ON (Optimum Nutrition) Serious Mass

Optimum Nutrition Serious Mass – Ultimate Weight Gainer
Serious Mass by Optimum Nutrition is a high-calorie, high-protein mass gainer formulated to support rapid weight gain and muscle building. With over 1200 calories per serving, it’s ideal for those struggling to meet their daily energy needs through food alone.

High-Calorie, High-Protein Formula
Each 2-scoop serving delivers 1200+ calories and 50g of protein to support muscle recovery and growth. It’s the perfect fuel for post-workout recovery or to bridge the gap between meals.

Designed for Hard Gainers
Perfect for individuals with fast metabolisms or high energy demands who find it difficult to gain weight through regular meals. Also ideal for athletes with intense training needs.

Trusted Ingredients & Clean Manufacturing
Made with premium whey protein isolate and concentrate sourced from Europe. Blended in a world-class Indian facility certified with NSF, FSSC 22000, and OHSAS 18001 for top-tier safety and quality.

When to Consume
Take post-workout and/or between meals to add quality calories, carbohydrates, and protein to your daily diet and accelerate mass gain goals.