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The UK’s 15 Best Selling Protein Bars – We Test Them All! 

 July 2, 2020

by Lucas

As you know, we love deep diving into fitness here at The Fit Brit.

Our team (and several girlfriends, boyfriends, kids and spouses!) had a lot of fun putting together this article, where we ordered the 15 best selling protein bars on Amazon and put them to the test.

Why?

Well, we eat a lot of protein bars around here. After workouts, for breakfast, any time really. It seemed like an obvious mission – to find the best protein bars in the UK. How fun, and delicious!

So what does the list look like? We simply went to the Amazon bestseller list and pulled the Top 15:

best protein bars uk

Then we ordered a box of each, split them up against the team, and starting taking notes!

A couple of weeks later after lots of chewy breakfasts and err, gassy adventures, we had our roundtable and made our final decision.

Our winners:

Item
Our Winner!
Grenade Carb Killa Bar
Our Runner Up
RXBAR Protein Bar
3rd Place
Optimum Nutrition Protein Crisp Bar
Preview
Grenade Carb Killa High Protein and Low Carb Bar, 12 x 60 g - A Selection Box
RXBAR, Protein Bar, Blueberry, Gluten Free, 12-Pack, Made in the UK
Optimum Nutrition Protein Crisp Bar with Whey Protein Isolate, Low Carb High Protein Snacks with No Added Sugar, Marshmallow, 10 Bar (10 x 65 g)
Our score
38.5 / 50
36.5 / 50
36 / 50
Protein content
20g
12g
20g
Fat content
9.5g
7.1g
6.3g
Carb content
18g
20g
17g
Sugar content
1.7g
15g (dates)
3.8g
Size
60g
52g
65g
Flavours
13
5
3
£19.76
£20.00
£15.95
Our Winner!
Item
Grenade Carb Killa Bar
Preview
Grenade Carb Killa High Protein and Low Carb Bar, 12 x 60 g - A Selection Box
Our score
38.5 / 50
Protein content
20g
Fat content
9.5g
Carb content
18g
Sugar content
1.7g
Size
60g
Flavours
13
£19.76
Our Runner Up
Item
RXBAR Protein Bar
Preview
RXBAR, Protein Bar, Blueberry, Gluten Free, 12-Pack, Made in the UK
Our score
36.5 / 50
Protein content
12g
Fat content
7.1g
Carb content
20g
Sugar content
15g (dates)
Size
52g
Flavours
5
£20.00
3rd Place
Item
Optimum Nutrition Protein Crisp Bar
Preview
Optimum Nutrition Protein Crisp Bar with Whey Protein Isolate, Low Carb High Protein Snacks with No Added Sugar, Marshmallow, 10 Bar (10 x 65 g)
Our score
36 / 50
Protein content
20g
Fat content
6.3g
Carb content
17g
Sugar content
3.8g
Size
65g
Flavours
3
£15.95

Best protein bars criteria:

To find a winner, we rated them out of 10 on five metrics, for a total score out of 50:

  • Protein content
  • Protein type
  • Taste
  • Price
  • Ingredients

Protein content

A protein bar needs to have a good amount of protein! Ideally we wanted bars that had at least 20g of protein, the amount of a regular protein shake. Scores were given as follows:

30g+ protein: 10/10
25g+ protein: 9/10
20g+ protein: 8/10
15g+ protein: 7/10
12g+ protein: 6/10
10g+ protein: 5/10
8g+ protein: 4/10

Protein type

Not all proteins are created equal. There’s a big difference between low quality soy proteins and whey protein isolates sourced from pastured cows. Not only do we want a good amount of protein, we want high quality protein. They were scored as follows:

Very high quality protein (e.g. organic grass fed whey): 10/10
High quality protein (e.g. grass fed whey): 9/10
Quality protein (e.g. whey protein isolates, concentrates): 8/10
Quality protein blends (e.g. milk and whey concentrates): 7/10
Lower quality proteins like soya and rice: 6/10
Other lower quality blends: 5/10 or less

Taste

Taste is very subjective, so we did the best we could. None of us personally tried every single bar, so we just gave a subjective score. Remember what tastes good to us might taste horrible to you, and vice versa!

Price/Value

Value for money is also important. We don’t want to go broke trying to hit our macros for the day. We scored these on a basic pound for pound scale:

£5.00 per 100g: 4/10
£4.50 per 100g: 5/10
£4.00 per 100g: 6/10
£3.50 per 100g: 7/10
£3.00 per 100g: 8/10
£2.50 per 100g: 9/10

Ingredients

Are they packed with sugar? If they use non-sugar sweeteners, are they the good ones or the bad ones?

Are they packed with additives or preservatives? Or are they filled with organic nuts and seeds and coconut flakes?

