Which protein bar has the most protein in this comparison?
Grenade Carb Killa Dark Chocolate Mint lists 22g protein per 60g bar, the highest amount among these five specific products. This is not a claim about all bars sold in Ireland.
Best Protein Bars in Ireland: What Five Popular Labels Actually Tell Us
Published · Updated · Sláinte Editorial
The protein-bar shelf has become a miniature supplement shop. Bars promise 20 grams of protein, almost no sugar, added vitamins or a high-fibre snack that feels like a chocolate bar.
Those claims can be useful. But they do not explain the entire food.
In five bars listed by Tesco Ireland, protein ranges from 10.2g to 22g per bar, while declared polyols reach 18g in some varieties. There are also noticeable differences in saturated fat, fibre and serving weight.
That does not mean a bar with a long ingredients list is automatically bad, or that the one with the most protein is necessarily the best. It means that different products deliver different trade-offs.
We checked five named products and their actual labelled portions, including Irish company Fulfil alongside Grenade and Nature Valley. Here is how they compare, without invented Sláinte Scores or one-size-fits-all winners.
The five bars we compared
We selected specific flavours because nutrition varies even within a single brand. Every figure below is drawn from the retailer's declared nutrition panel for that exact variant and pack weight.
| Exact product | Bar weight | Calories | Protein | Sugars | Fibre | Saturated fat | Polyols |
|---|---|---|---|---|---|---|---|
| Grenade Carb Killa Chocolate Chip Salted Caramel | 60g | 222 kcal | 21g | 1.3g | 2.4g | 5.4g | 18g |
| Grenade Carb Killa Dark Chocolate Mint | 60g | 202 kcal | 22g | 0.4g | 3.1g | 3.4g | 18g |
| Fulfil Salted Caramel Vitamin & Protein | 55g | 204 kcal | 20g | 1.7g | 3.4g | 5.0g | 13g |
| Fulfil Chocolate Brownie Vitamin & Protein | 55g | 197 kcal | 20g | 1.5g | 3.7g | 4.4g | 13g |
| Nature Valley Protein Peanut & Chocolate | 40g | 196 kcal | 10.2g | 6.9g | 4.4g | 3.0g | Not separately declared |
Per whole bar, not per 100g. “Not separately declared” does not mean zero. Figures reflect retailer listings checked 20 October 2026 and may change after reformulation.
The differences are easier to understand when we separate the questions.
If your priority is protein quantity from one bar, the Grenade Dark Chocolate Mint example lists 22g. If you want a bar that also provides fibre, the Nature Valley example lists 4.4g, but it supplies about half as much protein as the 20 to 22g bars. If you are sensitive to polyols, the declared 13 to 18g amounts on several products deserve attention before the word low sugar.
No single row answers every question.
Why serving size matters before everything else
A protein bar is generally eaten as one unit. So the number per bar is particularly useful.
But bars here range from 40g to 60g. A larger bar can naturally contain more protein, energy and other nutrients simply because there is more food.
For comparing concentration, we can also calculate protein per 100 calories using the labelled portions:
| Bar | Protein per 100 kcal, approximately |
|---|---|
| Grenade Chocolate Chip Salted Caramel | 9.5g |
| Grenade Dark Chocolate Mint | 10.9g |
| Fulfil Salted Caramel | 9.8g |
| Fulfil Chocolate Brownie | 10.2g |
| Nature Valley Peanut & Chocolate | 5.2g |
This ratio describes protein density relative to energy. It is not a health score, because it ignores fibre, sugars, saturated fat, ingredients and individual needs.
A person trying to add more energy during demanding activity may not have the same priorities as someone looking for a compact protein contribution. Comparing the actual bar is more useful than comparing packaging claims alone.
How can a protein bar contain very little sugar but still taste sweet?
Look at the first four bars in our table. All list fewer than 2g of sugars per bar, yet they are clearly designed to taste sweet.
