Optimum Nutrition
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Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
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Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Serious Mass is the ultimate formula for muscle building and weight gain.
Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary
Item #: 60860298

Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings,

90% of respondents would recommend this to a friend

Sustainability Highlights 1 Sustainability Highlights
Item #: 60860298

XCD 381

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Order now and get it around Monday, September 21
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What Stands Out

High-Calorie Formula
Packed with 1,250 calories per serving, this mass gainer is designed to help users achieve their weight gain goals quickly and efficiently.
Nutrient-Rich Blend
Enriched with vitamins, creatine, and glutamine, this protein powder supports muscle recovery and overall health, making it a complete solution for serious athletes.
Delicious Flavor
The chocolate peanut butter flavor delivers a delicious taste experience while providing essential nutrients, appealing to both fitness enthusiasts and casual users alike.

Product Details

Shop Optimum Nutrition Serious Mass Protein Powder High Calorie Mass Gainer with Vitamins, Creatine and Glutamine, Chocolate Peanut Butter, 16 Servings, 5.45 kg, Packaging May Vary online at a best price in Saint Lucia. B015WMRVKW
  • Low fat mass gainer with over 1250 CALORIES and 50g of PROTEIN per serving
  • Contains 3 grams of CREATINE MONOHYDRATE to support performance
  • No added sugar protein powder formula with 25 vitamins and minerals
  • Less than 5g fat per serving and over 250 grams of CARBOHYDRATES
  • Comes in 6 flavours: banana, chocolate peanut butter, chocolate, cookies & cream, strawberry, and vanilla
  • Quick and easy to prepare by mixing 2 scoops with 710 ml of water or plant milk
FlavourChocolate Peanut Butter
Diet TypeVegetarian
BenefitsMuscle Growth, Weight Gain
Protein15 g
Vitamins And Minerals0.3 g
Brand NameOptimum Nutrition
Package Type NameTub
Age Range DescriptionAdult
Model NameSerious Mass 5.45kg
Global Trade Identification Number05060245607650
Country Of OriginUnited Kingdom
Manufacturer Contact Information4 Waterside, Dublin 24, Ireland
ManufacturerOptimum Nutrition
Model Number1101534
Manufacturer Part Number1101534
Item Weight5.45 Kilograms
Item Dimensions30 x 14 x 42 centimetres
Total Servings Per Container16
Unit Count5450.0 gram
Number of Items1
Net Content Volume13.88 Litres
Allergen InformationContains: Egg may contain, Gluten may contain, Milk, Peanuts may contain, Soy, Tree nuts may contain
Material Type FreeSugar Free
BrandOptimum Nutrition
Servings per container16
Product benefitsMuscle Growth, Weight Gain
Package typeTub

Who Should Buy?

Suitable For
  • Hardgainers

    Ideal for individuals struggling to gain weight despite regular dietary intake, providing high calories per serving.

  • Intense Athletes

    Beneficial for athletes needing additional nutrition post-workout to support recovery and muscle growth from intense training.

  • Busy Individuals

    Convenient option for those with tight schedules, offering an easy way to ensure high calorie intake through shakes.

Not Suitable For
  • Weight Watchers

    Not suitable for those trying to lose weight, as its high calorie content can hinder weight loss efforts.

Product Description

Dietary Supplement Disclaimer

Statements regarding dietary supplements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease or health condition.


Sustainability Highlights

This product has sustainability features recognized by trusted certifications.

Packaging efficiency

Reduced air and/or water in the product or packaging for more efficient transportation. As certified by

[Amazon-developed Certification] Compact by Design identifies products that, while they may not always look very different, have a more efficient design. By reducing water and/or air in the product or packaging, these become more efficient to ship. At scale, these small differences in product size and weight can lead to carbon emission reductions. Learn more about this certification

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Customer Questions & Answers

  • Question: How should I take Serious Mass?

    Answer: Mix 2 heaped measuring spoons with 710 ml of water or plant milk.
  • Question: Can I use Serious Mass after workouts?

    Answer: Yes, it's ideal after intense exercise or between meals.
  • Question: Is Serious Mass suitable for all athletes?

    Answer: Yes, it's designed for performance-oriented athletes looking to gain muscle and weight.

Optimum Nutrition Whey Proteins 1101534 Editorial Review

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Optimum Nutrition Serious Mass Protein Powder is a high-calorie mass gainer supplement that is enriched with vitamins, creatine, and glutamine. It is perfect for people who have a hard time gaining weight and can also be used as a meal replacement. It is recommended to Consume it with 1200 calories with water or 1600 calories with whole milk. The product is suitable for vegetarians but not for vegans. The value for money is commented on positively in most of the reviews. It's beneficial for people who want to gain weight, and some even say it helps build muscle. The chocolate peanut butter flavor is quite popular but not the taste in general as mentioned in a review. However, some customers have encountered packaging issues such as holes and splits in the bag which can waste the product. One review also states that despite the good results from the product, the price increase was too high to justify buying it again. Overall, the Optimum Nutrition Serious Mass Protein Powder can be recommended for those who want to gain weight. However, customers should be aware of the packaging issues and Consider the high price point.

Customer Reviews & Ratings

990 customers ratings
  • 5 Star
    73%
  • 4 Star
    14%
  • 3 Star
    6%
  • 2 Star
    1%
  • 1 Star
    6%

Review this product

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Pros

  • Helps with weight gain and muscle building
  • Suitable for vegetarians
  • Chocolate peanut butter flavor is popular
  • Good value for money

Cons

  • Taste is not universally liked

Platform Trust & Buyer Confidence

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4.2/5 9477 reviews
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Jasmin
Verified buyer

“Great products and very good service: very easy and very fast international delivery.”

9 September 2026 · via Trustpilot
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Anke
Verified buyer

“Wonderful online shopping experience, smooth transaction from the start. Payment method works conveniently and delivery is unexpectedly fast and reliable. You go the extra mile for service. What makes this even more amazing, you deliver to Namibia. I will remain a happy Ubuy customer and will increase my purchases for sure! Thank you!”

10 September 2026 · via Trustpilot
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Hazel
Verified buyer

“Very easy to find the products what you need, and so fast delivery, that’s why I highly recommended to others costumers to used ubuy.”

10 September 2026 · via Trustpilot
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Opaleye
Verified buyer

“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”

11 September 2026 · via Trustpilot
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Adele
Verified buyer

“Easy to find and order what you want on the website. Delivery is quick to the UK”

8 September 2026 · via Trustpilot
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Important information

  • Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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XCD 381

Order now and get it around Monday, September 21

QTY:

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Features & Benefits

  • High-calorie protein powder with over 1,250 calories per serving.
  • Contains 50 grams of protein to support muscle growth.
  • Enriched with 3 grams of creatine monohydrate for improved performance.
  • Includes 25 essential vitamins and minerals for overall health.
  • Fast and convenient; just mix with water or plant milk.
  • Available in 6 delicious flavors to suit every taste.

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