10 Worst Protein Bars at Costco in 2026

⚠️ We analyzed protein bars available at Costco and ranked them by ingredient safety score. Here are the worst options based on real ingredient data.

#ProductBrandScoreAdditivesSeed Oils
1 Chi lately Chunks Cookie Dough Protein Bar Kirkland Signature 49/100 4 3
2 PEANUT BUTTER & SEMISWEET CHOCOLATE CHIP CHEWY PROTEIN BARS, PEANUT BUTTER & SEMISWEET CHOCOLATE CHIP Costco Companies Inc. 49/100 4 3
3 CHOCOLATE PEANUT BUTTER CHUNK PROTEIN BAR, CHOCOLATE PEANUT BUTTER CHUNK Costco Companies Inc. 74/100 None None
4 Chocolate Brownie Protein Bar Kirkland 90/100 1 2

See also: Healthiest Protein Bars at Costco

How We Rank Protein Bars at Costco

Our rankings analyze every ingredient in each product against a database of 500+ additives, preservatives, artificial colors, seed oils, and allergens. Each product gets a score from 0 to 100:

Frequently Asked Questions

What are the worst protein bars at Costco?
Based on our ingredient analysis, the #1 worst protein bars at Costco is Chi lately Chunks Cookie Dough Protein Bar by Kirkland Signature with a score of 49/100.
How many protein bars at Costco did you test?
We analyzed protein bars products available at Costco, scoring each for additives, seed oils, allergens, and overall ingredient safety.
How often are these rankings updated?
Rankings are updated as new products are scanned and added to our database. All scores reflect the current formulation of each product.

More Rankings

TargetWalmartTrader Joe'sWhole FoodsSnacksCerealsYogurtBread
Download CheckIt AI Free →

Explore More

📊 Costco Report Card🔄 Healthier Swap Finder🏷️ Brand Scorecards🏪 All Store Report CardsIs Chi lately Chunks Cookie Dough Protein Bar Healthy?Is PEANUT BUTTER & SEMISWEET CHOCOLATE CHIP CHEWY PROTEIN BARS, PEANUT BUTTER & SEMISWEET CHOCOLATE CHIP Healthy?Is CHOCOLATE PEANUT BUTTER CHUNK PROTEIN BAR, CHOCOLATE PEANUT BUTTER CHUNK Healthy?

Scanner Apps

Gluten Scanner AppDairy Scanner AppSeed Oil Scanner AppPeanut Allergy Scanner AppADHD Food Scanner AppIBS Food Scanner AppPregnancy Food Scanner AppCarnivore Diet Scanner AppKeto Scanner AppPaleo Scanner AppVegan Scanner AppCeliac Scanner AppMigraine Food Scanner AppKidney Diet Scanner AppCrohn's Food Scanner AppThyroid Scanner AppPCOS Food Scanner AppGout Food Scanner AppEczema Food Scanner AppToddler Food Scanner AppHeart Health Scanner AppAthlete Nutrition Scanner AppAcne Food Scanner AppFODMAP Scanner AppAIP Scanner AppMold Toxin Scanner AppHistamine Scanner AppOxalate Scanner AppNightshade Scanner AppSoy Scanner AppCorn Scanner AppEgg Allergy Scanner AppTree Nut Scanner AppShellfish Allergy Scanner AppSulfite Scanner AppSalicylate Scanner AppLectin Scanner AppSugar-Free Scanner AppLow Sodium Scanner AppMediterranean Diet Scanner AppWhole30 Scanner AppDiabetic Food Scanner AppColitis Food Scanner AppIC Food Scanner AppLupus Food Scanner AppHashimoto's Scanner AppEndometriosis Food Scanner AppAutoimmune Food Scanner AppBaby Formula Scanner AppPet Food Scanner AppSenior Nutrition Scanner AppOzempic Food Scanner AppWegovy Food Scanner AppMounjaro Food Scanner AppUltra-Processed Food ScannerHalal Food Scanner AppKosher Food Scanner AppAnti-Inflammatory Scanner AppCandida Diet Scanner AppSIBO Food Scanner AppLeaky Gut Scanner AppCholesterol Food Scanner AppBlood Pressure Scanner AppWeight Loss Food Scanner AppPesticide Food Scanner AppHeavy Metal Scanner AppPFAS Food Scanner AppBreastfeeding Food Scanner AppAutism Food Scanner AppFertility Food Scanner AppGAPS Diet Scanner AppElimination Diet Scanner AppLow Carb Scanner AppNanny Food Scanner AppGrocery Store Scanner AppFood Allergy Scanner AppDye-Free Food Scanner AppMuscle Building Scanner AppMarathon Runner Scanner AppKids Food Scanner AppFood Sensitivity Scanner AppClean Label Scanner AppFSA/HSA Food Scanner AppWhole Food Scanner AppDog Food Scanner AppCat Food Scanner App

