Best Protein Bars (2026): 137 Checked for Protein, Sugar, Cost
Our pick is Quest Lemon Cake: $1.83 a bar, 20 g of protein, 1 g of sugar. Only 19 of 137 bars have 20 g of protein or more, 5 g of sugar or less, no maltitol or sorbitol, and no collagen counted as protein.
By Erin Rose Updated November 5, 2026 How we score
Our pick: the best protein bar for most people
- Protein
- 20 g11.8 g per 100 calories
- Sugar
- 1 g170 calories a bar
- A bar
- $1.83$21.99 on Amazon
- Our score
- 95 of 100ranked #1 of 137
Why we pick it It has 13 g of fiber. Sweetened with sucralose and erythritol. A box holds 12 bars. 11 of 14 Quest flavors pass all four checks, so pick the flavor you like. Its 1 g of sugar ties for the lowest of the 19 bars that pass. Its 170 calories tie for the fewest of the 19 bars that pass.
Best protein bar for your goal
Quest Lemon Cake suits most people. If one thing matters more to you, buy the bar that wins it. Every bar below passes all four label checks, except the one marked as a trade-off. Costs are for 20 g of protein, so you can compare bars of different sizes.
Cheapest popular bar that passes: Pure Protein Lemon Cake
$1.31 per 20 g of protein, the lowest of the 10 popular bars (top 200 in Amazon’s protein bar sales rank) that pass all four checks. The median of all 137 bars is $2.37.
Pure Protein Lemon Cake
Protein 20 g, sugar 2 g, fiber 4 g, 190 calories. $1.31 a bar, $1.31 per 20 g of protein.
Label: USDA 2023-11-16
Most protein, with a trade-off: David Protein Bar Chocolate Chip Cookie Dough
28 g of protein a bar, the most of the 21 popular bars (top 200 in Amazon’s protein bar sales rank). It fails 2 of the four checks: collagen counted as protein and maltitol or sorbitol. Among the bars that pass all four, the most is 21 g.
David Protein Bar Chocolate Chip Cookie Dough
Protein 28 g, sugar 0 g, fiber not listed, 150 calories. $3.25 a bar, $2.32 per 20 g of protein.
Label: Maker label 2026-10-18
Best vegan bar that passes: No Cow Chunky Peanut Butter Vegan
Vegan, with a score of 86 of 100, the top of the 4 vegan bars that pass all four checks. It also has the most fiber of the bars that pass, at 17 g.
No Cow Chunky Peanut Butter Vegan
Protein 21 g, sugar 1 g, fiber 17 g, 190 calories. $2.75 a bar, $2.62 per 20 g of protein.
Label: USDA 2023-01-26
No sugar alcohols: KIND Protein MAX Dark Chocolate Crisp
No sugar alcohol on its label or in the sweeteners we read. 2 of the 19 bars that pass can say that.
KIND Protein MAX Dark Chocolate Crisp
Protein 20 g, sugar 1 g, fiber 9 g, 240 calories. $1.28 a bar, $1.28 per 20 g of protein.
Label: Amazon listing photo
How the popular brands score
These are the brands people search for most. Each row opens with how many of the brand’s flavors pass, then shows one bar.
Barebells: 0 of 5 flavors pass (collagen and maltitol)
Its top-scoring bar is Barebells Cookies & Cream (rank 57 of 137). It fails: collagen counted as protein and maltitol or sorbitol.
Barebells Cookies & Cream
Protein 20 g, sugar 1 g, fiber 3 g, 200 calories. $2.33 a bar, $2.33 per 20 g of protein.
Label: USDA 2023-09-14
Quest: 11 of 14 flavors pass (under 20 g of protein)
Its top-scoring bar, Quest Lemon Cake, is shown above, so here is another one: Quest Double Chocolate Chunk (rank 2 of 137). It passes all four checks.
Quest Double Chocolate Chunk
Protein 20 g, sugar 1 g, fiber 12 g, 170 calories. $2.00 a bar, $2.00 per 20 g of protein.
Label: USDA 2023-11-16
RXBAR: 0 of 3 flavors pass (over 5 g of sugar and under 20 g of protein)
Its top-scoring bar is RXBAR Chocolate Sea Salt (rank 128 of 137). It fails: only 12 g of protein and 14 g of sugar.
RXBAR Chocolate Sea Salt
Protein 12 g, sugar 14 g, fiber not listed, 200 calories. $1.75 a bar, $2.92 per 20 g of protein.
Label: Label not public
Top 10 protein bars by our score
Prices checked November 5, 2026. Our score out of 100 counts protein for the calories, sugar, cost, fiber, sweeteners and collagen. How the score works. Each label link opens the USDA record or the maker’s label. See all 137 bars in the protein bar database.
See all 137 bars in the protein bar database. Re-rank by protein, sugar or cost, filter by brand, compare two bars, or download the CSV.
The four label checks
Only 19 of 137 bars we checked pass all four. A bar that passes gives you a full serving of real protein without much sugar or a sweetener likely to upset your stomach.
- 20 g of protein or more. In young men who lift, 20 g of whey at one time was enough for close to the full muscle-repair response, and 40 g added a little more (Witard 2014). The International Society of Sports Nutrition suggests 20 to 40 g a meal.
- 5 g of sugar or less. A bar with 15 to 30 g of sugar is closer to a candy bar.
- No collagen counted as protein. Collagen is missing tryptophan, one of the essential amino acids, so it is an incomplete protein (Paul 2019). US labels count collagen in the protein grams and do not say how much of the protein it is. Collagen is not harmful, but it is low in leucine and the other amino acids that drive muscle repair (Jäger 2017), so its grams do less for muscle than milk, egg or soy protein.