One explanation is the presence of polyols, sometimes called sugar alcohols, and other sweeteners.
Polyols such as maltitol can provide sweetness while contributing less energy per gram than conventional sugar. On EU nutrition labels, polyols can appear within the carbohydrate figure and can also be listed on their own line.
That makes it important not to confuse three figures:
- Total carbohydrate: includes sugars and, where applicable under EU labelling, polyols and other digestible carbohydrate components.
- Of which sugars: identifies mono- and disaccharides in the food, not every ingredient with a sweet taste.
- Of which polyols: identifies the declared sugar-alcohol fraction, where supplied.
For example, the Grenade Chocolate Chip Salted Caramel bar lists 20g carbohydrate, 1.3g sugars and 18g polyols per 60g bar. These values are related categories, not figures to add together.
A product can therefore legitimately be labelled low in sugar and contain substantial amounts of other sweetening ingredients.
Can polyols upset your stomach?
Yes, for some people and at some intakes. Polyols may be incompletely absorbed and can produce digestive symptoms including bloating, wind and diarrhoea, especially when large amounts are consumed.
The Grenade product listing and some Fulfil listings carry warnings about potential laxative effects with excessive consumption.
That does not make polyols inherently unsafe at permitted food-use levels. It means individual tolerance and quantity matter.
If you notice discomfort after eating a bar, the list of sweeteners and the declared polyol amount are worth checking. Eating several bars in a day can also increase total intake substantially.
Are sweeteners in protein bars dangerous?
Authorised food additives and sweeteners are subject to EU rules and safety assessments, including work by EFSA.
A scientific safety assessment is different from a claim that a food is nutritionally ideal, or that everyone tolerates the ingredient in exactly the same way.
The question for shopping is not simply whether a sweetener is present. It is what the complete product provides, how much of it you consume and whether it suits you.
The bar with the lowest sugar is not automatically the bar with the best overall profile
The Grenade Dark Chocolate Mint product in this selection declares 0.4g sugar per bar, the lowest of the five products.
It also contains 18g polyols and 3.4g saturated fat per bar.
The Nature Valley product has 6.9g sugars per bar, the highest in this group. But it also provides 4.4g fibre, includes roasted peanuts as its first listed ingredient and has a different formulation.
Those facts can all be true at once.
Declaring one bar “healthiest” solely because it contains the least sugar would ignore information that matters. Equally, describing the Nature Valley bar as unhealthy because it has more sugars would be an unsupported leap.
The better choice depends on whether you care most about protein, ingredients, fibre, gastrointestinal tolerance, energy or the overall meal.
What ingredients make up the protein?
Protein is not always supplied by the same ingredients.
Grenade Carb Killa
The Salted Caramel variant lists a blend including calcium caseinate and whey protein isolate, alongside bovine collagen hydrolysate. It also contains glycerol, maltitol, chocolate ingredients and polydextrose.
The combination is designed to produce a compact, chewy bar with a high protein content and low declared sugars.
Milk proteins provide essential amino acids. Collagen has a different amino-acid profile and should not automatically be treated as nutritionally interchangeable with whey or casein for every purpose.
The label does not give a complete protein-by-source breakdown, so we cannot calculate how many of the bar's grams come from each ingredient.
Fulfil Vitamin & Protein bars
The Salted Caramel and Chocolate Brownie varieties include milk-derived proteins and collagen-derived ingredients, together with sweeteners and other texturising components.
Fulfil also fortifies selected bars with vitamins. The presence of vitamins is real product information, not evidence that the bar replaces a varied diet.
A bar can supply vitamins while also providing saturated fat or polyols. These characteristics are not mutually exclusive.
Nature Valley Protein Peanut & Chocolate
This bar lists roasted peanuts first, followed by isolated soy protein. It also contains oligofructose, glucose syrup, oils and chocolate ingredients.
The bar supplies less protein per serving than the others, while offering more fibre than several of them.
Its 40g portion is smaller too.