Ingredient Safety

Red 40Yellow 5Yellow 6AspartameBHABHTSodium NitriteCarrageenanSucraloseTitanium DioxidePotassium BromateHigh Fructose Corn SyrupMSGSodium BenzoateTBHQPolysorbate 80Red 3Caramel ColorSoy LecithinNatural FlavorsAcesulfame-KMaltodextrinXanthan GumGuar GumCitric AcidErythritolBlue 1Propyl GallateMono & DiglyceridesPectinAcacia GumAgarAnnattoAutolyzed YeastAzodicarbonamideBVOCalcium PropionateCarnauba WaxCelluloseDATEMDisodium InosinateGellan GumKonjacLocust Bean GumMethylcelluloseSodium AlginateSodium Aluminum PhosphateTragacanth Gum

Food Safety Answers

Is Red 40 Banned in Europe?What Foods Have Seed Oils?Is Carrageenan Safe?Worst Food AdditivesIs BHA Safe?Does Gatorade Have Food Dye?Titanium Dioxide in FoodIs Aspartame Safe?Is Sodium Nitrite Dangerous?Is MSG Bad for You?What Is HFCS?Is Sucralose Safe?Food Dye Banned in Europe?Is Potassium Bromate Banned?What Is Natural Flavors?Is Soy Lecithin Bad?Is Maltodextrin Bad?Is Xanthan Gum Safe?Is Red 3 Banned?Is TBHQ Bad?Foods Banned in Other CountriesIs Citric Acid Bad?What Is Polysorbate 80?Is Caramel Color Safe?Is Palm Oil Bad?What Is Cellulose in Food?Is Acesulfame-K Safe?Is Erythritol Safe?Is Guar Gum Safe?Is Food in America Safe?Cheerios & PesticidesBest Food Scanner AppHow to Read Food LabelsIs Yellow 5 Safe?Are Preservatives Bad?Artificial Sweetener SafetyIs Canola Oil Bad?Hidden Names for SugarFoods That Cause InflammationIs Annatto Safe?Is Azodicarbonamide Safe?Is Calcium Propionate Safe?Is Carnauba Wax Safe?Is Gelatin Halal?Is Locust Bean Gum Safe?Mono & Diglycerides SafetyIs Pectin Safe?Propylene Glycol in FoodWhat Is Agar Agar?What Is BVO?What Is DATEM?What Is Sodium Alginate?What Is Sodium Benzoate?

