Optimum Nutrition·Weight Gain
Optimum Nutrition Serious Mass Gainer
Try a new flavour, worry-free. If you don't love it, we'll swap it for another flavour or give you store credit.
30 days, up to 5 serves. Full terms
A HIGH-CALORIE MASS GAINER MADE TO SUPPORT MUSCLE GROWTH, RECOVERY AND YOUR DAILY CALORIE INTAKE
- 1,250 calories per serve, with 50 g of protein and 250 g+ of carbs
- 3 g of creatine monohydrate to support strength and performance
- 19 added vitamins and minerals, plus L-glutamine
- Ideal for hard gainers or anyone with high energy needs
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Optimum Nutrition Serious Mass Gainer
Product details
On this page
Optimum Nutrition Serious Mass is a high-calorie mass gainer for people who struggle to eat enough to gain weight. One serve (2 heaping scoops, 336 g) gives you about 1,250 calories, 50 g of protein, 253 g of carbs, 3 g of creatine and 19 vitamins and minerals. Choose a 2.72 kg tub (8 serves) or a 5.44 kg tub (16 serves).
Why choose Optimum Nutrition Serious Mass
Serious Mass by Optimum Nutrition is a high-calorie weight gainer made for anyone trying to build muscle and add body weight. Every two-scoop serve packs about 1,250 calories, with 50 g of blended protein and 252 to 254 g of carbs to support muscle recovery and refill your glycogen stores. Each serve also includes 3 g of creatine monohydrate to help boost strength and power in high-intensity training.
The formula is packed with 19 added vitamins and minerals, plus L-glutamine, to back your overall health and performance. Serious Mass comes in a range of sizes and flavours, so the shake is an easy fit for people with fast metabolisms, small appetites or busy days that make getting enough calories from food alone a real challenge.
What Serious Mass helps with
- Weight gain: 1,250 calories per serve, with 50 g of protein and over 250 g of carbs.
- Strength and power: 3 g of creatine monohydrate in every serve.
- Overall health: 19 added vitamins and minerals, plus L-glutamine.
- Hard gainers: made for people with high energy needs or small appetites.
Nutrition per serve
| Nutrition | Per serve (336 g) | Per 100 g |
|---|---|---|
| Energy | 1,253 Cal (about 5,240 kJ) | 369 Cal |
| Protein | 50 g | 15 g |
| Fat | 4.5 g | 1 g |
| Saturated fat | 3 g | 0.9 g |
| Carbohydrate | 253 g | 75 g |
| Sugars | 20 g | 6 g |
| Sodium | 440 mg | 131 mg |
| Creatine monohydrate | 3 g | 0.9 g |
| L-glutamine | 1 g | 0.3 g |
Vitamins and minerals
| Vitamins and minerals | Per serve (336 g) | Per 100 g |
|---|---|---|
| Vitamin A | 375 µg | 112 µg |
| Vitamin C | 30 mg | 9 mg |
| Vitamin E | 8 mg | 2 mg |
| Thiamin (B1) | 0.3 mg | 0.1 mg |
| Riboflavin (B2) | 0.8 mg | 0.2 mg |
| Niacin | 4 mg | 1 mg |
| Vitamin B6 | 0.4 mg | 0.1 mg |
| Folic acid | 100 µg | 30 µg |
| Vitamin B12 | 1.2 µg | 0.4 µg |
| Biotin | 50 µg | 15 µg |
| Pantothenic acid | 3 mg | 0.9 mg |
| Calcium | 720 mg | 214 mg |
| Iron | 8 mg | 2 mg |
| Iodine | 23 µg | 7 µg |
| Magnesium | 220 mg | 65 mg |
| Zinc | 4 mg | 1 mg |
| Copper | 0.4 mg | 0.1 mg |
| Manganese | 1 mg | 0.3 mg |
| Potassium | 520 mg | 155 mg |
Figures are from the Serious Mass label shown on this page (Banana, 2.72 kg). Check the label on your tub.
Ingredients
Maltodextrin, protein blend (whey protein concentrate, calcium caseinate, sweet dairy whey), emulsifier (soy lecithin), flavours, creatine monohydrate, medium chain triglycerides, vitamin and mineral blend, L-glutamine, acidity regulator (330), sweeteners (sucralose, acesulfame potassium) and colour (100). Contains milk and soy.
How many calories do you need to gain weight?
To gain weight, you need to eat more calories than you burn each day. Most people aim for a few hundred extra calories a day. A full serve of Serious Mass adds about 1,250 calories, so many people start with a half serve (1 scoop, about 625 calories) and build up. Track your weight each week and adjust.
