CRUNCH MUNCH - Experience the irresistible texture of Chocolate Brownie and Marshmallow Crunch varieties.
ON THE GO NUTRITION - Perfectly portioned 65g bars to keep you energized anytime, anywhere.
POWER PACKED PROTEIN - Fuel your day with 20g of muscle-supporting protein per bar.
GUILT FREE INDULGENCE - Satisfy your sweet tooth with no added sugars*—naturally delicious.
VEGETARIAN FRIENDLY FUEL - Crafted for active professionals seeking clean, plant-conscious snacking.
Optimum Nutrition Marshmallow Protein Bars deliver 20g of high-quality protein in a convenient 65g bar, featuring indulgent flavors like Chocolate Brownie and Marshmallow Crunch. With no added sugars* and vegetarian-friendly ingredients, these bars are designed for active professionals seeking a tasty, nutritious snack to power workouts and busy days.
Specifications
Product Dimensions
24 x 15.5 x 6.5 cm; 720 g
Manufacturer reference
1150066
Allergen Information
Contains: Milk, Egg may contain, Peanuts may contain, Soy, Wheat
Units
650.0 gram
Serving Recommendation
1 bar
Manufacturer contact
OPTIMUM NUTRITION: 4 Waterside, Citywest Business Campus, Dublin 24, Ireland.
Brand
Optimum Nutrition
Format
Bar
Age Range Description
Adult
Speciality
No Added Sugar
Package Information
Box
Manufacturer
Optimum Nutrition
Serving Size
100 g
Energy (kcal)
334.12 kcal
Fat
9.7 g
of which:
-
- Saturates
7.7 g
Carbohydrate
27 g
of which:
-
- Sugars
5.9 g
Protein
31 g
Salt
1.1 g
Have a Question? See What Others Asked
What's new with OPTIMUM NUTRITION Bars?
The label looks different compared to the previous one I got, is it still the same OPTIMUM NUTRITION product?
Are the ingredients tested and safe?
Reviews
3.9
All from verified purchases
T**A
For those who love delicious protein bars
Love the marshmallow taste.I go to gym and used to always find it hard to get some sort of snack afterwards to keep me going till mealtime plus something with protein in. Then a friend recommended this product.Love it!The only downside the amount of sugar. As much as I like the taste, at times it is a tad too sweet for me.If you are not into sugary bars, then it's not the product for you, but otherwise, it's a great protein bar and keeps one going after a good workout session.Would definitely recommend.
C**E
217 calories per bar.
The media could not be loaded. I made a mistake, I thought the 20g on the packet was the weight, but it's actually for the protein content. These are 65g bars and 217 calories.
H**H
American chocolate taste - but happy other than that
I'm a fan of Optimum Nutrition, who always put out good quality products - whether that is bars or powders or drinks - I'm very trusting of their brand.These bars look great once you open them up - like a premium chocolate bar.You get a solid 20grams protein per bar, but they do come loaded with 6.3grams of fat and 5grams of saturated fat, which is pretty considerable and worth checking against your macros if you track that kind of thing.Unfortunately for me, the bars have an American Chocolate taste, which I'm quite sensitive to. For people who do have the same sensitivity as me, you can end up getting a weird sour/earthy taste when you eat these and it's not really something you can just overlook for the nutritional benefits either.That said, I gave them to a friend who has been really enjoying them and doesn't experience the same weird tastes as me... so it's certainly based on the individual.
J**S
Really tasty!
First impressions of these were good, the bars are a decent size and come in a branded display box.Taste wise they are very sweet, definitely one for those with a sweet tooth! They really do taste like marshmallow and white chocolate and are more chewy than crunchy. It has a bit of a milky aftertaste with a hint of the protein bar coming through.Overall though I really enjoyed these as a quick snack/ tasty treat and a good way to get my protein in!
T**G
Sometimes very stale
I have bought the marshmallow flavour a few times but it can be a hit or a miss. Sometimes they are like a normal bar but frequently the appear to be off slightly? Almost very hard / stale.
R**Y
Top marks for nutritional content but the flavour wasn't for me
First, the positives - what these bars have going for them is the very decent size, which makes for a filling post-workout or between-meals healthier snack. They're substantial, have a nice chewy (rather than crunchy) texture thanks to the crispie-style mix, and they pack a very decent 20g of protein per bar.In terms of taste, I just found them OK, and they're not my favourites in the Optimum Nutrition range. They certainly look the part, like drizzled flapjacks. And they are extremely sweet, and that sweetness does taste a little artificial. There's a definite 'health bar' feel to this where the other varieties manage to taste more 'treat', although that could just be personal taste (after all, marshmallow isn't the most subtle or natural flavour).You can't fault the bar on nutritional content, though, like all the ON products - they're solid, and make for a great addition to a managed, high-protein diet. Top marks for content as always - and if you like marshmallow, they could be right up your street (though personally I'll stick to the Chocolate Sea Salt Crunch).
K**
In love with these bars.. they taste amazing
This is my favourite flavour bar from the ones I've tried I've tried maybe 5 or 6 others not every flavour they have on offer but this one it's yummyThe best flavour in my opinion, nice for a guilt free treat. Also good melted in the microwave as a pudding! Delicious.Great protein bar. Always keep some of these in the cupboard as you just can't go wrong with them. Taste great but not too protein-y tastingThis protein bar is amazing! Tastes like A really tasty chocolate bar. I just want to inhale the whole box! Very moreish. My personal favourite
L**E
Not so tasty.
