Best Protein Bars UK (2026)
Why Protein Bars?
A good protein bar bridges the gap between meals when you can’t prep food. They’re not a replacement for whole foods, but for convenience — commuting, post-gym, or mid-afternoon — they’re hard to beat. The best ones deliver 20g+ protein without tasting like cardboard.
Macro Comparison Table
| Bar | Calories | Protein | Carbs | Sugar | Fat | Fibre |
|---|---|---|---|---|---|---|
| Grenade Carb Killa | 220 kcal | 23g | 17g | 2g | 9g | 7g |
| Barebells | 200 kcal | 20g | 18g | 1.5g | 8g | 3g |
| Fulfil | 200 kcal | 20g | 18g | 2g | 8g | 3g |
| PhD Smart Bar | 238 kcal | 20g | 21g | 1.8g | 8g | 10g |
| Myprotein Layered Bar | 219 kcal | 21g | 19g | 2g | 8g | 2g |
Values vary by flavour — these are averages across the range.
1. Grenade Carb Killa — Best Overall
The king of UK protein bars. 23g protein, only 2g sugar, and a gooey, layered texture that genuinely tastes like a chocolate bar. White Chocolate Salted Peanut and Oreo are standouts. Available literally everywhere — Tesco, Sainsbury’s, petrol stations. Around £2.50–3.00 per bar.
2. Barebells — Best Texture
Swedish brand that’s taken the UK by storm. Smoother, firmer texture than Grenade — more like a nougat bar. Slightly lower protein at 20g but the cleanest-tasting bar on this list. Salty Peanut and Hazelnut Nougat are exceptional. Premium pricing at around £2.80.
3. Fulfil — Best Added Extras
Fulfil packs in 9 vitamins alongside 20g protein. The texture is softer and chewier than Grenade. Chocolate Peanut Butter and Chocolate Salted Caramel are top picks. A good choice if you want a bit more from your snack than just protein.
4. PhD Smart Bar — Best for Fibre
10g fibre per bar is the standout stat — nearly a third of your daily target. The texture is dense and chewy, almost brownie-like. At around £2.00 per bar, they’re the most budget-friendly on this list. Chocolate Brownie flavour lives up to its name.
5. Myprotein Layered Bar — Best Value
The cheapest per bar, especially during Myprotein sales where a box of 12 drops below £18. Layered texture similar to Grenade. 21g protein and decent flavours — Chocolate Sundae is the pick of the range. Slightly drier texture than the competition.
What to Watch Out For
Protein bars often contain sugar alcohols (maltitol, erythritol) which can cause digestive discomfort in some people. If you’re eating more than one a day, keep an eye on this. Also check the calorie count — some “protein” bars are closer to 300 kcal with more sugar than protein.
The Bottom Line
Grenade for all-round quality. Barebells for taste snobs. PhD for budget and fibre. Fulfil if you want added vitamins. Myprotein if you buy in bulk and want the lowest cost per bar.
Free 12-Week Workout Plan
Get a complete training programme delivered to your inbox — structured, progressive, and designed for all levels. No spam, unsubscribe any time.