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Serious Mass is a high-quality gainer in the form of an all-in-one blend containing a high dose of quality carbohydrates. In addition, it is also a source of proteins that contribute to muscle growth, and there is no lack of vitamins, minerals or creatine. One serving has over 1,260 kcal, making it ideal for people who are trying to increase their calorie intake, for example, during the bulking phase.

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Serious Mass - Optimum Nutrition

4.7
Average from 506 reviews
(400 reviews)
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(20 reviews)
(13 reviews)
(13 reviews)
Most Beneficial Positive Review of Product

Μιχάλης

Verified purchase
One of the best mass-building protein supplements I have ever tried. I had already tried ON’s classic whey, so I also tested the gainer. I was not disappointed because I saw a great change in my
Most Beneficial Negative Review of Product

Adrian-Marian

Verified purchase
I took this product for 4 days, one and a half scoops each day. At the hospital (military hospital), my muscle enzymes and almost all blood tests came back unbelievably poor. I have never experienced
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Verified purchases (409)
Positive (477)
Negative (29)
Reviews in other countries (506)
  • sergiu

    Verified purchase

    6/9/2026

    Flavor: chocolate
    This is perfectly to my liking
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  • Alexandru

    Verified purchase

    6/9/2026

    I took a smaller amount than the one recommended, and I still gained weight—so for me, this is a very good gainer. I didn’t have any digestion problems.
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  • Ante

    Verified purchase

    6/9/2026

    A product that contains much more than one supplement can be very good and cost-effective as an all-in-one supplement.
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  • L.K.

    Verified purchase

    6/9/2026

    Great for gaining weight
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  • Mihael

    Verified purchase

    6/9/2026

    Very tasty
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  • A.D.

    Verified purchase

    6/8/2026

    That helped me to put on 8 kg
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  • M.K.

    Verified purchase

    6/8/2026

    Excellent taste, high-quality product
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  • dani

    Verified purchase

    6/7/2026

    recommendation
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  • Compari.ro

    Verified purchase

    6/7/2026

    Published on Compari.ro

    Delighted. ✓ Pros: I saw results in less than 3 months ✗ Cons: There were no negative experiences, but the sugar from the product may have effects on health if consumed in excess
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  • Compari.ro

    Verified purchase

    6/7/2026

    Published on Compari.ro

    Due to reviews ✓ Advantages: I do not recommend ✗ Disadvantages: It does not dissolve properly at all
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