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    ON Serious Mass
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    Optimum Nutrition Serious Mass - 5.45kg (12.0lb)

    Price: £44.99 free UK delivery
    RRP: £59.99 | You save: £15.00 (25%)
    16 Servings (Price Per Serving = £2.81)

    In Stock | Usually dispatched within 24 hours

    Buy 1 for £44.99
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    ON Serious Mass Reviews

    • really good flavor!! Recommend!

      vinny
    • gd weightgainer but the price keeps getting put up,

      craig
    • Ingredients are fantastic for the price you get this weight gainer for but unfortunately you have to add almost a full shaker of powder before it mixes well. the taste isnt too bad but the after taste is awful I bought the strawberry flavour so would avoid that one if you arent put off by now. Only real benefit is the price.

      White
    • BANANA IS THE BEST TASTE , GREAT SERVICE AND DELIVERY.ONLY BEEN USING FEW DAYS SO ILL WAIT A WHILE TO SEE THE WEIGHT LEVEL AND POST COMMENT FEW WEEKS 80 kg AT MOMENT .

      HALLY
    • I used a lot of weight gainer but this is the BEST.very good price, good taste and it WORKS!Don`t wait buy now 2packs!:)i was 82kg after 3weeks 87kg.
      So BUY if u would like to use a good weight gainers!

      Aren
    • great weightgainer best i ever had

      maco
    • Worked well. Used it to supplement my diet and get the extra calories in needed for growth. Added over 2 stone in 4 months. Granted, you will add bodyfat, but thats always going to happen when adding mass. Would definatley recommend! Suggested serving size is a bit on the large side. personally I used 3 scoops a day, adding about 1800 calories into my diet.

      freddieR
    • This is by far the best weight gainer on the market, especially at this price. It's not just a carb and protein product but has loads of other nutrients too, and is very low fat, and tastes great. For this price.what are you waiting for?

      john simpson
    • Worked well. Used it to supplement my diet and get the extra calories in needed for growth. Added over 2 stone in 4 months. The other bonus is that 1 bag lasts quite a while.

      pickles
    • Huge bag, stretches far when money is hard to come by these days! I add 1 regular scoop of protein powder to up the protein content of each serving. It’s good value for money and it works. For best results have 2-3 servings a day, and especially after workout.

      jakeyjakey
    • Good value for money, good quality, and the volume of the powder is excellent. Have been using for years and my muscle size and confidence has never been better!

      hackneyjoe921
    Next Review
    A very good quality weight gain product. As to be expected with all O.N. products, Serious Mass mixes easily and tastes good! This is what ON say about their product, Serious Mass: the ultimate in weight gain formulas. Serious Mass supplies you with the tools you need to pack on the pounds and develop the physique you've always wanted.
    Directions Add two heaping scoops (334g) of Serious Mass to a blend with 650-750ml of cold water or milk.

    New users may find it beneficial to begin with one half serving daily for the first week, gradually increasing to one or more full servings several times a day.
ON Serious Mass Comments

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