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Optimum Nutrition Serious Mass
Some people would give anything to have a fast metabolism, but for you, as a weight lifter, it is stopping you from reaching your goals? Putting on quality weight isn’t as simple as consuming a massive load of fast-food every day. If you think you're ready for the ultimate bulk season, consider Optimum Nut
4.6
22 ratings
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I’ve been using Serious Mass by Optimum Nutrition for several weeks and I’m very impressed with the results. The product mixes well, tastes great, and makes it much easier to increase my daily calorie intake without having to eat huge amounts of food.
H
Helena · June 11, 2026
Tastes good
J
Jordan · February 7, 2026
MASS
Feel full after drinking it and mixes well in a shaker.
Chocolate, tastes great!