Hover/Touch To Zoom

Supplements Since 2004 Supplements Since 2004

TRUSTED STORE SINCE 2004 Free Fast Shipping $150+

Brick-And-Mortar Store Locations Across Australia Australian Store Locations

FREE 30 SERVE PRE-WORKOUT
FREE 30 SERVE PRE-WORKOUT

Purchase any 5.45kg or 10.9kg Serious Mass & get a free 30 Serve Blueberry Lemonade Pre-Workout.

Optimum Serious Mass
Free Gift
Serious Mass
Powered By: Optimum Nutrition

High Calorie Gainer to Support Serious Mass

  • Massive 1250 Calories per Serve
  • 50 Grams of Quality Protein, Derived from 4 Different Protein Sources
  • Complete Meal Replacement with 25 Vitamins & Minerals
  • Made in a GMP Compliant U.S Facility, Strictest Quality Control

 

In Stock
(109)
Write a review
Product
Q&A's
Related Articles
Reviews
Add To Cart

Optimum Nutrition Serious Mass supplies the tools you need with a whooping 1250 calories per serve, 50 grams of protein, 250-plus grams of carbohydrates and 25 vitamins & minerals. Serious Mass can be used at any time including as a meal replacement or post-workout to increase your quality calorie intake. When used in conjunction with a healthy, balanced diet and regular weight training program, this powdered mix provides you with serious nutritional support to achieve your goals.

Nutrition & Benefits

  • 1,250 calories per serve to add additional calories that may aid weight gain and muscle building
  • 50 grams of protein per serve to help build a muscular physique
  • 252-254 grams of carbohydrates (with zero added sugars) to help fuel workouts whilst replenishing glycogen levels
  • 3g creatine monohydrate to support size and strength when combined with regular resistance training
  • 20 added vitamins and minerals including L- Glutamine to support overall health
  • Enjoy post-work-out or in-between regular meals

Serious Mass Flavours

There's no doubt that ON Serious Mass is one of the best-tasting Mass Gainers on the market. Available in a choice of Chocolate, Vanilla, Strawberry or Banana there is sure to be a flavour that suits the taste buds of every individual. 

Serious Mass Sizes

At Mr Supplement we offer more sizes of Optimum Serious Mass than you could possibly want including 2.72kg (6lb), 5.45kg (12lb) or 10.9kg (24lb). So whether you're a beginner looking to sample a smaller amount or, an experienced ON Serious Mass user wanting something larger. We have a wide range of size options & choices for everyone.

Optimum Nutrition True Strength

True Strength™ is a journey. It never rests, it never quits. It's about overcoming obstacles, accomplishing goals, and recognizing achievements. And then it resets to achieve again. As your trusted sports nutrition partner, ON demonstrates that same passion while crafting products. From the raw materials, we source to our state-of-the-art manufacturing processes, no compromises are made. You set the bar higher after every workout, we set the bar higher to redefine the industry standards and ensure you realize optimum results.

Consistency & Quality

Optimum Nutrition has been spotting the efforts of goal-driven individuals since 1986. As one of the few companies to operate state-of-the-art manufacturing facilities that are GMP compliant, ON assures that every shake will mix up effortlessly because of its first-to-market instantiation process. You also expect each shake to taste the same as the last. That's the kind of consistency ON delivers.

Q&A's
Ask a question about
Optimum Serious Mass
*
Name
*
Email Address
Submit
  • How much protein and carbohydrates are there per serve in Serious Mass?

    Per single scoop of Serious Mass there is 25g of protein and 127g of carbohydrates.

  • How many calories are there per scoop in Serious Mass?

    There are 625 calories per scoop of Optimum Serious Mass. Two scoops would be 1250 calories.

  • Is one scoop of Serious Mass enough?

    One scoop may be enough for many Serious Mass users. This equates to a 168g serving size which is still allot of powder to mix and consume. In comparison a standard serve of Optimum Gold Standard protein is only 30g. For those though that are true hard-gainers they should strive to take the full 2 scoop sizes. Whether you take a single or double scoop of Serious Mass as a rule one should attempt to consume 672-1344g of powder daily.

  • How do you use Serious Mass for best results?

    For best results take Optimum Nutrition Serious Mass 2-5 times with water daily using the full serving size of 336g which is 2 scoops. Importantly it should be taken in excess of your regular diet which shall increase your calorie count. On workout days we recommend taking one serving 30 minutes post workout. Combining Serious Mass with a regular workout program and healthy diet shall greatly assist.

  • Is Serious Mass suitable for women?

    Yes it is. Women seeking to add size or strength can take Serious Mass. Bear in mind it does contain creatine and as such may have an anti-diuretic effect (you may hold some water). It is however suitable for women to take.

  • Is Optimum Serious Mass Gluten Free?

    No it is not gluten free. Until around 2021 Serious Mass contained glutamine peptides that were listed on the label as containing wheat. Since then the glutamine peptides have been removed from the formula. However the packaging still does NOT state Serious Mass to be gluten free. If Serious Mass were gluten free we would expect Optimum Nutrition to state this on the packaging as they do with their gold standard whey range.

