The Verdict Up Front
Most popular UK protein bars are Mushbooh. The usual culprit is not gelatine — it is undisclosed-source E471 in the chocolate coating and unconfirmed natural flavourings, plus gelatine in a handful of bars. No major UK protein bar brand — Grenade, Fulfil, Barebells, MyProtein — holds halal certification.
The safest options are bars that never needed certification because they contain only plant-based whole foods: Nakd and Trek.
How this page works: this is the picks page. The evidence behind every verdict here is our label-level audit of 50 UK protein bars — flavour-by-flavour results, manufacturer responses, the lot. If you want to see the workings, start there; if you want to know what to put in your basket, stay here.
Quick Reference
| Brand | Verdict | Key Concern |
|---|---|---|
| Nakd | ✅ Halal | No additives, 100% plant-based |
| Trek | ✅ Halal | Plant-based, no gelatine |
| Pulsin | ⚠️ Varies | Plant-based, but no halal or vegan certification; natural flavouring undeclared |
| Clif Bar | ⚠️ Mushbooh | E471 in some variants (source undeclared), no cert |
| Grenade Carb Killa | ⚠️ Mushbooh | E471 + E481 (source undisclosed), no cert |
| Fulfil | ⚠️ Mushbooh | E471 + natural flavourings unconfirmed, no cert |
| Barebells | ⚠️ Mushbooh | Non-certified dairy, E471, possible gelatine in some products |
| MyProtein Impact Bar | ⚠️ Mushbooh | E471 + E481 in coating/filling, no cert |
| PhD Smart Bar | ⚠️ Mushbooh / ❌ one flavour Haram | E471 unconfirmed; Millionaire Shortbread has confirmed gelatine |
The E-Codes to Watch
Our 50-bar audit puts numbers on what actually drives protein-bar verdicts: undisclosed-source E471 turned up on 18 of 50 bars and unconfirmed natural flavourings on 33, while gelatine appeared on just 2 — rare, but decisive where it shows up.
- E441 — Gelatine: Derived from porcine (pork) or bovine (beef) collagen. If a bar lists “gelatine” or E441 without specifying bovine/halal-certified, it is Mushbooh at best — and where the audit confirmed the source (PhD Millionaire Shortbread), the verdict is Haram.
- E471 — Mono- and Diglycerides of Fatty Acids: Used as an emulsifier in coatings and chocolate layers. Can be animal- or plant-derived. If the source is not disclosed, treat as Mushbooh.
- E422 — Glycerol: A humectant that keeps bars moist. Glycerol from animal fat is common in food manufacturing — source almost never declared on labels.
- E476 — PGPR: Used in chocolate coatings. Always plant-derived (castor oil). Generally considered halal.
The Halal-Safe Choices
Nakd Bars
Made by Natural Balance Foods in the UK. Every Nakd bar is made exclusively from dates, cashews, almonds, raisins, or fruit — nothing else. No added sugar, no preservatives, no E-numbers, no animal derivatives.
Because all ingredients are plant-based whole foods, Nakd bars are inherently halal regardless of certification status — we walk through the full ingredient breakdown in our Nakd brand guide.
Where to buy: Widely stocked — Tesco, Sainsbury’s, Asda, Holland & Barrett, and on Amazon UK.
Trek Bars
Another UK plant-based bar. Trek uses oats, nuts, seeds, dates, and fruit — occasionally rice syrup. No gelatine, no animal fats, no hidden E-codes of concern. All flavours are suitable for vegans, which is a reliable proxy for no animal derivatives — our audit of Trek’s range checks this flavour by flavour.
Trek Protein Nut Bars are a particularly good option for gym use, providing 10 g protein from pea and rice protein sources.
One flavour-level caveat from the 50-bar audit: the Protein Flapjack Original lists a natural flavouring with no confirmed carrier, so it sits at Mushbooh — the Dark Chocolate flapjack and the Protein Nut Bars cleared every flag. Stick to those.
Where to buy: Tesco, Sainsbury’s, Boots, Holland & Barrett, and Amazon UK.
The Mushbooh Brands Explained
Pulsin Bars
UK-based and made from plant protein (pea, brown rice, or hemp). Pulsin avoids gelatine and animal-derived emulsifiers, and its ingredient lists are short.
Pulsin is often described as certified vegan. Its own site describes the range as plant-based but names no vegan certifier, and we could find no Vegan Society or Vegetarian Society trademark behind the word “certified”. Separately, the bars list an undeclared “natural flavouring” — the same unresolved carrier question that makes us rate other bars Mushbooh. Pulsin also sells whey-based lines, so a brand-level verdict does not fit.
Verdict: Varies. The plant bars are clean apart from the flavouring, and nothing here is pork-derived — but plant-based and probably fine is not the same as verified, and that standard has to apply consistently or not at all. If Pulsin discloses the flavour carrier, these move up.
Clif Bar (Original and Nut Butter)
US brand, widely available in UK supermarkets. The classic oat-based Clif Bar is built on oats, soy protein, dried fruit and soy lecithin — no gelatine, and no E471 in most of the classic flavours. The Nut Butter Filled range is similarly plant-based. On ingredients alone these are among the cleanest bars on the shelf.
The problem is the range, not the recipe. Our CLIF Bar brand guide rates the brand Mushbooh: there is no halal certification, and E471 appears in some variants with no declared source — plant or animal. “Most classic flavours” is not “all”, and without a certifier or a vegetarian-suitable label on every pack, there is no way to confirm which tub of E471 went into which bar. The White Chocolate Macadamia variety adds whey protein from non-certified dairy on top.
