Use Code REFUEL For 10% OFF!
Days
Hours
Mins
Secs
Shop now. Pay later. Always interest-free - afterpay

Back to product overview

Optimum Nutrition Serious Mass Protein Reviews

4.65/5 based on 121 reviews
5 star
(96)
4 star
(21)
3 star
(2)
2 star
(0)
1 star
(2)

Overall Rating

9.3 /10

121 Ratings

Average Flavour Rating

9.6 /10

6 Flavours

Top Rated Flavour

10 /10

Chocolate

Write Review
5/5
Serious mass has been my go mass protein. I gain weight easier and quick which i needed most
5/5
Awesome flavour. Fast arrival and awesome shaker bottle
4.5/5
Good product, lots of calories using it at a lower dose rate to make it last and to build up to full dose. Flavour is great consistency prety thick like a full on milkshake.
4/5
This Shi good as hell
5/5
Great!
5/5
Good mass protein high calorie and good protein
4/5
Great for weight gain. In a couple months I’ve gone from 57kgs to 64kgs 2 scoops with milk ???? On my 4th purchase ??
5/5
I got this for my son for his birthday at his request. He loves it! Very happy.
4/5
Great value for money, not the best tasting but still works effectivley.
5/5
Tastes so good mixes very well with milk easy to drink and doesn’t fill you up heaps so great for bulking easy was to get some extra calories in and very good if you need calories in a rush
4/5
Great supplement. Highly recommended!!
5/5
This wasn't my first purchase of this product. Ibe of the best on the market in my opinion. Wide scale of nutrients, next to no sugar, goid taste, great digestivity and you actually gain weight.
5/5
1st time purchases from this store, incredibly fast postage, good quality products, will definitely purchase again soon.
5/5
Great flavour, mixes OK in water. Just needs a bit more vigour than I expected in a shaker. Blender is fine. Noticed results in 4-6 weeks, training 4 times a week; this stuff is awesome.
5/5
Amazing flavour and texture. I take 1/4 serving as a meal replacement after a workout and it keeps me going all day.
5/5
I’ve always been a tiny girl who ate a lot but could never gain any weight. This has been a huge help for me
5/5
Very good supplement and shows result within a week. Using it for the second time. Can be consumed with or without working out..
4.5/5
Its great product if you wana put on weight
5/5
tastes amazing
5/5
I ordered on optimum nutrition mass The result is fabulous. I can see my weight is gaining with good fat taste good vanilla is good as Will get another one after this one Really recommended and sprinfit is better than other ones interns of money and quality and delivered on time as well
4.5/5
Excellent
3.5/5
Bag is so huge! Much bigger than I expected :) The scoops are massive and make protein shakes very thick and the vanilla flavour can overpower any other ingredients that I add to the shake
5/5
The chocolate is real tasty and mixes v well would recommend.
5/5
I love the flavour it's perfect
4.5/5
Great flavour. Could drink it everyday!
5/5
Such good value for money. This is a go to for us skinny guys
5/5
Works great would and taste good would recommend
5/5
Great product. Flavour is amazing not to rich and not to weak. It fills you up, but not enough so that you don’t want to eat
4/5
Amazing flavour!!
5/5
Love this protein powder. Vanilla flavour best for mixing in a smoothie after a workout.
5/5
Awesome taste, really easy to drink and doesn’t leave bloating like some other products tend to leave. Powder is super easy to mix and doesn’t leave any gritty feeling in your mouth. The strawberry flavour taste like any branded milk but can get sick let after a while.
4/5
A filling shake.
4/5
Tried a few diff mass gainers, this one is definitely on the tasty side. Easy to mix with fruit etc. Will definately buy again. I tend to bounce between this and MusclePharm Combat XL. Always the vanillas as I find them easier to mix with other flavourings...mio...
5/5
Amazing flavours have tried 3/4, easy to drink and the most mixable powder I’ve tried. Very gentle on the stomach no issues with digestion. Great powder for beginners and pro. Obviously results can vary person to person and for goals. I used to outlet gain weight and worked for me really well.
5/5
Helpful for gaining muscles
5/5
I found it difficult reaching my daily kilojoule goal with food alone, however the Serious Mass Protein has helped significantly! Tastes great and works a treat, highly recommend.
5/5
Always buy this. Very tasty flavors I love chocolate more than vanilla though. High calories good for weight gain.
5/5
Good product ! And really good size for the $$ Will deffintly be buying again
4.5/5
The serious helped me to achieve my goal ...! I was 77 kg before i started taking it and after i gained a weight upto 82 kg with a pure muscle formation ...!seriously very well ...!Thanks sprintfit for providing me such a good supplement
4/5
The serious mass works very well and the taste is awesome
4.5/5