We want the whole bar to be high quality, not just the protein. We analysed the ingredients lists, then gave a subjective score out of 10, doing our best to stay consistent across the list.

Our protein bar reviews

Read on for our in-depth reviews of each bar, our ratings, and why we gave them. In order of bestselling rank on Amazon:

Grenade Carb Killa High Protein Bars (Our Winner)

Grenade Carb Killa High Protein and Low Carb Bar, 12 x 60 g - A Selection Box

Protein content: 8/10
Each bar contains 20g of protein

Protein type: 8/10
Calcium caseinate, whey protein isolate

Taste: 8/10
A little on the sweet side, but the cookies and cream flavour was superb. Tasted like a chocolate bar.

Price: 8/10
£2.63 per 100g.

Ingredients: 6.5/10
Only 2g of sugar per bar (good). Lots of peanuts (okay). We’re not a huge fan of maltitol (here’s why), which acts similar to sugar in the body. We would’ve preferred solely sucralose as a sweetener.

Our final score: 38.5/50

Order here!

PhD Smart Bar High Protein Low Sugar Bar

PhD Smart Bar High Protein Low Sugar Bar, Variety Box, 64 g, Pack of 6 PHD-SB6pack

Protein content: 8/10
Each bar contains 20g of protein.

Protein type: 6.5/10
Milk protein, collagen hydrolysate, soya protein isolate. We like the collagen, but we’re not big fans of soya protein as sourcing and quality is unknowable which reduces this score.

Taste: 8/10
We like it a lot. Not too sweet. Interesting fillings.

Price: 7/10
£3.38 per 100g.

Ingredients: 5/10
23g of carbs per bar which is far too high in our opinion. We realise most of it (20g) is polyols and only 0.6g sugar, but polyols aren’t all innocent. In fact the ingredients list shows both maltitol and sorbitol, which are our least favourite polyols, especially if you’re keto. This would have been less disappointing if they hadn’t advertised these as “low carb”.

Our final score: 34.5/50

Order here!

TREK High Protein Flapjack Gluten Free Bars

TREK High Protein Flapjack Cocoa Coconut, 50 g - Gluten Free Bars – Healthy Snack Bars – Plant Based Protein - Vegan Bars (Pack of 16 Bars)

Protein content: 4/10
Each bar contains 9g of protein. Too low for us.

Protein type: 3/10
Soya protein crunchies. If we knew source (e.g. organic or not, place of origin) this score would be higher. Otherwise our vegan protein of choice is pea protein.

Taste: 6/10
Taste a little ordinary. Nothing bad but nothing you would buy especially for the taste.

Price: 8/10
£2.53 per 100g

Ingredients: 4/10
13.5g sugar in a 50g bar is way too high. We’re also not a fan of the vegetable oils or the rice syrup. We like the gluten free oats and the coconut, and we’re glad the sugar is raw cane sugar. But not an impressive ingredients list overall.

Our final score: 25/50

Order here!

PhD Nutrition High Protein Flapjack+ Bars

PhD Nutrition High Protein Flapjack+ Bars, Peanut Butter, 75 g, Pack of 12

Protein content: 7/10
Each bar contains 19g of protein.

Protein type: 7.5/10
Milk, gelatine and whey blend.

Taste: 6.5/10
Just okay. Bit cardboard-ish.

Price: 8/10
£2.55 per 100g.

Ingredients: 6/10
High carb count which isn’t necessarily bad depending on the source. This seems mostly to be from oats and some polyols. It’s reasonably innocent otherwise.

Our final score: 35/50

Order here!

FULFIL Vitamin and Protein Snack Bar

FULFIL Vitamin and Protein Snack-Size Bar (15 x 40g Bars) — Chocolate Brownie Flavour — Low Sugar, 15g High Protein, 9 Vitamins

Protein content: 7/10
Each bar contains 15g of protein

Protein type: 7/10
Milk protein.

Taste: 8/10
We did the hazelnut whip and thought it was great. Tasted like a chocolate bar!

Price: 4/10
£5 per 100g

Ingredients: 7/10
Only 1g of sugar per bar. 12g of carbs which will be polyols (sweeteners). Contains maltitol and soy oil. Overall nothing else too sinister in the ingredients list, and even contains some added vitamins.

Our final score: 29/50

Order here!

Battle Bites High Protein and Low Carb/Sugar Bars

Battle Bites High Protein and Low Carb/Sugar Bars 12 x 62 g - Birthday Cake

Protein content: 8/10
Each bar contains 20.5g of protein

Protein type: 7/10
Milk and soy blend, hydrolysed collagen, whey concentrate, calcium caseinate.

Taste: 8/10
For a protein bar, they’re actually amazing.

