ON Serious Mass Gainer, High Protein High Calorie Weight Gainer 5KG - Chocolate

Optimum Nutrition (ON) Serious Mass High Protein High Calorie Weight Gainer Powder is the ultimate weight gain and muscle building formula. With +1200 calories per 2-scoop serving and 50 grams of protein to support muscle recovery, this powder makes the ideal post-workout and between meals shake for sizing up your goals. Serious Mass provides you with the tools you need to support your weight gain goals.



  • Protein supplement powder with a weight gainer formula
  • Contains 24 minerals and vitamins, and high calorie content
  • Includes 1,251 calories and 50 grams of protein
  • Helps in supporting weight gain and faster muscle recovery
  • Can be used post-workout, between meals and before sleep
  • GMP approved
  • Available in a delicious chocolate flavour

About the Brand: Optimum Nutrition, Inc. (ON) is part of the Glanbia Global Nutrition Group and has been setting the Gold Standard in sports nutrition for more than 30 years – helping performance focused athletes achieve their goals. From the very beginning in 1986, Optimum Nutrition has always taken a hands-on approach to maintaining the very highest standards of quality. With a history in innovation, the brand is the pioneer in Gold Standard 100% Whey. It has also created the slowly digesting protein category with Gold Standard 100% Casein. ON has very strict regulations about ingredients selection, quality control, lab testing and manufacturing processes so you always get the highest quality sports nutrition products available. All products are manufactured at Good Manufacturing Practices (cGMPs) compliant facilities, which are GMP Registered and GMP for Sport by NSF.


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