Joybuy Insights

Choosing protein bars: how to compare protein, sugar and ingredients

A protein bar might seem like a straightforward purchase at first. But protein bars can vary considerably in their protein content, sugar, sweeteners, serving size and allergens. Eye-catching packaging or a “high protein” claim doesn’t tell the whole story. If you only look at the front of the pack, you could end up with a snack made mostly of syrup, chocolate and sweeteners.

For sportspeople, fitness enthusiasts and active adults, there are three common pitfalls:

  • Confusing protein per 100 g with protein per bar. A 55 g bar with 20 g of protein is not the same as 20 g of protein per 100 g.
  • Assuming “low sugar” means few sweeteners. Many protein bars contain polyols such as maltitol or sorbitol. According to the product information, consuming a large amount may have a laxative effect.
  • Skipping the allergen list. Milk, soya, peanuts, nuts, gluten and collagen are common ingredients. Always check the latest label, especially if the recipe may have changed.

Which specifications should you check?

1. Protein per serving

First, check how many grams of protein there are per bar. After a workout, many people look for around 15 to 25 g of protein per serving. This isn’t a requirement for every snack, but it’s a useful way to compare them.

Check the source of the protein, too. Many bars use whey, milk protein, casein or soya protein. Others contain hydrolysed collagen. If you prefer a particular protein source, check the ingredients list rather than relying on the front of the pack.

2. Sugar, carbohydrates and polyols

A low-sugar protein bar can still contain relatively high amounts of carbohydrates, fat or sweeteners. So compare:

  • sugar per bar;
  • total carbohydrates;
  • polyols, such as maltitol and glycerol;
  • energy per serving.

For example, XXL Nutrition N’Joy Chocolate Caramel lists 2.6 g of sugar and 26 g of polyols per 55 g. Barebells Protein Salty Peanut lists 2.7 g of sugar per 55 g. These figures are more useful than a general claim on the front of the pack.

3. Fibre, allergens and size

A high-protein snack with added fibre can be a practical choice between meals. Do check the serving size, though: nutritional values per 100 g can make it difficult to compare small and large bars.

Also check which allergens are highlighted in bold on the label. The products in this guide include milk, soya, peanuts, almonds, hazelnuts, gluten and oats. If you avoid lactose, milk protein or animal-derived ingredients, take extra care when checking. Product information can change, so the label on the pack is the one to follow.

Our recommendations for different needs

Suitable for: Budget-conscious beginners
Liga Protein Bar Cranberry - 160 g

Liga Protein Bar Cranberry - 160 g

Why it suits this profile: An accessible snack for anyone new to sports nutrition who wants a bar to take to work, school or on the go. The product information lists 14 g of protein and 3.5 g of fibre per 100 g.

How this product helps you avoid the pitfall

The nutritional information makes clear that this isn’t a very high-protein fitness bar per serving. That makes it easier to compare fairly with regular cereal and snack bars.

Key benefit & highlights

A source of protein and fibre according to the product description, with a crunchy texture and cranberry and hazelnut. It does contain 28 g of sugar per 100 g.

Suitable for: Shoppers looking for premium quality
Barebells Protein White Chocolate Almond - 55 g

Barebells Protein White Chocolate Almond - 55 g

Why it suits this profile: A good choice if you’re looking for a compact protein bar with a distinctive, dessert-like flavour and relatively little sugar.

How this product helps you avoid the pitfall

The figures list 2.2 g of sugar per 55 g bar, 36 g of protein per 100 g and 7 g of fibre per 100 g. This makes the key figures easy to check.

Key benefit & highlights

36 g of protein and 2.2 g of sugar per 100 g according to the product information, with a white chocolate and almond flavour. Contains milk, soya and almonds.

Suitable for: Specific needs & frequent users
Grenade Carb Killa High Protein Bars Birthday Cake

Grenade Carb Killa High Protein Bars - Birthday Cake, 12 x 60 g

Why it suits this profile: A multipack of individually wrapped bars to keep in your gym bag, take on your commute or enjoy as a regular post-workout snack.

How this product helps you avoid the pitfall

The product information lists more than 20 g of protein and 1.6 g of sugar per bar. Do check the polyol warning and the milk and collagen content.

Key benefit & highlights

Each individually wrapped bar weighs 60 g. The description lists three layers of nougat, vanilla filling and white chocolate. Contains milk and beef collagen.

Suitable for: A protein snack on the go
Nutramino XL Protein Bar Chocolate Caramel

Nutramino XL Protein Bar 74G Chocolate Caramel

Why it suits this profile: A larger bar for adults who want a filling snack to take along for between meals or after an intense workout.

How this product helps you avoid the pitfall

The serving is clearly listed as 74 g, with 25 g of protein. So you can see at a glance that it’s a larger bar, which may also provide more calories and carbohydrates.

Key benefit & highlights

25 g of protein per bar, with a soft centre, soya crispies and milk chocolate according to the product description. Contains milk and soya, and lists 19 g of sugar per bar.

Looking for more options?

We’ve put together a complete, up-to-date list of products that meet these strict selection criteria and the applicable European safety regulations.

Frequently asked questions about protein bars

When should you eat a protein bar after working out?

It depends on your overall diet and when you train. A bar can be a convenient option after a workout or between meals when a regular meal isn’t readily available. Check the serving size, protein content and sugar per product. A protein bar isn’t a substitute for a varied diet.

Are low-sugar protein bars automatically a good choice?

No. “Low sugar” tells you nothing about the amount of fat, calories, carbohydrates or polyols. So read the full nutritional information table. If you have a sensitive digestive system, it’s a good idea to follow the warning about sweeteners and the recommended amount.

How should you store a protein bar?

Store most bars in a cool, dry place, away from direct sunlight, heat and moisture. Keep the wrapper sealed until you’re ready to eat the bar, and don’t consume it if the packaging is damaged. Always check the use-by date and the latest label before buying and eating a product.