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