Best Protein Bars (UK): 8 Real Picks for 2026

Lisa BenzNutrition editorUpdated Sep 2026

If you’re shopping for protein bars in the UK, most “best protein bar” roundups you’ll find online are written for American shelves. They point you to David Protein, RXBAR or Aloha, brands that are genuinely difficult or expensive to buy if you live in Leeds or Cardiff rather than Los Angeles. This guide only covers bars you can actually walk into a UK Tesco or Holland & Barrett and buy, or order from Amazon UK and MyProtein’s UK site and have delivered this week.

We checked eight bars that are genuinely stocked in the UK: Grenade, Fulfil, TREK, Bounce, MyProtein, USN, Battle Bites and Warrior. Prices are in GBP, pulled from UK retailer listings in September 2026. Retail prices at Tesco and Holland & Barrett move around with Clubcard offers and promotions, so treat every price below as a snapshot, not a guarantee, and check the live price before you buy.

How We Picked These 8 UK Protein Bars

We started from what’s actually on UK shelves rather than a generic global list. We cross-checked each brand’s own UK product pages against Tesco Groceries, Holland & Barrett and Amazon UK listings, and pulled per-bar protein, sugar, calorie and price figures directly from those retailer pages wherever they were published. Where a brand’s own site and a retailer listing disagreed on a number, or where a figure varies by flavour, we say so rather than picking whichever number looked best.

We deliberately left out several bars that dominate American listicles, such as David Protein, RXBAR, Aloha, IQBar, Built Bar and Pure Protein, because none of them actually has a mainstream UK retail presence. If you want that US-focused view, our general best protein bars roundup covers those brands in detail.

The 8 Best Protein Bars in the UK, at a Glance

A few patterns stand out immediately, and they’re worth flagging upfront. Almost every UK gym-style bar lands in the same 20g-protein, sub-3g-sugar band, so the real differences come down to price, texture and where you can actually buy the thing without paying for shipping. TREK and Bounce are the outliers: both trade some protein for a more natural ingredient list, and Bounce’s ball format puts it in a different category from the rest entirely.

1. Grenade Carb Killa (Best Overall)

Grenade is a Boston, Lincolnshire company, and Carb Killa is the bar most UK gyms and supermarkets stock as their default protein bar. It reads like a chocolate bar: a chocolate-coated wafer or nougat centre with more than 15 flavours on shelf, including Oreo, White Chocolate Salted Peanut, Peanut Nutter and Caramel Chaos. Protein and calorie counts shift a little by flavour, generally between 20g and 23g of protein and 210 to 220 calories, with sugar kept under 2g across the range using a sweetener blend rather than added sugar.

The single-bar RRP at Tesco has been around £2.70 to £2.90, with Tesco Clubcard pricing regularly bringing it down to about £1.80 to £2.00. Buying a 12-bar box works out closer to £1.83 per bar. Given how widely it’s stocked and how consistently reviewers rate the taste above chalkier competitors, this is, frankly, the easiest “just buy one” recommendation on this list for most UK shoppers, and you don’t need to shop around to get a fair price.

2. Fulfil Vitamin & Protein Bar (Added Vitamins)

Fulfil’s an Irish brand that’s become one of the biggest protein bars on UK supermarket shelves, and its real differentiator isn’t protein but vitamins: each 55g bar’s carrying a genuinely useful 30% of the recommended daily allowance of nine vitamins, including B2, B3, B6, B12, folic acid and vitamin E, on top of a standard 20g of protein and under 3g of sugar. It comes in more than 13 flavours, from Dark Chocolate Orange to Chocolate Salted Caramel, and the bars are noticeably softer and more like a filled chocolate bar than Grenade’s wafer texture.

At Tesco, a single 55g bar’s priced around £2.90, dropping to about £2.00 with a Clubcard offer, which puts it slightly above Grenade on a per-bar basis. If you like the idea of a snack that’s doing a small amount of micronutrient work alongside the protein, Fulfil is the most established UK option built specifically around that pitch, though it does cost a little more than Grenade.

3. TREK Protein Flapjack (Vegan and Natural)

TREK’s a British brand built around oat-based flapjacks rather than gym-style chocolate bars, and the whole range is vegan and gluten-free. A 50g bar carries about 9g of protein and roughly 220 calories, both figures well below the 20g-protein bars on this list, because TREK’s aiming at a “natural snack with some protein” positioning rather than a post-workout protein hit. Sugar comes from oats and dried fruit rather than being disclosed as a single consistent number across the retailer pages we checked, so check the pack for the exact figure on the flavour you buy.

