Description

Optimum Nutrition Serious Mass

The Ultimate Calorie-Packed Shake

Crafted for athletes who demand serious progress, Serious Mass is the go-to weight gainer to support muscle growth, recovery, and strength. One serving delivers up to 1,260 calories, 50 g of fast-digesting protein, 250+ g of complex carbohydrates, plus 5 g creatine monohydrate — all in a shake that’s easy to blend and enjoy.

Key Benefits You’ll Actually Feel

  • Massive calorie boost — ideal for those struggling to eat enough to gain.

  • Muscle-building protein — 50 g per scoop supports lean gains and recovery.

  • High-carbohydrate fuel — 250–253 g of carbs replenish glycogen stores and power intense sessions.

  • Added creatine — 5 g included to help increase strength, power, and performance.

  • Complete micronutrient profile — a source of 19 essential vitamins and minerals to support overall health.

  • Naturally occurring glutamine, BCAAs & EAAs — supports recovery, immune function, and muscle maintenance.

How to Use

Mix 340 g (roughly two heaping scoops) with water, milk, or your favorite beverage. Blend for 30–45 seconds until smooth. For first-time users, starting with half a serving for the first week helps your digestive system adjust.

For best results, use consistently in combination with a resistance training program to maximize muscle and weight gain.

Flavor & Experience

Available in five bold flavors, Serious Mass doesn’t just deliver macros — it delivers flavor you’ll enjoy each day. Mixability is smooth, and it’s designed to be a delicious, convenient nutrition boost.

  • Supports muscle building & weight gain¹ ³
  • Helps fuel intense workouts¹
  • 1250-1260 calories per serving⁷
  • 50g protein per serving⁷
  • 250-253 carbs per serving⁷
  • 5g of creatine monohydrate per serving
  • Up to 1260 calories per serving to support calorie surplus for weight and muscle building1,7
  • 50g complete, fast-digesting protein per serving to support muscle building and recovery1,7
  • Up to 253g carbohydrates per serving to support the fueling of intense workouts and aid in replenishment of glycogen stores1,7
  • 5g creatine monohydrate to support strength, power, and performance1,3,7
  • 8g naturally occurring glutamine per serving
  • 11g branched chain amino acids (BCAAs) per serving
  • 24g essential amino acids (EAAs) per serving
  • Good source of 19 vitamins and minerals per serving7
  • Vitamins A, C, E, and zinc help support a healthy immune system¹
  • B vitamins to help convert food to cellular energy¹
  • 5 rich, delicious flavors

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