Optimum Nutrition Serious Mass 2.73kg Chocolate Peanut Butter

For a complete and accurate list of ingredients, please refer to the packaging or the official Optimum Nutrition product information, as specific ingredient details are not provided with this product listing.

Mix one serving (334g) with water or milk and consume as a meal replacement or post-workout shake. Can be consumed multiple times daily to support calorie and protein intake goals.

Optimum Nutrition Serious Mass is a weight gainer protein powder supplied in a 2.73kg container with a chocolate peanut butter flavour. This mass gainer formula is designed to deliver substantial calories and protein per serving to support muscle building and weight gain objectives.