That makes it a different sort of snack, rather than a direct like-for-like replacement for a 60g specialised protein bar.
How much saturated fat is in one bar?
Saturated fat often receives less attention than protein on front-of-pack marketing.
Yet the five bars range from 3.0g to 5.4g of saturated fat per bar.
For context, the EU standard reference intake for saturated fat is 20g for an average adult consuming 2,000 calories. That is a labelling reference, not a personalised maximum or a substitute for dietary guidance.
On that basis, a bar supplying 5.4g represents 27% of the standard saturated-fat reference intake.
A snack can fit into a balanced diet while still providing a sizeable share of a nutrient people are advised to moderate. Looking at the whole day's diet is more useful than treating any one bar as a moral test.
Does high protein automatically mean healthy?
No. Under EU Regulation 1924/2006, a high protein claim has a technical meaning: at least 20% of the food's energy must be provided by protein.
The claim describes a particular characteristic. It does not certify the entire product as healthy.
Two bars can both satisfy the rule while varying in:
- Total energy and portion weight.
- Fibre and ingredient sources.
- Added sugars, polyols and sweeteners.
- Saturated fat and salt.
- Allergens, including milk, soya, peanuts and tree nuts.
The relevant question isn't whether a brand is allowed to say high protein. It is whether the specific product fits what you need from a snack.
Read more: High Protein Doesn't Always Mean Healthy and How Much Protein Do You Actually Need Per Day?.
Are protein bars better than normal food after exercise?
Protein supports muscle maintenance and growth when consumed in adequate quantities alongside appropriate training.
A bar can be convenient after a workout, during travel or when food preparation isn't practical.
But it isn't automatically superior to a meal or snack containing ordinary protein-rich foods. Milk, yoghurt, eggs, fish, beans, meat, tofu and other foods can all contribute to daily protein intake.
Sports-nutrition guidance commonly discusses higher protein intakes for people undertaking consistent resistance training, but requirements depend on body size, training and goals.
A bar may help reach an appropriate daily intake; the bar itself does not guarantee improved training results.
What should you look for when buying a protein bar in Ireland?
1. Read protein per bar, not just the biggest number on the front
Check the actual portion. A 40g bar and a 60g bar are not directly interchangeable.
2. Read sugars and polyols together
A low-sugar bar may still contain a considerable amount of polyols. If you have experienced digestive symptoms, this may be especially relevant.
3. Check saturated fat
The protein figure can dominate attention, but 3 to 5g of saturated fat in one small snack is also meaningful information.
4. Consider fibre and its source
Some bars contain nuts or added fibre ingredients. Different fibres have different physiological effects, and tolerance varies.
5. Check allergens and age warnings
Milk, soya, nuts and peanuts may be ingredients or listed as possible cross-contact allergens. Some Grenade varieties carry an age restriction/warning for children under 14 in the retailer listing. Always check the actual pack before eating or serving.
6. Look at the whole meal
If the bar replaces a convenient afternoon snack, that context differs from adding several bars on top of an already sufficient diet.
7. Compare price after you compare the food
Pack price and promotions change. A larger bar or a discount multipack is not necessarily better value for the amount of protein, fibre or overall nutrition you want.
A few situations where your choice might differ
You want protein density: compare protein per bar and per 100 calories, without treating that ratio as a total health score.
You are sensitive to sugar alcohols: pay close attention to the polyol line and the ingredients; a bar with 18g polyols may be unsuitable for you despite its low sugar number.
You want a nut-based snack with fibre: a peanut-led bar may be more appealing, while still requiring a check of sugars and energy.
You have a milk or soya allergy: check the complete allergen declaration, not the front-of-pack claims.
You want something after training: a bar may be practical, but protein-rich ordinary foods are valid alternatives.
None of these scenarios establishes an absolute winner for everyone.
How Sláinte would approach protein bars
The Sláinte Score is intended to examine the product as a whole rather than awarding top marks for one headline nutrient.