Cleanest Rankings

Cleanest Protein BarsCleanest CerealCleanest YogurtCleanest ChipsCleanest SnacksCleanest BreadCleanest SaucesCleanest JuiceCleanest CookiesCleanest CandyCleanest Ice CreamCleanest PastaCleanest Baby FoodCleanest Energy DrinksCleanest Protein PowderCleanest Frozen MealsCleanest CondimentsCleanest SodaCleanest Pet Food

Free-From Finder

Protein Bars Without Seed OilsCereal Without Artificial ColorsSnacks Without PreservativesYogurt Without Artificial SweetenersChips Without Seed OilsCookies Without Artificial ColorsCandy Without Artificial ColorsSoda Without Artificial SweetenersFrozen Meals Without MSGBaby Food Without SugarEnergy Drinks Without SweetenersProtein Bars Without SweetenersSnacks Without Seed OilsCereal Without SugarBread Without PreservativesIce Cream Without CarrageenanPasta Without Gluten

Store Scan Results

Costco Protein Bars RankedWalmart Cereal RankedTarget Snacks RankedWhole Foods Yogurt RankedKroger Bread RankedAldi Snacks RankedCostco Snacks RankedWalmart Chips RankedTarget Cookies RankedTrader Joe's Snacks RankedWhole Foods Bread RankedWalmart Juice RankedTarget Cereal RankedWalmart Bread RankedKroger Snacks RankedAldi Cereal RankedWhole Foods Snacks RankedKroger Cereal RankedAldi Bread RankedTrader Joe's Cereal RankedCostco Bread Ranked

Ingredient Comparisons

Red 40 vs Yellow 5Red 40 vs Yellow 6Aspartame vs SucraloseAspartame vs HFCSBHA vs BHTRed 40 vs AspartameCarrageenan vs Soy LecithinSucralose vs HFCSTBHQ vs BHATBHQ vs BHTRed 40 vs Titanium DioxideRed 40 vs Caramel ColorMSG vs Natural FlavorsSodium Benzoate vs Potassium BromateYellow 5 vs Red 3Polysorbate 80 vs CarrageenanXanthan Gum vs Guar GumRed 40 vs Red 3Erythritol vs SucraloseMaltodextrin vs HFCSAll Ingredient Comparisons

Store Reports

Walmart Report CardTarget Report CardCostco Report CardKroger Report CardWhole Foods Report CardTrader Joe's Report CardAldi Report CardSam's Club Report Card

Original Research

All Research StudiesGrocery Product Safety StudySeed Oil CensusSafest Grocery StoresSchool Lunch Safety ReportMost Common AdditivesBanned Ingredients in US Products

App Comparisons

CheckIt vs YukaCheckIt vs EWGCheckIt vs FooducateCheckIt vs MyFitnessPalCheckIt vs Think DirtyCheckIt vs FigCheckIt vs SooseeCheckIt vs NoomYuka vs EWGYuka vs Fooducate

Guides & Tools

Download CheckIt AIUser ReviewsFood RecallsBanned in EuropeFood Safety ReportIngredient GlossaryStore RankingsIngredient EncyclopediaHealthier Swap FinderOur MethodologyIngredient ComparisonsTopic GuidesAll Food Safety AnswersOpen DataWhat's Really In Your Food
📋 Cite This Data
APACheckIt AI. (2026). "10 Worst Protein Bars at Costco in 2026 — Ranked by Ingredient Safety | CheckIt AI". Climaverse PBC. Retrieved from https://getcheck.it/worst/protein-bars-at-costco
MLA"10 Worst Protein Bars at Costco in 2026 — Ranked by Ingredient Safety | CheckIt AI." CheckIt AI, Climaverse PBC, 2026-03-05. https://getcheck.it/worst/protein-bars-at-costco.
HTML Embed<a href="https://getcheck.it/worst/protein-bars-at-costco">10 Worst Protein Bars at Costco in 2026 — Ranked by Ingredient Safety | CheckIt AI — CheckIt AI</a>
BibTeX@misc{checkit2026worstproteinbarsatcostco, title = {10 Worst Protein Bars at Costco in 2026 — Ranked by Ingredient Safety | CheckIt AI}, author = {CheckIt AI}, year = {2026}, publisher = {Climaverse PBC}, url = {https://getcheck.it/worst/protein-bars-at-costco}, note = {Retrieved 2026-03-05} }