  • Does Serious Mass contain artificial flavours?

    Yes it does. As stated on the label Serious Mass contains both natural and artificial flavours.

  • Does Serious Mass contain creatine?

    Yes. Optimum Serious Mass contains 3g of creatine monohydrate per 336g serving. As such a separate creatine supplement would not be needed whilst taking Serious Mass.

  • What flavours are Optimum Serious Mass available in?

    Serious Mass is available in 4 flavours. Banana, Chocolate, Strawberry and Vanilla. Chocolate flavour is the #1 seller in Australia making up around half of all Serious Mass sales.

  • Can Serious Mass make me sleepy?

    Yes it can. Being high in carbohydrates Serious Mass can make you a little sleepy in the same way a high carbohydrate meal may.

  • Is Serious Mass good for skinny guys?

    Yes. Optimum Serious Mass is an excellent mass gainer for skinny guys or those who find it challenging to put on weight. By providing a high amount of calories it shall help skinny or lean guys add size.

  • Can I take Optimum Serious Mass without working out?

    Yes you can. Serious Mass is a food supplement that shall provide extra calories for anyone looking to add weight. It is commonly used by individuals who are also weight training however this is not a prerequisite.

  • Are there negative side effects from taking Serious Mass?

    No negative side effects would be expected from taking Optimum Serious Mass. After many years of selling Serious Mass to the Australian consumer the only negative side effect we have heard of is stomach cramping or difficulty digesting Serious Mass. The cause in most people seems to be due to the large serving size which is in excess of 336g. This is a very large serving. However once users reduce this serving size to 50% or 25% digestive difficulties mostly dissipate.

  • How fast does Serious Mass work?

    Serious Mass begins working immediately by adding calories in the form of carbs, protein and fats to your diet. Consumed in addition to your regular diet many users shall notice a gain in size in as little as one week.

  • Any advice on taking Serious Mass? I find it hard to stomach that much in one shake.

    Although Serious Mass is recommended to be taken at its 2 scoop serve (1200 calories) I would highly recommend halving this. Since it gives 50g of protein per 1200 calories, half serve would still suffice as it would contain 25g of protein (your average amount in a post-workout shake). This allows the body to only have to digest 600 calories - however if done twice a day this still adds 1200 calories to your daily calorie intake.

  • Will Serious Mass make me fat?

    Serious Mass does contain a large amount of calories per serve and is recommended for what is referred to as "hard gainers" meaning those with fast metabolisms that struggle to put on weight of any size. Serious Mass is a perfect addition to a calorie rich diet for hard gainers to put on size, however those with slower metabolisms may see excess body fat alongside the muscle they put in. This all depends on your diet, training and genetics just as much as the product itself. Your overall diet will determine your weight gain - this product is a part of that diet.

  • How many calories are there in a serve of Serious Mass?

    One serving of Serious Mass will give you 1250 calories, 50g of that being protein. It is one of the higher calorie shakes on the market.

  • How many times a day should I take Serious Mass?

    Exceeding the 1250 calories in liquid form may be in excess, so if you are looking to take this twice in one day, we would recommend halving the serving size giving you approximately 600 calories per shake twice a day.

  • Is Serious Mass ASADA approved?

    No Serious Mass is NOT ASADA approved.

  • How many times a day should I take Serious Mass?

    How much you take is dependant on your body type and diet. Have at least one full serve per day if you find that you struggle to put on weight. Otherwise you can have half a serve per day.

  • Does Serious Mass contain the same aminos as Gold Standard Whey?

    Optimum Serious Mass shall NOT contain the concentration of Aminos that Optimum 100% Whey Gold Standard shall contain.