The current published framework weights nutrition at 55%, ingredients at 30%, and processing and quality signals at 15%, with category-specific adjustments and limits where relevant. Protein may contribute positively within nutrition, while sugars, energy, saturated fat and salt also remain relevant. Additives are considered within the ingredient component, while processing is assessed separately.
That helps explain why a bar with 22g of protein is not automatically superior to every bar with less protein, and why a sweetener cannot be assessed responsibly without the full context of a product.
We have not assigned a Sláinte Score to the five bars in this article. Exact scores require verified records and the functioning scoring engine; any numerical ranking printed here without that would be fabricated.
Explore Sláinte or read how the scoring methodology works.
Frequently asked questions
Are Fulfil bars healthier than Grenade bars?
There is no defensible brand-wide answer. Flavours differ, serving sizes differ and individual priorities matter. For the selected varieties, inspect the per-bar table for protein, sugars, polyols and saturated fat rather than assuming a winner by brand name.
Why does a low-sugar protein bar contain sweeteners?
Manufacturers can use sweeteners or polyols to create sweetness without adding the same amount of sugars. Low declared sugars therefore do not mean an unsweetened product or a product without sweetening ingredients.
Are polyols the same as sugar?
No. Polyols are a distinct group of sweetening carbohydrates and are declared differently in EU nutrition information. They can contribute energy and may cause laxative effects at higher intakes in some people.
Is 20g of protein in one bar good?
It is a meaningful contribution to daily protein intake for many adults. Whether it is necessary or useful depends on the person's overall protein needs and what the rest of the diet supplies.
Can I eat a protein bar every day?
A protein bar can fit into a varied diet, but everyday suitability depends on the bar, portion and individual circumstances. Some products are high in polyols or saturated fat. Check warnings and do not treat bars as replacements for dietary variety.
Are protein bars suitable for children?
Not all products are. Some carry explicit age-related warnings, and adult-oriented products may contain ingredients or amounts that do not suit children. Check each pack and seek appropriate advice when necessary.
Is a protein bar better than a chocolate bar?
A protein bar may provide more protein or fibre, but some are also energy-dense or high in saturated fat. Compare actual products, not two very broad categories.
Does collagen count towards the protein number?
Hydrolysed collagen contributes to declared protein content, but its amino-acid profile differs from whey and casein. The label may not disclose how much protein comes from each source.
How do I know which product Sláinte recommends?
Check the product's verified Sláinte listing when available. This article does not substitute an estimated score or recommendation order for an actual scan.
The short version
- Protein ranged from 10.2g to 22g per bar in our five-product comparison.
- Bars differed in weight, so compare per bar and, where useful, per 100g.
- Low sugar does not mean no sweeteners or polyols.
- Some bars listed 13 to 18g of polyols per serving.
- Saturated fat ranged from 3.0g to 5.4g per bar.
- Fibre ranged from 2.4g to 4.4g per bar.
- Nuts, milk proteins, soya and collagen contribute differently to ingredients and nutrition.
- High protein is a regulated EU claim, not a complete verdict on health.
- A bar is a convenience food, not a requirement for exercise or muscle building.
- Check the current packet for ingredients, allergens and relevant warnings.
Sources
- Tesco Ireland, Grenade Carb Killa Chocolate Chip Salted Caramel 60g
- Tesco Ireland, Grenade Carb Killa Dark Chocolate Mint 60g
- Tesco Ireland, Fulfil Salted Caramel Vitamin Protein Bar 55g
- Tesco Ireland, Fulfil Chocolate Brownie Vitamin & Protein Bar 55g
- Tesco Ireland, Nature Valley Protein Peanut & Chocolate 4 × 40g
- EU, Regulation (EC) No 1924/2006
- EU, Regulation (EU) No 1169/2011
- EFSA, Food additives
- International Society of Sports Nutrition, Protein and exercise position stand
- Sláinte, Published scoring methodology
Last reviewed: 19 October 2026