This product was very good I gained a lot of weight compared to other products
5/5
Amazing product !!
4/5
Amazing taste recommend it
4.5/5
mmmmmmm... chocolate is my favourite.... another great product from O.N.
4/5
Great tasting supplement. I can definitely feel the difference, I don’t put on weight because I have a fast metabolism, using serious mass by optimum nutrition is helping.
5/5
Great product would highly recommend
5/5
Love this, mixes well and tastes amazing
5/5
Serious mass chocolate flavour is very delicious when mixed with minimal water to make it just thick. It gives me more energy and significant improvement in muscle mass .
4/5
A yummy mass gainer that isn't too sweet and not chunky like your typical mass gainer. Easy to consume and doesn't make you feel sick.
5/5
I love this product. The flavour, consistency, it's also great value for money!
4.5/5
Great product third time buying.
5/5
Easy to drink and has lead to some good muscle mass gain
5/5
One of the best I've tried chocolate flavor is real nice and mixes well in the shaker I got. Recommend
5/5
Best one.
5/5
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.
5/5
Good product, banana is tasty. Sprint fit are always quick with despatch/delivery
4/5
Mixed well in milk . Very quick delivery
5/5
Really great product ! Results are visible and great service delivered next working day.
5/5
Love the product. Flavours chocolate peanut butter and Vanilla are delicious! Will continue buying this product! 10/10
5/5
I highly recommend and enjoy the O.N protein powder. The consistency of the powder, the taste, and the size of the product is very well worth the price. The best protein powder I've ever used.
5/5
Great product works well for the serious
5/5
Amazing
5/5
Great product, use this very regularly and helped me put on size a lot
5/5
Perfect weight gainer struggled for years to gain weight found this and never going to look back realy works perfect if you looking for bit of extra size and healthy look highly recommend
5/5
This is the bomb protein powder, 50g of protein and heaps of flavour (chocolate). Absolutely recommend for a fantastic price too I might add.
5/5
Great taste. Excellent service always from Sprint Fit.
4/5
Good product does what it says
5/5
Awesome product, chocolate is the best
5/5
Great product. Would recommend and continue to purchase.
5/5
Good taste, does what it says
5/5
Works great
5/5
Good product. Great taste. Combined with wellbelly caps removed all side effects of discomfort
5/5
Love this protein, was gifted a full pack from a gym buddies, I've felt more gains, seen more definition in my muscles. The flavour is very tasty. I had no choice but to purchase again.
5/5
Love this protein powder. Gone through three so far, really yummy
5/5
Love this protein powder, affordable and effective with a super fast arrival :)
5/5
The product was really good and I have been taking it for a while now! Would recommend it!
5/5
Great stuff and putting on the weight. Easiest mixed with a shaker with the metal ball rather than a blender. Chocolate tastes great.
3.5/5
Great product, gets you through when you need to bulk cleanly
5/5
Damn awesome product that having recently and loving it. Also, the service is in top quality. Thanks guys
4.5/5
Product is always what you ordered, most impressed by customer service. Put in the wrong delivery address, emailed asking to change and by 6am the next morning had confirmed email change and shipped product without issues. Awesome
5/5
Exactly what I ordered and delivered fast. Good service
4.5/5
Do you like gains. Like the feeling of weights getting lighter. Then shut up and get mass gainer. Go big or....
5/5
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!
5/5
Tasty and healthy.
5/5
Awesome service with fast delivery and got 20% off discount as you guys celebrating the birthday. Thanks
4/5
Great product at a great price and sent quickly to me. Really recommend Sprint Fit for supplements.
4.5/5
Tastes great and works well
5/5
Awesome flavor, super tasty. Easy to mix or shake up with no clumps. Quality product, highly recommended
4/5
Good excellent product.
5/5
Awesome site very on time and free gift was worth it it’s price. Thanks a lot guys. Optimum Serious Mass is my go to.
.5/5
Bag come split open. I emailed about the issue and it was never resolved. very disappointed
5/5
This stuff is the best I've ever had. Tastes great, and mixes well. Highly recommend!
5/5
I think Optimum Nutrition Serious Mass protein is awesome n gain mean results with a solid workout plan and diet and also taste yum.
5/5
Nice product. Great taste. Highly recommend.
5/5
Awesome Product , Great Value, Fast shipping
5/5
Excellent service, fast delivery, great product, tastes good and blended well

Instagram sprintfit

FIND OUT BEFORE ANYONE

Receive exclusive offers and news that will brighten up your day!

Sign up successful!