Quite an artificial taste to it, not a product I will buy again.
Common Questions
Trustpilot
TrustScore 4.5 | 7,300+ reviews
Vikram D.
The MOLLE sheath is of exceptional quality. Very happy with my purchase.
2 weeks ago
Ayesha M.
The product exactly matches the description. Very satisfied with my purchase.
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Then a friend recommended this product.Love it!The only downside the amount of sugar. As much as I like the taste, at times it is a tad too sweet for me.If you are not into sugary bars, then it's not the product for you, but otherwise, it's a great protein bar and keeps one going after a good workout session.Would definitely recommend."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"C***E"},"datePublished":"3 August 2023","name":"217 calories per bar.","reviewBody":"The media could not be loaded. I made a mistake, I thought the 20g on the packet was the weight, but it's actually for the protein content. These are 65g bars and 217 calories."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"3.0"},"author":{"@type":"Person","name":"H***H"},"datePublished":"30 August 2023","name":"American chocolate taste - but happy other than that","reviewBody":"I'm a fan of Optimum Nutrition, who always put out good quality products - whether that is bars or powders or drinks - I'm very trusting of their brand.These bars look great once you open them up - like a premium chocolate bar.You get a solid 20grams protein per bar, but they do come loaded with 6.3grams of fat and 5grams of saturated fat, which is pretty considerable and worth checking against your macros if you track that kind of thing.Unfortunately for me, the bars have an American Chocolate taste, which I'm quite sensitive to. For people who do have the same sensitivity as me, you can end up getting a weird sour/earthy taste when you eat these and it's not really something you can just overlook for the nutritional benefits either.That said, I gave them to a friend who has been really enjoying them and doesn't experience the same weird tastes as me... so it's certainly based on the individual."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"J***S"},"datePublished":"12 November 2023","name":"Really tasty!","reviewBody":"First impressions of these were good, the bars are a decent size and come in a branded display box.Taste wise they are very sweet, definitely one for those with a sweet tooth! They really do taste like marshmallow and white chocolate and are more chewy than crunchy. It has a bit of a milky aftertaste with a hint of the protein bar coming through.Overall though I really enjoyed these as a quick snack/ tasty treat and a good way to get my protein in!"},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"1.0"},"author":{"@type":"Person","name":"T***G"},"datePublished":"21 May 2024","name":"Sometimes very stale","reviewBody":"I have bought the marshmallow flavour a few times but it can be a hit or a miss. Sometimes they are like a normal bar but frequently the appear to be off slightly? Almost very hard / stale."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"4.0"},"author":{"@type":"Person","name":"R***Y"},"datePublished":"16 September 2023","name":"Top marks for nutritional content but the flavour wasn't for me","reviewBody":"First, the positives - what these bars have going for them is the very decent size, which makes for a filling post-workout or between-meals healthier snack. They're substantial, have a nice chewy (rather than crunchy) texture thanks to the crispie-style mix, and they pack a very decent 20g of protein per bar.In terms of taste, I just found them OK, and they're not my favourites in the Optimum Nutrition range. They certainly look the part, like drizzled flapjacks. And they are extremely sweet, and that sweetness does taste a little artificial. There's a definite 'health bar' feel to this where the other varieties manage to taste more 'treat', although that could just be personal taste (after all, marshmallow isn't the most subtle or natural flavour).You can't fault the bar on nutritional content, though, like all the ON products - they're solid, and make for a great addition to a managed, high-protein diet. Top marks for content as always - and if you like marshmallow, they could be right up your street (though personally I'll stick to the Chocolate Sea Salt Crunch)."},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"5.0"},"author":{"@type":"Person","name":"K*** "},"datePublished":"3 August 2023","name":"In love with these bars.. they taste amazing","reviewBody":"This is my favourite flavour bar from the ones I've tried I've tried maybe 5 or 6 others not every flavour they have on offer but this one it's yummyThe best flavour in my opinion, nice for a guilt free treat. Also good melted in the microwave as a pudding! Delicious.Great protein bar. Always keep some of these in the cupboard as you just can't go wrong with them. Taste great but not too protein-y tastingThis protein bar is amazing! Tastes like A really tasty chocolate bar. I just want to inhale the whole box! Very moreish. My personal favourite"},{"@type":"Review","reviewRating":{"@type":"Rating","ratingValue":"2.0"},"author":{"@type":"Person","name":"L***E"},"datePublished":"27 January 2025","name":"Not so tasty.","reviewBody":"Quite an artificial taste to it, not a product I will buy again."}],"aggregateRating":{"@type":"AggregateRating","ratingValue":3.75,"bestRating":5,"ratingCount":8}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What's new with OPTIMUM NUTRITION Bars?","acceptedAnswer":{"@type":"Answer","text":"Not only do OPTIMUM NUTRITION bars have a fresh look, but they also have an updated formula. Whipped Protein Bars and Fruit & Nut Protein Crisp bars are free from palm oil and suitable for vegetarians."}},{"@type":"Question","name":"The label looks different compared to the previous one I got, is it still the same OPTIMUM NUTRITION product?","acceptedAnswer":{"@type":"Answer","text":"As you evolve, so do we. The part of our mission is to help active individuals better understand OPTIMUM NUTRITION products. Now choosing the right product for you is easier with more visible product benefits, features and flavours on each tub."}},{"@type":"Question","name":"Are the ingredients tested and safe?","acceptedAnswer":{"@type":"Answer","text":"All of the ingredients in our products have been approved and considered safe for consumption by the European Food Safety Authority."}}]}]}