Single bars run about £1.89 at Holland & Barrett, and multipacks are available at Tesco with Clubcard pricing bringing a 3-pack down from around £3.60 to roughly £2.75. If you want something closer to a health-food-shop flapjack than a protein-shake replacement, and you need it to be vegan and gluten-free, TREK is the clearest UK option.

4. Bounce Protein Ball (On-the-Go Ball Format)

Bounce is a UK-produced protein ball rather than a bar, launched by a husband-and-wife personal trainer and life coach team, and it’s a genuinely different format from everything else on this list. A single ball weighs 35g to 49g depending on the variety and carries 8g to 13g of protein and 160 to 210 calories, with sugar sitting higher than the gym-style bars, typically 9g to 11g, most of which comes from dates rather than added sugar. Several flavours, including Peanut Cacao and Coconut Macadamia, are vegan.

Pricing varies by size and retailer: a Peanut Butter ball runs about £2.43 at Holland & Barrett, while smaller snack-pack formats have an RRP closer to £1.49. Bounce isn’t trying to compete with Grenade or Fulfil on protein density; it’s really closer to a fruit-and-nut energy ball with a protein boost, which makes it a reasonable pick if a 20g-protein chocolate bar feels too much like dessert for an everyday snack.

5. MyProtein Layered Protein Bar (For MyProtein Loyalists)

MyProtein’s a Manchester-founded brand better known for its whey powder than its bars, but the Layered Protein Bar has become a solid UK option in its own right: a 60g bar with six layers, including a chocolate coating, crunchy soya nuggets and a caramel centre, delivering 20g of protein, under 2g of sugar and 231 calories. If you already buy MyProtein’s whey and want your bar spend on the same account and delivery schedule, this is the obvious pick.

Pricing’s the one place MyProtein’s genuinely hard to pin down: because the brand runs near-constant sitewide sales, a 12-bar box has been seen anywhere from around £18.95 to the mid-£20s depending on the day, working out to roughly £1.58 to £1.90 per bar. During our own check, a twin variety-box bundle was listed at £32.49, marked down from £51.98, which underlines just how much the headline price moves with promotions. Check the live price on myprotein.com before you buy rather than trusting any single number, including ours. For more on the brand’s pricing pattern and product range beyond bars, see our full MyProtein review.

6. USN Trust Fusion Protein Bar (Low-Sugar Import Pick)

USN’s a South African sports nutrition brand with a strong UK presence through Holland & Barrett, and the Trust Fusion bar is its answer to Grenade and Fulfil: a 55g bar with 20g of protein, under 2g of sugar and around 210 calories, sold in three flavours (Chocolate Cookie, Salted Caramel, and White Chocolate & Coconut). It’s one of the more consistently low-sugar options on this list without sacrificing the 20g protein number most UK buyers are shopping for.

On USN’s own UK store a 12-bar box has listed at around £30, which works out to about £2.50 per bar, noticeably above Grenade and Warrior on price. Holland & Barrett and Amazon UK sometimes carry it cheaper through multibuy offers, so it’s worth comparing before buying direct from the brand.

7. Battle Bites (Best Budget)

Battle Bites’s a UK-made bar sold as two 31g “bites” per 62g pack, with a genuinely large flavour range that leans into dessert names such as Glazed Sprinkled Donut, Jaffa Bake, Sticky Toffee Pudding and Toffee Apple Popping Candy. Each pack carries 20g to 21g of protein and lands between 220 and 244 calories depending on flavour, with sugar in the 4g to 5g range, a touch higher than Grenade or Fulfil but still well below a standard chocolate bar.

A box of 12 packs has been priced at £17.99, which works out to about £1.50 per bar, making it one of the cheapest 20g-protein options on UK shelves when bought in bulk, even though single-pack RRP is closer to £2.29. If price per gram of protein’s your main filter, Battle Bites is consistently one of the better value picks here.

8. Warrior Crunch (Best Bulk-Buy Deals)

Warrior’s a UK sports nutrition brand stocked in Tesco, Asda and Morrisons as well as online, and the Crunch bar is its main gym-style option, delivering up to 20g of protein with sugar kept under 2.3g. Warrior’s own product pages don’t consistently publish a single calorie figure across every flavour, so we’re not going to invent one; expect it to sit in a similar range to the other 20g-protein bars here, but check the pack for the exact number.