Verdict: Mushbooh. Clean base, unverifiable emulsifier. If you want a plant-based bar with nothing left to check, Nakd and Trek above answer the same craving without the gap.
Grenade Carb Killa
The UK’s best-selling protein bar. There is no gelatine in Carb Killa — the problem is the emulsifier pair: E471 in the chocolate coating and E481 in the caramel and bar matrix, neither with a declared plant or animal source. Grenade holds no halal certification for any UK product, and every flavour we ran through the 50-bar audit came back Mushbooh. The bars are manufactured in the UK (now owned by Mondelez), but Mondelez does not maintain halal oversight for the Grenade range, and Grenade declined to respond to our ingredient source enquiry.
The whey and milk chocolate throughout the range also come from non-certified dairy.
Verdict: Mushbooh. Undisclosed-source E471 and E481 across the range, with no certification to resolve them.
Fulfil Bars
Irish brand, popular across UK gyms and petrol stations. Current Fulfil labels checked in our 50-bar audit show E471 with no source declaration and unconfirmed natural flavourings — no gelatine on the ingredient list, but no disclosure on the two things that matter either. Fulfil is not halal-certified and has not publicly responded to halal queries.
Verdict: Mushbooh.
Barebells
Swedish brand. As our Barebells brand guide sets out in detail, the company holds no halal certification in any of its markets (Sweden, UK, US, Germany). The concerns stack up: milk and whey proteins from non-certified dairy supply chains, E471 in the chocolate coating with no declared source, and possible gelatine use (source unspecified) in some products for texture. The coating’s E476 (plant-derived) and E322 (soya lecithin) are halal, but they do not offset the rest.
Verdict: Mushbooh.
MyProtein Impact Bar & Layered Bar
MyProtein is the largest UK sports nutrition brand. Its bars carry E471 and E481 in the coating and filling layers with no source disclosure, gelatine remains a possible concern in some bars, and no bar carries halal certification. MyProtein’s certification varies by product line: the flavours it lists as halal-certified are whey powders — and MyProtein names no certifying body even for those — so the brand’s halal credentials, such as they are, do not reach this shelf.
Verdict: Mushbooh.
PhD Smart Bar
No halal certification, undisclosed-source E471 across the flavours we checked — and one flavour crosses the line entirely: the 50-bar audit confirmed gelatine in PhD Smart Bar Millionaire Shortbread, which makes that flavour Haram, not merely doubtful. Owned by NBTY Europe — same parent as Solgar, but halal oversight is absent across the range.
Verdict: Mushbooh — except Millionaire Shortbread, which is Haram.
Why Don’t Protein Bars Get Halal Certified?
Halal certification requires a full audit of every ingredient source — including the gelatine supplier’s slaughter methods, the whey powder supplier, and any shared production lines. For a protein bar made with bovine gelatine, certification is achievable but adds cost and requires regular audits.
The UK gym/sports nutrition market has historically treated halal as a niche concern rather than mainstream demand. Brands serving Malaysia, the UAE, or Saudi Arabia (like MyProtein’s MY range) do maintain certified lines — but those products are not exported to the UK.
This will likely change as UK Muslim consumers become a more explicit target audience. Until then, plant-based bars remain the most reliable halal option.
Bottom Line
Safe choices: Nakd and Trek — plant-based, no gelatine, no undisclosed animal fats. (We removed Pulsin from this list in July 2026: its bars carry an undeclared natural flavouring, and the “vegan-certified” status widely attributed to it — including by us — could not be verified against any certifier.)
Avoid if strictly observant: Grenade Carb Killa, Fulfil, Barebells, MyProtein bars, PhD Smart Bar — all carry undisclosed-source E471/E481, unconfirmed natural flavourings or non-certified dairy proteins without halal certification, and PhD’s Millionaire Shortbread flavour has confirmed gelatine, making it Haram outright. Clif Bar sits just inside this group on a technicality worth knowing: the classic flavours are clean, but E471 appears undeclared in some variants, so the range as a whole is Mushbooh.
If you’re checking other snack bars, search for E471, E481 and E441 on our E-code database — the first two cover the majority of protein bar concerns; gelatine is rarer but decisive where it appears. A photo of the full label run through the ingredient scanner checks every additive at once.
Frequently Asked Questions
Are Nakd bars halal? Yes. 100% plant-based ingredients — dates, nuts, fruit. No additives, no E-numbers, no certification needed.
Are Grenade Carb Killa bars halal? Mushbooh. They contain E471 and E481 with no source disclosure, and no halal certification is held.
Are Fulfil protein bars halal? Mushbooh. Current labels show E471 (source unconfirmed) and unconfirmed natural flavourings, with no halal certification in place.
Is Barebells halal? Mushbooh. Non-certified dairy proteins, undeclared-source E471, possible gelatine in some products — and no halal certification in any market including the UK.
Which protein bars are safe for Muslims in the UK? Nakd and Trek — plant-based, with no gelatine or undisclosed animal fats. Clif Bar’s classic flavours come close, but E471 turns up undeclared in some variants, so we rate the range Mushbooh rather than safe.
Ingredients change. Be first to know.
Brands reformulate without warning. We track every E-code update and halal certification — one short weekly email.
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