How to take Serious Mass
Blend 2 scoops into 700 to 720 ml of cold water or milk with an electric blender. Using a blender lets you add fruit, peanut butter and other foods for even more calories. New users should start with a half serve of 1 scoop. Have your shake after training and/or between meals to add calories, carbs and protein to a healthy, balanced diet.
Flavours and mixing
Banana, Chocolate and Vanilla in both sizes, plus Strawberry in the 5.44 kg tub. Serious Mass is a big serve, so a blender works best. Milk gives a thicker, creamier shake. Not sure which flavour to pick? Serious Mass is covered by our Love the Taste Guarantee. Try up to 5 serves within 30 days. If you don't love the flavour, swap for another or take store credit.
Sizes and price per serve
- 2.72 kg (8 serves): $99.95, about $12.49 a full serve.
- 5.44 kg (16 serves): $169.95, about $10.62 a full serve.
Who should take Serious Mass?
Serious Mass is a good fit for hard gainers who struggle to put on weight, people with fast metabolisms or small appetites, and anyone too busy to eat enough meals. Serious Mass is not for people trying to lose weight, people on low-carb diets, anyone under 15, or pregnant or nursing women.
Things to know before you buy
Serious Mass is very high in carbs, mostly from maltodextrin, and a full serve has more calories than most meals. Too many extra calories can add body fat as well as muscle, so pair Serious Mass with regular strength training and real food, and adjust your serve size as you go. People with diabetes or kidney problems should talk to their doctor first.
What to take with Serious Mass
- Creatine: Serious Mass already has 3 g of creatine per serve, so you may not need extra. For a half serve, you can top up with Optimum Nutrition Micronized Creatine.
- A protein snack: the EQ Food XL1000 Cal Protein Cookie adds about 1,000 calories on the go.
- Pre-workout: Faction Labs Disorder before training.
Serious Mass vs other mass gainers
- Optimum Nutrition Serious Mass: about 1,250 calories and 50 g of protein per serve, with 3 g of creatine.
- International Protein Extreme Mass: an Australian mass gainer from International Protein.
- Emrald Labs Post Mass: 634 calories per serve, a lighter gainer.
- Optimum Nutrition Gold Standard Pro Gainer: another mass gainer from Optimum Nutrition.
- Rule 1 R1 Mass Gainer: a mass gainer from Rule 1.
- Dymatize Super Mass Gainer: a mass gainer from Dymatize.
Looking for something else? Browse all mass gainers or the full Optimum Nutrition range.
Where to buy Serious Mass in Australia
Booty N Buff stocks Optimum Nutrition Serious Mass and ships Australia-wide from our store in Caringbah, NSW. Order by 2pm on a weekday for same-day dispatch.
How to use
Blend 2 scoops into 700 to 720 ml of cold water or milk using an electric blender. A blender lets you add fruit, peanut butter and other foods for extra calories.
TIP: New users should start with a half serve of 1 scoop.
Use after training and/or between meals to add calories, carbs and protein to your healthy, balanced diet.
Warnings
Keep out of reach of children. Do not use if the seal is broken. Replace the lid after use and avoid using a wet spoon or scoop. Store in a cool, dry place below 30 degrees Celsius, away from heat, moisture and direct sunlight.
Formulated supplementary sports food. Not suitable for children under 15 years of age, or pregnant or nursing women. Should only be used under medical or dietetic supervision. Talk to a licensed healthcare professional before use. This product is not a sole source of nutrition and should be used with a nutritious diet and/or a suitable physical training or exercise program. Do not exceed the recommended daily serving and stop use straight away if you have any adverse effects.
Contains milk and soy.
Optimum Nutrition Serious Mass Gainer is covered · Love the Taste Guarantee
Love the taste. Or swap it.
Try up to 5 serves of Optimum Nutrition Serious Mass Gainer within 30 days. If you don't love the flavour, bring it back and we'll swap it for another flavour, or give you store credit.
Straight answers
Common questions
Can't find your answer? Message the team or call the Caringbah store.
01How many calories are in Serious Mass?+
02How much protein is in Serious Mass?+
03How many serves are in Serious Mass?+
04Does Serious Mass have creatine?+
05How do I mix Serious Mass?+
06When should I take Serious Mass?+
07Can I take half a serve of Serious Mass?+
08Is Serious Mass good for skinny people?+
09How much sugar is in Serious Mass?+
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