Warrior’s standout feature is discounting: its own site has run boxes of 12 bars down from an RRP of £24.00 to around £14.99, which is roughly £1.25 per bar, among the cheapest prices on this entire list when the deal is live. At full price it’s closer to £2.00 per bar, so the value case really depends on catching a sale.

Protein, Sugar and Calories Compared

Line the eight bars up side by side and the real split isn’t protein content, since six of the eight sit at or near 20g, but format and sugar source instead. Grenade, Fulfil, MyProtein, USN and Warrior all use sweeteners to keep sugar under 3g while hitting 20g of protein. Battle Bites allows a little more sugar (4-5g) in exchange for its low price. TREK and Bounce both trade protein for natural ingredients, and Bounce’s sugar is meaningfully higher because it comes from whole dates rather than sweeteners.

Where to Buy UK Protein Bars

Availability’s one of the biggest practical differences between these eight brands. Grenade, Fulfil, TREK, Bounce and Battle Bites are supermarket and health-store staples, so you can pick them up alongside a weekly shop. MyProtein’s effectively online-only through its own UK site. USN and Warrior sit in between, with a mix of supermarket and specialist sports-nutrition stockists. The grid below shows only the stockists we directly confirmed during research, not an exhaustive list, so a red mark means “not confirmed by us”, not necessarily “not stocked anywhere”.

How to Choose the Right Protein Bar for You

With six of the eight bars landing at roughly the same 20g-protein, sub-3g-sugar spec, the decision usually comes down to one of these priorities rather than the nutrition panel:

• Lowest price per bar: Battle Bites and Warrior (on promotion) are the cheapest ways to hit 20g of protein.
• Widest flavour range: Grenade and Battle Bites both stock 15 or more flavours, so variety fatigue is less of an issue.
• Vegan and gluten-free: TREK’s the only bar here that’s vegan and gluten-free across its whole range; some Bounce flavours are also vegan.
• Lowest sugar: Grenade, MyProtein, USN and Warrior all sit under 2-2.3g of sugar per bar.
• Natural ingredients over sweeteners: Bounce and TREK both lean on oats, dates and dried fruit rather than sugar-alcohol sweetener blends.
• Already buying from the brand: If you use MyProtein whey or USN supplements, buying the matching bar keeps everything on one order and one delivery.

If your priority is taste specifically rather than price or availability, our best-tasting protein bars roundup ranks bars like Barebells and Quest purely on flavour and texture, though note that roundup is written from a US-availability angle.

What We Could Not Verify

A few numbers on this list are ranges rather than single figures, and we’d rather say that plainly than invent precision that isn’t there. TREK doesn’t publish one consistent sugar figure across its flavour range on the retailer pages we checked, so we’ve described it as “natural, check pack” rather than guessing a gram count. Warrior’s own site doesn’t show a single calorie number that applies across its full Crunch range either. MyProtein and USN pricing both move with frequent sitewide promotions, so any price we quote is a snapshot from when we checked, not a fixed number, and you’ll want to confirm the current price before ordering.

Protein Bars UK FAQ

What is the best-selling protein bar in the UK?

Grenade Carb Killa is, without question, the most widely stocked protein bar in UK supermarkets, helped by wide Tesco and Holland & Barrett distribution and a large flavour range.

Are UK protein bars cheaper at supermarkets or online?

It’s dependent on the brand. Supermarket staples like Grenade, Fulfil and TREK are often cheapest at Tesco with a Clubcard offer applied. Online-first brands like MyProtein are usually cheaper bought directly from their own site during a sitewide sale than through a third-party reseller.

Which UK protein bar has the least sugar?

Grenade, MyProtein, USN and Warrior all advertise sugar under 2 to 2.3g per bar, the lowest group on this list. Bounce has the most sugar of the eight, since it comes from whole dates rather than a sweetener blend.

Is there a vegan protein bar readily available in UK supermarkets?

Yes, there’s a solid option: TREK Protein Flapjack’s vegan and gluten-free across its whole range, and it’s stocked in most large UK supermarkets and Holland & Barrett. Some Bounce protein ball flavours are also vegan.

Do I need a protein bar if I already drink protein powder?

No, a bar and a shake serve the same basic purpose of adding protein to your day, so it really comes down to convenience. If you’re deciding on a powder instead, our best protein powder guide compares options like Optimum Nutrition and Bulk Pure Whey on price and taste the same way this guide compares bars.

About the author

Lisa Benz

Nutrition editor

Lisa Benz tests and compares food products and services for RemoteCanteen, from meal kits to protein. She focuses on what actually matters: taste, price and everyday value.