- No maltitol or sorbitol. These sugar alcohols are the ones most likely to cause gas, bloating and loose stools (Mäkinen 2016).
Two more things on the label
“Net carbs” is the brand’s own math. US labels do not define it. Brands subtract fiber and sugar alcohols from total carbs, so compare total carbohydrate, fiber and sugar instead.
Check that the serving is one bar. A few labels list the numbers for a two-bar pack, which makes protein and calories hard to compare.
Is erythritol safe?
The research is not settled. In a 2023 study of about 4,000 people sent for heart testing, those with the most erythritol in their blood had about twice the rate of heart attack, stroke or death over 3 years as those with the least, and erythritol made blood platelets clump more easily in the lab (Witkowski 2023). That shows a link, not proof that erythritol caused the problems. Most people in the study already had heart disease or its risk factors. That makes the result most important for people like them. The authors called for long-term safety studies. If you have heart disease or have had a stroke or blood clot, check the sweeteners on a bar before you buy it.
Our pick, Quest Lemon Cake, contains erythritol. 17 of the 19 bars that pass all four checks contain it. The 2 that do not are:
- KIND Protein MAX Dark Chocolate Crisp: no erythritol, but 70 more calories (240), less fiber (9 g) and it sells less (not in Amazon’s top 200 protein bars). See its row
- CLIF High Protein Cinnamon French Toast: no erythritol, but 100 more calories (270), 5 g of sugar against 1 g, less fiber (5 g) and it sells less (not in Amazon’s top 200 protein bars). Check price on Amazon
Common questions about protein bars
What is the best protein bar?
Quest Lemon Cake, for most people. It has 20 g of protein and 1 g of sugar, costs $1.83 a bar, and passes all four label checks. It is one of 19 of 137 bars that do.
How many protein bars have 20 g of protein and little sugar?
19 of 137 bars reach 20 g of protein with 5 g of sugar or less and also pass the collagen and sweetener checks. 72 of 137 reach 20 g of protein, and 84 of 137 have 5 g of sugar or less. See all 137 in the protein bar database.
Why do some protein bars upset my stomach?
Usually the sugar alcohols. Maltitol and sorbitol are not fully absorbed, so they can cause gas, bloating and loose stools, mostly in people not used to them. 54 of 137 bars we checked use one of them. Erythritol rarely does (Mäkinen 2016). Large amounts of added fiber can cause gas too.
Do protein bars use collagen to reach their protein number?
Some do. 27 of 137 bars count collagen toward their protein grams. Collagen is an incomplete protein, so we flag these bars in the database with “contains collagen”.
Are protein bars good for weight loss?
They can help if one replaces a less filling snack. In a small trial in women, a 160-calorie high-protein yogurt eaten in the afternoon eased hunger and led to a smaller dinner than 160 calories of chocolate (Ortinau 2014). That study did not test bars. A bar does not burn fat on its own; total calories still decide weight loss.
Is it OK to eat a protein bar every day?
For most people, yes, if it fits your calories and you still eat whole foods. Pick one that passes our checks, so you are not adding sugar or a sweetener that upsets your stomach every day. If you have kidney disease, ask your doctor how much protein is right for you.
Are protein bars OK if you have diabetes?
Often, yes, if you pick one low in sugar. 84 of 137 bars we checked have 5 g of sugar or less. Look at total carbs and fiber too, and ask your doctor or dietitian how a bar fits your plan, especially if you take insulin or a drug that can cause low blood sugar.
What is the cheapest protein bar per gram of protein?
Pure Protein Lemon Cake is the cheapest popular bar that passes all four checks, at $1.31 per 20 g of protein. The median bar in our database costs $2.37 per 20 g. Prices were checked November 5, 2026.
Can a protein bar replace a meal?
Now and then, not every day. Bars in our database run from 80 to 410 calories, which is usually less than a meal, and a meal usually adds vegetables, fruit and variety that a bar does not.
How we checked
We read each bar’s nutrition facts and ingredients from its USDA FoodData Central record (65 bars, release of October 29, 2026) or the maker’s label (72 bars), and priced each box on Amazon on November 5, 2026. 134 of the 137 link to the record or label. Download all 137 bars (CSV). Makers sometimes change recipes, so a newer box can differ from the label we read.
Sources
- USDA FoodData Central, Branded Foods, release of October 29, 2026. fdc.nal.usda.gov
- US Food and Drug Administration. “Changes to the Nutrition Facts Label.” fda.gov
- Witard OC, et al. “Myofibrillar muscle protein synthesis rates subsequent to a meal in response to increasing doses of whey protein at rest and after resistance exercise.” Am J Clin Nutr. 2014. PubMed 24257722
- Jäger R, et al. “International Society of Sports Nutrition Position Stand: protein and exercise.” J Int Soc Sports Nutr. 2017. PubMed 28642676
- Paul C, et al. “Significant Amounts of Functional Collagen Peptides Can Be Incorporated in the Diet While Maintaining Indispensable Amino Acid Balance.” Nutrients. 2019. PubMed 31096622
- Mäkinen KK. “Gastrointestinal Disturbances Associated with the Consumption of Sugar Alcohols with Special Consideration of Xylitol.” Int J Dent. 2016. PubMed 27840639
- Witkowski M, et al. “The artificial sweetener erythritol and cardiovascular event risk.” Nat Med. 2023. PubMed 36849732
- Ortinau LC, et al. “Effects of high-protein vs. high-fat snacks on appetite control, satiety, and eating initiation in healthy women.” Nutr J. 2014. PubMed 25266206