Fibre Boost Raw, Cold Pressed, Flavoured Protein Bar Birthday Cake
Fibre Boost Raw, Cold Pressed, Flavoured Protein Bar Birthday Cake: independently scored 10.0/10 on Protein Score and 9.9/10 on Clean Score by ProteinScore.
21.6g protein per serve · 137 cal · 0.2g sugar · 52mg sodium · 60g serve.
Overview
This bar sits at the top of the protein bar category, outperforming the average on almost every metric. The headline numbers are sharp, but the fibre content is the other story here. At 45 grams of fibre per 100g, it's one of the most fibre-dense bars we've seen, a result of its corn-based prebiotic fibre foundation. The ingredient list is refreshingly short for a packaged snack. With just seven items, it avoids the gums, stabilisers, and artificial colours common in the category. This is well below the category average of 22 ingredients we track, signalling a less-processed approach to formulation that relies on the quality of the core ingredients. Compared with the brand's Choc Malt version, this Birthday Cake flavour delivers 0.3g more protein per 100g for the same tiny amount of sugar. This reflects a consistent pattern across the Fibre Boost range: high protein from quality whey and milk sources, extremely low sugar using stevia, and a focus on prebiotic fibre. As a cold-pressed bar, the texture is dense and chewy, not light or cake-like. It's a functional format designed for a quick, clean hit of protein and fibre. We see it as a gym-bag staple or a planned afternoon snack, rather than an impulse grab.
Protein Score: 10.0/10
Whey and milk protein isolates are the powerhouses behind this bar's protein density, delivering a huge 21.6 grams of protein in a single 60g serve. That performance, combined with an exceptional 15.8 grams of protein per 100 calories, earns it a 10/10. This bar comfortably clears the 20-gram threshold we expect from a dedicated protein bar, putting it well ahead of the typical product in this category. It leaves standard muesli bars, which often contain just 2-5 grams of protein, far behind. The protein hit is efficient and direct, with very few calories spent on sugar or fat. For anyone tracking their macros closely, this bar offers a reliable and significant contribution to a daily protein target without derailing a calorie budget.
Clean Score: 9.9/10
Fibre Boost consistently delivers products with short, understandable ingredient lists, and this bar is no exception. A clean list of just seven ingredients, with only steviol glycosides (E960) as a natural sweetener, gives this bar a Clean Score/10, placing it far ahead of the category average. With no artificial sweeteners, colours, preservatives, or emulsifiers, it sidesteps the additives that inflate ingredient counts on many other bars. The average protein bar on our list has 22 ingredients; this one has a third of that, which speaks to a deliberate, less-is-more formulation. The trade-off for such a clean profile is often texture. Cold-pressed bars held together with fibre and protein tend to be denser and chewier than baked bars that use gums and emulsifiers for a softer mouthfeel. It's a functional format for those who prioritise a clean ingredient panel over a more processed, confectionary-style texture.
Wins
- A huge 21.6g of protein in a single 60g bar.
- Just seven ingredients and no artificial sweeteners.
- Extremely low sugar, with only 0.2g per serve.
Watch outs
- Dense, cold-pressed texture may not suit all tastes.
- High fibre content from corn may be new for some.
- Relies on natural flavours for its 'Birthday Cake' taste.
Ingredients
Soluble Prebiotic Fibre (Corn), Whey Protein Isolate (Milk), Milk Protein Isolate, Almonds, Natural Flavour, Sweetener (Steviol Glycosides), Salt.
7 ingredients.
Frequently asked questions
- Is this bar filling enough for a snack?
- Yes, in our view this is a very filling snack for its size. The bar contains an exceptionally high 45g of fibre per 100g, which comes from its primary ingredient, soluble prebiotic corn fibre. High-fibre foods are known to contribute to satiety, helping you feel fuller for longer. Combined with over 21 grams of protein, it delivers a powerful one-two punch for staving off hunger. We'd consider it a substantial snack, not a light bite.
- Is this better as a pre- or post-workout snack?
- We'd position this bar as a post-workout refuel. Its main job is delivering a big, 21.6-gram hit of high-quality whey and milk protein, which is ideal for muscle repair after exercise. While you could have it beforehand, the high fibre content might be uncomfortable for some during an intense training session. For post-workout recovery, however, the high protein-per-calorie ratio makes it one of the most efficient options in the bar aisle.
- How does the Birthday Cake flavour compare to others in the Fibre Boost range?
- This flavour sits at the highest end of the brand's protein offerings. Compared with the Fibre Boost Choc Malt bar, for instance, the Birthday Cake version has slightly more protein (36.1g vs 35.8g per 100g) and the exact same low sugar content. This pattern holds true across the range, where all flavours offer a similar high-protein, low-sugar profile. The main difference comes down to your personal flavour preference.
- What kind of protein does this bar use?
- This bar uses a blend of whey protein isolate and milk protein isolate. These are high-quality, dairy-based proteins known for their complete amino acid profiles and fast absorption, which is why they are popular in post-workout products. Unlike plant-based proteins or collagen, whey and milk isolates are specifically chosen for their muscle-building and recovery properties. This choice of protein source is key to the bar achieving its high protein density.
- How does this bar achieve such a high Protein Score?
- Our Protein Score prioritises protein density, not just the total grams. This bar excels on two fronts: it delivers a very high 21.6g of protein per serve, and it does so in just 137 calories. That works out to 15.8g of protein for every 100 calories consumed, which is an exceptional ratio. Many other bars use more calories from sugars and fats to achieve their protein count, so this bar's efficiency is what places it at the top of the rankings.