Price: 7/10
£3.42 per 100g

Ingredients: 4/10
The ingredients list is extremely long, wheat flour, glucose syrup, plus a whole bunch of things you can’t pronounce. As a general rule, short ingredients lists are best.

Our final score: 34/50

Order here!

Misfits Vegan High Protein Low Sugar Bar

Misfits Vegan Protein Bar, Chocolate Caramel (12 x 45g) - 100% Plant Based High Protein, Low Sugar Chocolate Coated Snack - Dairy & Gluten Free

Protein content: 7/10
Each bar contains 16g of protein

Protein type: 7/10
Pea protein isolate, soya protein isolate

Taste: 8/10
We tried the chocolate orange flavour, and were surprised at how good it was.

Price: 6/10
£3.51 per 100g

Ingredients: 7/10
We love the 5.8g of carbs per bar and 0.8g of sugar. This is a vegan bar so no milk products are in it. Rather standard ingredients list in most respects, we do like the stevia sweetener over low quality polyols like maltitol.

Our final score: 35/50

Order here!

Optimum Nutrition Protein Bar

Optimum Nutrition Protein Bar with Whey Protein Isolate, Low Carb High Protein Snacks with No Added Sugar, Caramel Cookie, 10 Bar (10 x 60 g)

Protein content: 8/10
Each bar contains 20g of protein

Protein type: 8/10
Milk protein isolate, whey protein isolate, calcium caseinate, hydrolysed whey protein isolate, whey protein concentrate. Good blend of high quality proteins.

Taste: 6/10
A little ordinary (typical protein powderyness). Wasn’t our favourite.

Price: 5/10
£4.12 per 100g.

Ingredients: 6/10
A few things we don’t like. The maltitol and sorbitol sweetener, the soy protein crispies (they’re okay in a small amount, but just thought we’d note it). The protein dark chocolate coating is a nice touch. Overall, just okay.

Our final score: 33/50

Order here!

Barebells Protein Bar

Barebells Protein Bar | Caramel Cashew 12 x 55g | High Protein Low Carb Low Sugar | 20g of Protein in Every 55g Bar | Delicious Indulgent Protein Bars for Muscle Performance & Recovery

Protein content: 8/10
Each bar contains 20g of protein.

Protein type: 7/10
Milk protein isolate.

Taste: 8/10
We tried the hazelnut and nougat. Delicious.

Price: 5/10
£4.24 per 100g.

Ingredients: 6/10
1.7g sugar per bar. 14g carbs, mostly made up of polyol sweeteners. We like the high cocoa content and the collagen, overall the rest are reasonably standard protein bar ingredients.

Our final score: 34/50

Order here!

Warrior Solo Protein Bars

Warrior Supplements Warrior Solo Protein Bars Box of 12 High Protein Low Carb Bars (Double Chocolate) P35653

Protein content: 5/10
Each bar contains 11g of protein

Protein type: 7/10
Milk protein.

Taste: 8/10
We tried both flavours. Double choc was standard, but the lemon cheesecake is extremely good.

Price: 8/10
£2.74 per 100g

Ingredients: 6.5/10
0.9g of sugar is a great start. The 8.6g of polyols is forgivable as its sucralose, which we don’t mind. The two things we dislike are the wheat gluten and the sunflower oil. Overall it’s not too bad.

Our final score: 34.5/50

Order here!

RXBAR Protein Bar

RXBAR, Protein Bar, Blueberry, Gluten Free, 12-Pack, Made in the UK

Protein content: 6/10
Each bar contains 12g of protein

Protein type: 8/10
Egg protein.

Taste: 8/10
The salted chocolate is very simple, and excellent.

Price: 6/10
£3.68 per 100g.

Ingredients: 8.5/10
Made with free range egg whites. Soy and gluten free. We’re not concerned with dairy but it’s also dairy free. This bar is all natural ingredients, so dates, nuts, blueberries and egg whites. For a protein bar that doesn’t taste terrible, that’s pretty great. 15g of sugar lets it down, but it’s all from dates which gives it a hall pass.

Our final score: 36.5/50

Order here!

Snickers Hi Protein Bar

Snickers Hi Protein Bar (12 x 55g) - High Protein Energy Snack with Caramel, Peanuts and Real Milk Chocolate - Contains 20g Protein

Protein content: 8/10
Each bar contains 20g of protein

Protein type: 7/10
Whey protein concentrate, hydrolysed collagen.

Taste: 8/10
Tastes like Snickers!

Price: 5/10
£4.22 per 100g

Ingredients: 5.5/10
Not great. 20g carbs, 9.5g sugar. Contains a lot of peanut and peanut flour and milk based proteins. One of the few bars on the list that contains just straight sugar, rather than sweeteners that will soften the impact on your blood sugar.

Our final score: 33.5/50

Order here!

