OPTIMUM NUTRITION SERIOUS MASS 5.45 kg
Putting on mass has never been so easy with Optimum Nutrition Serious Mass. This weight gainer powder contains a whopping 1,250 calories per serving, with 2 massive 167g scoops packing 50g of blended protein including Whey Concentrate and Isolates, as well as casein and egg proteins. Plus over 250g of carbohydrates, no added sugar, as well as creatine, glutamine and glutamic acid to support strength and recovery, look no further if you want to take your muscle building to the next level. Plus with as little as 7g of fat and enhanced with 25 vitamins and minerals, you can forget dirty bulking to increasing your calorie intake, and reach for a tub of Optimum Nutrition Serious Mass instead, to flood your body with muscle building nutrients capable of sky-rocketing your daily intake of proteins and carbohydrates. Available in Banana, Vanilla and Chocolate, prepare for one of the most delicious and best textured shakes on the market. Don’t forget to mix with low fat milk to step up your calorie game to the next level!
Putting on mass has never been so easy with Optimum Nutrition Serious Mass. This weight gainer powder contains a whopping 1,250 calories per serving, with 2 massive 167g scoops packing 50g of blended protein including Whey Concentrate and Isolates, as well as casein and egg proteins. Plus over 250g of carbohydrates, no added sugar, as well as creatine, glutamine and glutamic acid to support strength and recovery, look no further if you want to take your muscle building to the next level. Plus with as little as 7g of fat and enhanced with 25 vitamins and minerals, you can forget dirty bulking to increasing your calorie intake, and reach for a tub of Optimum Nutrition Serious Mass instead, to flood your body with muscle building nutrients capable of sky-rocketing your daily intake of proteins and carbohydrates. Available in Banana, Vanilla and Chocolate, prepare for one of the most delicious and best textured shakes on the market. Don’t forget to mix with low fat milk to step up your calorie game to the next level!
Putting on mass has never been so easy with Optimum Nutrition Serious Mass. This weight gainer powder contains a whopping 1,250 calories per serving, with 2 massive 167g scoops packing 50g of blended protein including Whey Concentrate and Isolates, as well as casein and egg proteins. Plus over 250g of carbohydrates, no added sugar, as well as creatine, glutamine and glutamic acid to support strength and recovery, look no further if you want to take your muscle building to the next level. Plus with as little as 7g of fat and enhanced with 25 vitamins and minerals, you can forget dirty bulking to increasing your calorie intake, and reach for a tub of Optimum Nutrition Serious Mass instead, to flood your body with muscle building nutrients capable of sky-rocketing your daily intake of proteins and carbohydrates. Available in Banana, Vanilla and Chocolate, prepare for one of the most delicious and best textured shakes on the market. Don’t forget to mix with low fat milk to step up your calorie game to the next level!
Putting on mass has never been so easy with Optimum Nutrition Serious Mass. This weight gainer powder contains a whopping 1,250 calories per serving, with 2 massive 167g scoops packing 50g of blended protein including Whey Concentrate and Isolates, as well as casein and egg proteins. Plus over 250g of carbohydrates, no added sugar, as well as creatine, glutamine and glutamic acid to support strength and recovery, look no further if you want to take your muscle building to the next level. Plus with as little as 7g of fat and enhanced with 25 vitamins and minerals, you can forget dirty bulking to increasing your calorie intake, and reach for a tub of Optimum Nutrition Serious Mass instead, to flood your body with muscle building nutrients capable of sky-rocketing your daily intake of proteins and carbohydrates. Available in Banana, Vanilla and Chocolate, prepare for one of the most delicious and best textured shakes on the market. Don’t forget to mix with low fat milk to step up your calorie game to the next level!
in 24 offers
The lowest price for OPTIMUM NUTRITION SERIOUS MASS 5.45 kg right now is $88.00 at Ubuy Australia, compared across 16 retailers.
The all-time low was $69.95 on 12 Oct 2025 — today's price is 26% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 8 Nov 2026.
Last updated at 08/11/2026 05:59:18
Optimum Nutrition Serious Mass Powder 12Lbs, Strawberry Flavour, High-Calorie Mass Gainer Protein, Supports Muscle Building and Weight Gain Goals
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Optimum Nutrition, Serious Mass, 50 g Protein Powder, Strawberry, 12 lb, 16 Servings
Delivery between 12–16 Nov $41
Serious Mass by Optimum Nutrition | High-Calorie Weight Gainer 12lb / Chocolate
Delivery between 12–17 Nov $14.95
On Serious Mass 5.44 Kg Strawberry
Delivery between 11–19 Nov $10
Optimum Nutrition Serious Mass Gainer, 5.44kg / Strawberry
Delivery between 12–20 Nov $15.95
Serious Mass by Optimum Nutrition 12LB - 5.45KG / CHOCOLATE
Delivery between 12–19 Nov $5
Optimum Nutrition Serious Mass - 12lbs Strawberry
Delivery $128.99
OPTIMUM NUTRITION SERIOUS MASS - 5.44kg / VANILLA
Delivery between 11–19 Nov $10
Optimum Nutrition Serious Mass
Free delivery
Serious Mass by Optimum Nutrition Strawberry 12LB
Free delivery
originally posted on elitesupps.com.au
I enjoyed the taste and flavour of the Serious Mass Supplement, and it helped with reaching my calories. The only thing I felt which was a disappoint was just not enough servings overall, and for the price you pay for the amount of servings you get, it didn't feel worth it. But I think from time to time, and you have some money to spare this is a great supplement for sure for those extra needed calories.
