Description
Optimum Nutrition Serious Mass is the ultimate weight gain and muscle-building formula designed for hardgainers, athletes, and individuals struggling to hit their daily caloric targets. Packing a massive 1,250 calories and 50 grams of quality protein per serving, this high-calorie gainer provides the raw firepower needed to support heavy resistance training, promote serious muscle hypertrophy, and break through stubborn weight plateaus.
Key Benefits & Features
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Massive Caloric Density: Delivers 1,250 calories per serving (when mixed with water) to make hitting extreme calorie surpluses effortless.
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High-Protein Muscle Support: Features 50g of blended protein from whey, casein, and egg sources to support muscle repair and sustained growth.
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Complex Carbohydrate Fuel: Packed with 250g+ of carbohydrates without added sugar to replenish glycogen stores and power intense gym sessions.
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Fortified with Creatine & Glutamine: Contains added Creatine Monohydrate, L-Glutamine, and Glutamine Peptides to maximize muscle strength, power, and cell recovery.
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Comprehensive Vitamin & Mineral Blend: Enhanced with 25 essential vitamins and minerals to support daily health, metabolism, and immune resilience.
How It Works
Serious Mass works by supplying a dense, highly absorbable stream of macronutrients and micronutrients that fuel anabolic muscle growth. The protein blend combines rapid, moderate, and slow-digesting protein sources (whey protein isolate/concentrate, calcium caseinate, and egg albumen). This multi-stage release delivers a sustained flow of essential amino acids into your bloodstream, keeping your body in an anabolic (muscle-building) state for hours.
The complex carbohydrate matrix rapidly restores depleted muscle glycogen levels following high-intensity training, preventing your body from burning hard-earned muscle for fuel. Additionally, the inclusion of Creatine Monohydrate helps restore ATP reserves for explosive strength, while the full spectrum of vitamins and minerals ensures efficient nutrient metabolism and cellular health.
Recommended Use
Mix 2 heaping scoops (334g) with 700ml of cold water, whole milk, or your favorite beverage in a Sprint Fit shaker or blender. Blend for 45–60 seconds until smooth. Beginners may prefer starting with a half serving (1 scoop) daily and gradually increasing to a full serving. Consume between meals, post-workout, or before bed to meet your daily caloric requirements.
Optimum Nutrition Serious Mass Frequently Asked Questions
How many calories and grams of protein are in a serving of Serious Mass?
How many calories and grams of protein are in a serving of Serious Mass? Optimum Nutrition Serious Mass is a high-calorie weight-gainer engineered to support rapid size and muscle building. Each full 2-scoop serving delivers:
Calories: 1,250+ calories when mixed with water (significantly more when blended with dairy or plant-based milk).
Protein: 50g of premium protein blend (Whey Protein Concentrate, Calcium Caseinate, and Egg Albumen) to fuel muscle repair.
Carbohydrates: 250g+ of complex carbohydrates to replenish glycogen stores and drive recovery.
What performance ingredients are added to Serious Mass?
Beyond the massive macronutrient profile, each serving is enhanced with 3g of pure Creatine Monohydrate for strength and power, alongside L-Glutamine to support muscle recovery and immune function. It also contains a comprehensive blend of 25+ essential vitamins and minerals to fulfill daily nutritional requirements.
How many servings are in the 6lb and 12lb sizes?
Because the serving size required for 1,250 calories is a substantial 336g (2 large scoops), the breakdown across the available sizes is:
6lb (2.7kg) Tub: Contains 8 full servings.
12lb (5.44kg) Bag: Contains 16 full servings (offering the absolute best long-term value for a consistent calorie surplus).
How should a beginner use Serious Mass?
If you are new to high-calorie weight gainers, we highly recommend starting with half a serving daily (1 scoop) for the first week. This allows your digestive system to adapt to the nutrient density before gradually scaling up to a full 2-scoop serving.
Can Serious Mass be used as a meal replacement?
Yes. Due to its balanced blend of slow and fast-digesting proteins, complex carbohydrates, and essential micronutrients, it serves as an excellent, time-saving, high-calorie meal replacement for busy individuals and athletes who struggle to eat enough whole foods.
Is Optimum Nutrition Serious Mass safe for drug-tested competitive athletes?
Absolutely. Serious Mass is proudly Informed-Choice certified, meaning it undergoes regular, independent testing for banned substances. Elite sports players and competitive athletes across New Zealand can consume it with total peace of mind regarding label accuracy and safety.
What is the best way to mix Serious Mass?
Due to the sheer volume of powder, using an electric blender is highly recommended over a standard shaker bottle. Mix 2 scoops with 700ml to 1 Liter of cold water or milk, and blend for 45–60 seconds. Pro-tip: Add a banana, a spoonful of peanut butter, or oats to push your shake past 1,500 calories.
How fast is delivery for Serious Mass within New Zealand?
Sprint Fit offers super-fast nationwide shipping. Orders completed before 3:45 pm, Monday through Friday, qualify for same-day warehouse dispatch. Most North Island and Auckland orders land overnight, while South Island shipments generally arrive within 1 to 2 business days.
Facts
Available Sizes:
Container Size: 2.7KG (6Lb)
Serving Size: 2 Scoop (336g)
Servings Per Container:8
Container Size: 5.44KG (12Lb)
Serving Size: 2 Scoop (336g)
Servings Per Container: 16
Please Note: Nutritional Information is to be used as a guide only, actual values may differ between flavours and sizes and when formulations are modified or updated by the manufacturer.
Contact us if you have any questions regarding this products ingredients.
Shipping
All orders $60 and over receive Free* Shipping Nationwide
Final pick up each day is at 3.45pm Monday to Friday.
Estimated Delivery Times*:
Auckland and North Island – Overnight
*During sale periods, please allow an additional 1–2 business days for dispatch due to high order volumes.
However many Auckland orders will be delivered the same day depending on what time the order is placed
South Island – Overnight (For larger parcels allow 2 business days)
Same Day/Evening Express Shipping upgrade available at checkout for select suburbs*
Click here to view the full Shipping Details and Returns Policy.
Often Bought Together
Optimum Nutrition Serious Mass Reviews
Chocolate
Best flavour and great results, have tried seal other mass gainers but this is the best and no after taste of gases/bloating. Highly recommend.Chocolate
Quite nice tasting I got the chocolate one and far better than other chocolate protein shakes I've brought easy to mix with a Shaker and doesn't get clumpy isnt too thick too which I've found with othersChocolate
Love the taste. Very easy to drink. Have only just started taking it but weight has increased already. Recovering from knee surgery so muscle performance can't be rated yet.Chocolate
Thick and creamy, the way I like it. Shipping was super fast like myself.Chocolate
I bought the chocolate flavoured and I usually mix it with milk. It easy to blend and the taste is amazing!Chocolate
One of the best tasting Mass Gainers out there. Very good pricing and next day shipping.Chocolate
Banana
Optimum serious mass chocolate has to be my favorite protein, taste like a chocolate shake, thick as a shake and very filling. And you will put size and mass on with this. Banana is a bit sweet for me personally but definitely has the Banana hit Definitely recommend for anyone and will be back for my next order.