Related Articles
Reviews
Optimum Serious Mass
Great
Based on reviews collected by
&
Summary Of Reviews
Optimum Serious Mass is a well-valued product with effective results in weight gain. The product is praised for its taste, especially the chocolate flavor, and its ability to blend well with other ingredients. However, some users find the texture too thick and the taste too sweet.
✔️
Tasty, especially the chocolate flavor
✔️
Effective for weight gain
✔️
Blends well with other ingredients
Summary generated automatically from the text of customer reviews.
Write a review
*
Product:
*
Rating
*
Name
*
Email
*
Review
0
/
5000 (Minimum: 75)
Submit Review
Berkun A
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
All good!!
Collected via Trustpilot
05/05/2024
Ashton C
Optimum Serious Mass
5.45kg / 16 Serves Strawberry + FREE 30 SERVE GOLD STANDARD PRE
Great value
Collected via Trustpilot
06/04/2024
Aarati P
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
Tastes yum and it's very light. The chocolate flavour is not very sweet which I like - easy to drink.
Collected via Trustpilot
16/12/2023
Mr J M
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
Great tasting on it's own. Easy to blend also. Carbs are an essential fuel. I use both pre and post work out. And prior to sport.
Collected via Trustpilot
06/02/2023
Morteza R
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
Great product
Collected via Trustpilot
10/11/2022
Ajsan A
Optimum Serious Mass
10.90kg / 32 Serves Strawberry + FREE 30 SERVE GOLD STANDARD PRE
Tasty with the combo I blend it with, greek yoghurt, honey, banana, assorted nuts and flax seeds.
Collected via Trustpilot
01/08/2022
Stuart S
Optimum Serious Mass
5.45kg / 16 Serves Banana + FREE 30 SERVE GOLD STANDARD PRE
Ordered banana and got chocolate
Collected via Trustpilot
26/03/2022
Leslie G
Optimum Serious Mass
5.45kg / 16 Serves Vanilla + FREE 30 SERVE GOLD STANDARD PRE
perfect product like mr supplement.
Collected via Trustpilot
16/01/2022
Leslie G
Optimum Serious Mass
5.45kg / 16 Serves Banana + FREE 30 SERVE GOLD STANDARD PRE
Perfect product like mr supplement,
Collected via Trustpilot
06/12/2021
Adam J
Optimum Serious Mass
5.45kg / 16 Serves Vanilla + FREE 30 SERVE GOLD STANDARD PRE
Really good product, I started off with half serve and already noticed the difference in the few weeks of using it.
I think the full serves are to thick so Instead of 3 serves a day I'll have 5-6 half serves and its perfect👌🏻.
Collected via Trustpilot
13/11/2021
Parker S
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
Very good, fast delivery
Collected via Trustpilot
06/09/2021
Bhavya D
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
On time, love the product.
Collected via Trustpilot
05/09/2021
Samson L
Optimum Serious Mass
Really good taste, just little bit too sweet ; it works better if blend with banana , peanut butter.
23/08/2021
Michael John S
Optimum Serious Mass
5.45kg / 16 Serves Banana + FREE 30 SERVE GOLD STANDARD PRE
If you want mass and are prepared to balance a good diet with plenty of cardio. This product will help you gain. The hard part is smashing 3 full shakes a day and 5 medium meals.
Good luck..
Collected via Trustpilot
21/05/2021
Leslie G
Optimum Serious Mass
5.45kg / 16 Serves Banana + FREE 30 SERVE GOLD STANDARD PRE
Perfect product.
Collected via Trustpilot
16/03/2021
Kristopher E
Optimum Serious Mass
This is an excellent product. Coronavirus has interfered with my gym training more than I would want, but it has been great to have this product at my disposal to make life that little bit easier. Lovely taste and the convenience for getting my calorie intake up is second to none.
15/03/2021
Mel G
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
Really good does what it says and in my option best on the market atm
Collected via Trustpilot
22/01/2021
Dafalla D
Optimum Serious Mass
5.45kg / 16 Serves Strawberry + FREE 30 SERVE GOLD STANDARD PRE
Very good ats working for me
Thanks
Collected via Trustpilot
17/01/2021
Joey S
Optimum Serious Mass
5.45kg / 16 Serves Vanilla + FREE 30 SERVE GOLD STANDARD PRE
Received within the week. Good product.
Collected via Trustpilot
15/11/2020
Hunter P
Optimum Serious Mass
The product is great but mixing 2 scoops in a regular shaker is a bit too thick to drink. This flavour was ok but definetly not what I expected. Overall I give this product 3 stars as the taste and consistancy arnt quite there. I will say this is a great product for bulking and really, really helps getting those extra calories and protein in!!!.
Collected via Trustpilot
03/11/2020
Tony H
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
Down 2 stars simply because the bag arrived with a huge tear in it! but the product? It works! I was sitting at 81kg and plateaued in my weight gain I'm now sitting just under 90kg... and that's using half servings at 625 calories per serve.
Collected via Trustpilot
01/11/2020
Aaron C
Optimum Serious Mass
2.7kg / 8 Serves Vanilla
Great product, would highly recommend@
Collected via Trustpilot
27/10/2020
Callum G
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
Yummy shtuffs
Collected via Trustpilot
14/10/2020
Leslie G
Optimum Serious Mass
5.45kg / 16 Serves Vanilla + FREE 30 SERVE GOLD STANDARD PRE
This product is perfect.
Collected via Trustpilot
04/10/2020
Mitchell B
Optimum Serious Mass
2.7kg / 8 Serves Chocolate
Great product, with great taste and results. Although it doesn’t mix the best
24/08/2020
Abdllahi H
Optimum Serious Mass
2.7kg / 8 Serves Vanilla
Reasonable but I’m still searching. could Not find perfect 1 but so far this 1 comes on top what I had in the passed ( happy)
Collected via Trustpilot
07/08/2020
Mark O
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
Love the taste and mixes well with water or milk
Collected via Trustpilot
19/07/2020
Callum G
Optimum Serious Mass
5.45kg / 16 Serves Chocolate + FREE 30 SERVE GOLD STANDARD PRE
Great stuff
Collected via Trustpilot
18/07/2020
Leslie G
Optimum Serious Mass
5.45kg / 16 Serves Banana + FREE 30 SERVE GOLD STANDARD PRE
This product is awesome.
Collected via Trustpilot
04/07/2020
Leslie G
Optimum Serious Mass
This product is awesome.
Collected via Trustpilot
04/07/2020
Next Page
Contact Us
↑   Back To Top   ↑