Optimum Nutrition Strength & Endurance Bundle – 12lb Serious Mass + Pre-Workout for Muscle Building

Name: Optimum Nutrition Strength &amp; Endurance Bundle - 12lb Serious Mass + Pre-Workout for Muscle Building
SKU: optimumnutritionargentina-350
Availability: InStock

$397.33

Enhance your workouts with this Optimum Nutrition bundle featuring 12lb Serious Mass for muscle growth and 30 servings of Pre-Workout for energy and focus.

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SKU: optimumnutritionargentina-350 Category: Bundles

Description

Serious Mass (12lbs): 1,250 calories, 50g protein, 252-254g carbohydrates per serving for muscle building and weight gain
GOLD STANDARD(R) Pre-Workout (30 servings): 175mg caffeine, 3g creatine monohydrate, 1.5g beta-alanine for energy and focus
Complete pre- and post-workout nutrition solution for maximum performance and recovery

Product Overview

Maximize your workout potential with the Optimum Nutrition Mass Stack XL Bundle. This powerful combination includes 12lbs of Serious Mass for post-workout recovery and muscle growth, plus 30 servings of GOLD STANDARD Pre-Workout for enhanced energy, focus, and performance. Perfect for athletes and fitness enthusiasts looking to build muscle and improve endurance.

Benefits

Serious Mass supports muscle building and weight gain with high-calorie, protein-rich formula
Pre-Workout powder delivers energy, focus, and performance enhancement for intense training
Complete workout nutrition system for pre- and post-exercise support

Additional information

Flavour	Banana, Chocolate, Chocolate Peanut Butter, Strawberry, Vanilla

1 review for Optimum Nutrition Strength & Endurance Bundle – 12lb Serious Mass + Pre-Workout for Muscle Building

Rated 4 out of 5

FitAndBrewing – November 10, 2025

I’ve been using this bundle for two months now. The Serious Mass definitely helps me hit my calorie goals, though I wish the chocolate flavor tasted less artificial. The pre-workout gives me solid energy without jitters, which is great for early morning sessions. Comparing nuggets vs heat, the pre-workout’s 175mg caffeine is more consistent than my old coffee routine. Good value for the quantity.