Barebells vs ONE Protein Bars
Barebells and ONE are the two big dessert style protein bars: both deliver 20g of protein around the 1g sugar mark, both sweeten with maltitol and sucralose, and both compete on flavour names that sound like a bakery menu. The label differences are smaller here than in most matchups, which makes them worth reading closely. ONE runs slightly higher on calories but usually carries more fiber, and its protein blend skips the collagen that appears in most Barebells flavours. Every number below is transcribed from the manufacturer’s nutrition label and verified by hand, then compared across every flavour we have checked.
The numbers, side by side
Values are shown as the range across every flavour we have verified (18 Barebells Protein Bar flavours, 10 ONE Protein Bar flavours). Winner is decided on the median flavour.
| Per bar | Barebells Protein Bar | ONE Protein Bar |
|---|---|---|
| Protein per bar | 20g | 20g |
| Calories per bar | 200–220 kcalWinner | 210–240 kcal |
| Protein per 100 kcal | 9.1–10gWinner | 8.3–9.5g |
| Sugar per bar | 1–2g | 1g |
| Fiber per bar | 2–4g | 3–8gWinner |
| Fat per bar | 6–9g | 6–9gWinner |
| Bar size | 55g | 60g |
| Sugar alcohols | Maltitol | Maltitol |
| Other sweeteners | Sucralose | Sucralose |
| Protein sources | Caseinate, Whey Protein Isolate, Whey Protein Concentrate, Collagen | Milk Protein Isolate, Whey Protein Isolate, Milk Protein Concentrate, Hydrolysed Whey, Whey Protein Concentrate |
Ingredients worth noting
Barebells Protein Bar
- Glycerin: Chemically a sugar alcohol, used to keep bars soft and moist rather than to sweeten.
- Maltitol: A sugar alcohol that does raise blood glucose, with a glycaemic index around 35 where most polyols are near zero.
- Seed Oils: Refined oils high in omega-6 linoleic acid.
- Artificial Sweeteners: Synthetic zero-calorie sweeteners such as sucralose, acesulfame potassium and aspartame.
- Artificial Colours: Synthetic dyes.
ONE Protein Bar
- Glycerin: Chemically a sugar alcohol, used to keep bars soft and moist rather than to sweeten.
- Palm Oil: Palm oil is pressed from the fruit of the oil palm; palm kernel oil comes from the seed inside that same fruit.
- Maltitol: A sugar alcohol that does raise blood glucose, with a glycaemic index around 35 where most polyols are near zero.
- Seed Oils: Refined oils high in omega-6 linoleic acid.
- Artificial Sweeteners: Synthetic zero-calorie sweeteners such as sucralose, acesulfame potassium and aspartame.
- Maltodextrin: A rapidly digested glucose polymer made from corn, rice or tapioca starch.
- Cellulose Gum & Gel: Cellulose-based thickeners: cellulose gum (carboxymethylcellulose) and cellulose gel (microcrystalline cellulose), often used together in shakes.
Where they rank
Barebells Protein Bar
- #8 of 42 in Highest Protein Bars Per Calorie
- #8 of 10 in Protein Bars Without Seed Oils
- #9 of 10 in Best Protein Bars
- #9 of 10 in Low Sugar Protein Bars
- #9 of 9 in Best Protein Bars for GLP-1 Users
- #9 of 9 in Best Protein Bars for Ozempic Users
- #9 of 9 in Best Protein Bars for Mounjaro & Zepbound Users
ONE Protein Bar
- #7 of 10 in Low Sugar Protein Bars
- #10 of 10 in Best Protein Bars
- #11 of 42 in Highest Protein Bars Per Calorie
Frequently asked questions
- Which has more protein per calorie, Barebells Protein Bar or ONE Protein Bar?
- Barebells Protein Bar, with 9.5g of protein per 100 calories against 9.1g for ONE Protein Bar (median across all verified flavours).
- Which has more fiber, Barebells Protein Bar or ONE Protein Bar?
- ONE Protein Bar, with 3–8g of fiber per bar against 2–4g for Barebells Protein Bar.
- Do Barebells Protein Bar and ONE Protein Bar contain sugar alcohols?
- Barebells Protein Bar: Maltitol. ONE Protein Bar: Maltitol. This comes from the verbatim ingredient list of every flavour we have verified.
Every Barebells Protein Bar flavour we have verified
Banana Bread20g protein · 220 kcal · 9.1g / 100 kcal
Birthday Cake20g protein · 210 kcal · 9.5g / 100 kcal
Brownie Batter20g protein · 210 kcal · 9.5g / 100 kcal
Caramel Cashew20g protein · 200 kcal · 10g / 100 kcal
Chocolate Dough20g protein · 200 kcal · 10g / 100 kcal
Coco Caramel Almond20g protein · 210 kcal · 9.5g / 100 kcal
Cookies & Caramel20g protein · 210 kcal · 9.5g / 100 kcal
Cookies & Cream20g protein · 200 kcal · 10g / 100 kcal
Creamy Crisp20g protein · 200 kcal · 10g / 100 kcal
Key Lime Pie20g protein · 200 kcal · 10g / 100 kcal
Lemon Cheesecake20g protein · 210 kcal · 9.5g / 100 kcal
Mint Chocolate Crisp20g protein · 210 kcal · 9.5g / 100 kcal
Orange Creamsicle20g protein · 210 kcal · 9.5g / 100 kcal
Peanut Butter20g protein · 210 kcal · 9.5g / 100 kcal
Peanut Butter & Jelly20g protein · 200 kcal · 10g / 100 kcal
Salty Peanut20g protein · 200 kcal · 10g / 100 kcal
White Chocolate Almond20g protein · 200 kcal · 10g / 100 kcal
Wild Cherry20g protein · 210 kcal · 9.5g / 100 kcalEvery ONE Protein Bar flavour we have verified
Birthday Cake20g protein · 220 kcal · 9.1g / 100 kcal
Blueberry Cobbler20g protein · 210 kcal · 9.5g / 100 kcal
Chocolate Almond Bliss20g protein · 240 kcal · 8.3g / 100 kcal
Chocolate Chip Cookie Dough20g protein · 220 kcal · 9.1g / 100 kcal
Cinnamon Roll20g protein · 230 kcal · 8.7g / 100 kcal
Fruity Cereal20g protein · 210 kcal · 9.5g / 100 kcal
Lemon Cake20g protein · 220 kcal · 9.1g / 100 kcal
Maple Glazed Doughnut20g protein · 220 kcal · 9.1g / 100 kcal
Peanut Butter Cup20g protein · 220 kcal · 9.1g / 100 kcal
S'mores20g protein · 210 kcal · 9.5g / 100 kcalAll numbers on this page are transcribed from each manufacturer’s published nutrition label and verified by hand, then compared across every flavour in our database. If you are tracking a daily protein target, the Protein Pal app lets you scan either bar and log it in seconds. See everything from Barebells Protein Bar and ONE Protein Bar, or browse all rankings and brands.