originally posted on elitesupps.com.au
So I tried the vanilla one of this before, and since it was so good, I just HAD to get another one, so I got the banana. YET ANOTHER amazing flavour, it mixes really well with anything, goes down well and is great for any time of day or night. The banana flavour does not taste like an artificial banana flavour, which makes this flavour even better. Also, I love how it has a lot of protein in it, so great to build muscle and for muscle recovery too. I only ever buy the 5.4kg packet of these now, and so easy to store, open and close too.
originally posted on sprintfit.co.nz
I've tried a few different mass gainers and this has got to be my favorite. Great taste and mixes well. I only use half a serve a day which has about 600 calories, 25g protein and over 100g of carbs, which is a bit higher than some of the other mass gainers I have tried. This product also doesn't upset my sensitive stomach, which was an issue with some other mass gainers. Will be sticking to this one!
| protein | 50g |
| carbs | 254g |
| sugars | 20g |
| fibre | 4g |
| total-fats | 4.5g |
Optimum Nutrition Serious Mass Powder 12Lbs, Strawberry Flavour, High-Calorie Mass Gainer Protein, Supports Muscle Building and Weight Gain Goals
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Optimum Nutrition, Serious Mass, 50 g Protein Powder, Strawberry, 12 lb, 16 Servings
Delivery between 12–16 Nov $41
Serious Mass by Optimum Nutrition | High-Calorie Weight Gainer 12lb / Chocolate
Delivery between 12–17 Nov $14.95
On Serious Mass 5.44 Kg Strawberry
Delivery between 11–19 Nov $10
Optimum Nutrition Serious Mass Gainer, 5.44kg / Strawberry
Delivery between 12–20 Nov $15.95
I enjoyed the taste and flavour of the Serious Mass Supplement, and it helped with reaching my calories. The only thing I felt which was a disappoint was just not enough servings overall, and for the price you pay for the amount of servings you get, it didn't feel worth it. But I think from time to time, and you have some money to spare this is a great supplement for sure for those extra needed calories.
So I tried the vanilla one of this before, and since it was so good, I just HAD to get another one, so I got the banana. YET ANOTHER amazing flavour, it mixes really well with anything, goes down well and is great for any time of day or night. The banana flavour does not taste like an artificial banana flavour, which makes this flavour even better. Also, I love how it has a lot of protein in it, so great to build muscle and for muscle recovery too. I only ever buy the 5.4kg packet of these now, and so easy to store, open and close too.
I've tried a few different mass gainers and this has got to be my favorite. Great taste and mixes well. I only use half a serve a day which has about 600 calories, 25g protein and over 100g of carbs, which is a bit higher than some of the other mass gainers I have tried. This product also doesn't upset my sensitive stomach, which was an issue with some other mass gainers. Will be sticking to this one!
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.
Serious mass has 100% helped me put on weight. As a naturally skinny guy it has definitely helped boost my calories to ensure I reach a caloric surplus. It’s super convenient for on the go and I’ve found it best mixed with calci+ milk or almond milk for a lighter consistency. Chocolate flavor all the way.
I did not have much hope in gaining weight but only after 3 days ive put on 3kgs, not only does it work but the taste is sensational! by far the best supplement ive tasted ever.
Cannot go wrong with the classic. One scoop, and training four days/week really helped me gain 10kg in 4 months. I’m naturally a skinny guy, and eat only twice a day. Adding this into my diet really allowed me to reach my fitness goals.
I've tried some different gainers an I would always find I'd have to add things to make it taste good, I decided to try optimum nutritions serious mass, i got the vanilla flavour and WOW!! Don't have to add a thing! It tastes amazing, easy to get down as ive struggled with others. Mixes perfect. Packed with the goods! By far the best ive tried. I will be sticking with it for sure! Thanks NzMuscle
The product was good, unfortunately the Strawberry flavour it doesn’t suit with my taste buds. I only tried it once in a half serving and as soon as I smelled it I became hesitate to try it; however, I still drink it thinking it’s just the smell and the taste will be great but it doesn’t taste like strawberry at all for me it’s like I’m drinking some sort of chemical or medication. But will definitely try a different flavour.
| protein | 50g |
| carbs | 254g |
| sugars | 20g |
| fibre | 4g |
| total-fats | 4.5g |