Muv Food For Action – Low Carbs Protein Bar

Muv Food For Action - Low Carbs Protein Bar Brownie Flavour 12 x 30 g

Protein content: 5/10
Each bar contains 9.7g of protein

Protein type: 8/10
Milk protein isolate, whey protein isolate

Taste: 6/10
We tried the cookie dough chocolate, not the best. A little hard and dry.

Price: 9/10
£2.50 per 100g

Ingredients: 6/10
5.8g of carbs per bar, which is quite a lot considering the bar is only 30g. Once again maltitol rears its head, which we dislike. This also contains erythritol which is much gentler on your blood sugar, we’re not sure why more bar companies don’t just stick to that (we’re guessing it’s due to cost). Other than that, pretty standard.

Our final score: 34/50

Order here!

Optimum Nutrition Crisp Bar

Optimum Nutrition Protein Crisp Bar with Whey Protein Isolate, Low Carb High Protein Snacks with No Added Sugar, Marshmallow, 10 Bar (10 x 65 g)

Protein content: 8/10
Each bar contains 20g of protein

Protein type: 6.5/10
Soy protein isolate, whey protein isolate, milk protein concentrate.

Taste: 8/10
We went for the marshmallow and it was like one of those sugary cereal bars you had when you were a kid.

Price: 8/10
£2.53 per 100g.

Ingredients: 5.5/10
17g of carbs per bar, mostly from the sweeteners. 3.8g of sugar, which is moderate. Wheat flour we weren’t too keen on.

Our final score: 36/50

Order here!


Nature Valley Protein Bars

Nature Valley Protein Peanut & Chocolate Gluten Free Cereal Bars 4 x 40g (Pack of 8, total 32 Bars)

Protein content: 5/10
Each bar contains 10g of protein

Protein type: 5/10
Soy protein isolate

Taste: 8/10
We went for the peanut and chocolate – tastes like a good old fashioned muesli bar with quite a lot of sweetness to it.

Price: 9/10
£1.56 per 100g.

Ingredients: 4/10
39% peanuts, 8% chocolate. Also contains a lot of sugars – fructose, glucose syrups, plus refined sugars and chicory root. Overall you get what you pay for – good tasting bars but not the healthiest.

Our final score: 31/50

Order here!


Ready to buy? Here’s our winners table again:

Item
Our Winner!
Grenade Carb Killa Bar
Our Runner Up
RXBAR Protein Bar
3rd Place
Optimum Nutrition Protein Crisp Bar
Preview
Grenade Carb Killa High Protein and Low Carb Bar, 12 x 60 g - A Selection Box
RXBAR, Protein Bar, Blueberry, Gluten Free, 12-Pack, Made in the UK
Optimum Nutrition Protein Crisp Bar with Whey Protein Isolate, Low Carb High Protein Snacks with No Added Sugar, Marshmallow, 10 Bar (10 x 65 g)
Our score
38.5 / 50
36.5 / 50
36 / 50
Protein content
20g
12g
20g
Fat content
9.5g
7.1g
6.3g
Carb content
18g
20g
17g
Sugar content
1.7g
15g (dates)
3.8g
Size
60g
52g
65g
Flavours
13
5
3
£19.76
£20.00
£15.95
Our Winner!
Item
Grenade Carb Killa Bar
Preview
Grenade Carb Killa High Protein and Low Carb Bar, 12 x 60 g - A Selection Box
Our score
38.5 / 50
Protein content
20g
Fat content
9.5g
Carb content
18g
Sugar content
1.7g
Size
60g
Flavours
13
£19.76
Our Runner Up
Item
RXBAR Protein Bar
Preview
RXBAR, Protein Bar, Blueberry, Gluten Free, 12-Pack, Made in the UK
Our score
36.5 / 50
Protein content
12g
Fat content
7.1g
Carb content
20g
Sugar content
15g (dates)
Size
52g
Flavours
5
£20.00
3rd Place
Item
Optimum Nutrition Protein Crisp Bar
Preview
Optimum Nutrition Protein Crisp Bar with Whey Protein Isolate, Low Carb High Protein Snacks with No Added Sugar, Marshmallow, 10 Bar (10 x 65 g)
Our score
36 / 50
Protein content
20g
Fat content
6.3g
Carb content
17g
Sugar content
3.8g
Size
65g
Flavours
3
£15.95

If you’re looking for more ways to hit your protein macros, check out your reviews of the best whey protein powders available in the UK today.

Featured image: Marco Verch under CC 2.0

Last update on 2021-04-16 / Affiliate links / Images from Amazon Product Advertising API

About the author 

Lucas

Lucas is the combat sports editor at The Fit Brit. He has been training in MMA for over 10 years, in several gyms in the UK and Thailand. He is currently based in Bangkok.


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