Optimum Nutrition Serious Mass Weight Gainer container being scooped by a person, suitable for post-workout nutrition and muscle building

More About Our Weight Gainers

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Build muscle mass and gain weight with high quality calories from protein, carbohydrates and more.

Optimum Nutrition Serious Mass, high-calorie protein powder, 12 lb container for weight gain and muscle recovery

Serious Mass

Fuel muscle growth with Serious Mass™ shakes, packing 1,267 kcal each. Elevate your training with serious gains and unbeatable taste!

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Optimum Nutrition Gold Standard Gainer, 2.73 kg container, ideal for post-workout nutrition and muscle building

Gold Standard Gainer

771 kcal per serving, 50g whey protein isolate, premium carbs - the pinnacle of weight gain nutrition.

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Why Weight Gainers?

Putting on weight may seem like an undesirable goal to some, but to others it may be their top priority. So why would one want to gain weight in the first place? Well, that depends. Both men and women may actively seek ways to put on mass to help build their physique or achieve an ideal body weight.

If dietary needs are unmet through food alone, then you may consider a gainer to help meet caloric needs. Gainers are high calorie supplements taken with the intent to gain weight or help maintain weight. They are intended to supplement the diet, not replace it. Gainers can be a convenient way to help boost calorie intake. Gainers can be taken post-workout, between meals, with meals or whenever you simply need a calorie boost. New users may find it beneficial to begin with half a serving and increase gradually to a full serving, as tolerated. You can also increase the amount of calories by adding other ingredients such as nuts, nut butters, seeds, and/or fruits.