Optimum Nutrition Serious Mass – Chocolate Peanut Butter – 5.44 kg (12 lbs)

Optimum Nutrition Serious Mass – Chocolate Peanut Butter – 5.44 kg (12 lbs) is a world-renowned mass gainer trusted by athletes for its calorie-dense profile. Each serving provides more than 1200 calories, 50 grams of protein, and a carbohydrate matrix for sustained energy and growth. Fortified with vitamins, minerals, creatine, and glutamine, it offers comprehensive support for recovery, performance, and overall health. The chocolate peanut butter flavor delivers an indulgent shake experience while ensuring maximum nutritional value. Serious Mass helps athletes and hard gainers overcome calorie gaps, supporting visible mass and strength improvements. It replenishes glycogen stores, enhances protein synthesis, and ensures recovery after the most demanding training sessions. Designed for consistency, it can be consumed post-workout or between meals to maintain a surplus. With its proven effectiveness, Serious Mass is the go-to solution for athletes dedicated to maximizing growth and performance.