🏬 Worst Protein Bars at Costco

We ranked the 7 lowest-scoring protein bars products at Costco based on real ingredient analysis. The average score is 53/100.

7
Products Ranked
53
Avg Score
6
Have Additives
6
Have Seed Oils

These products scored the lowest for ingredient safety among protein bars at Costco. Every product has been analyzed for additives, seed oils, allergens, and harmful chemicals.

Worst Protein Bars at Costco — Full Rankings

#ProductBrandScoreFlags
1Soft & Chewy Granola BarsKirkland28/1006 additives, 4 seed oils, 3 allergens
2Nut BarsCostco33/1004 additives, 4 seed oils, 3 allergens
3Chocolate Peanut Butter ChunkKirkland Signature49/1004 additives, 3 seed oils, 2 allergens
4PEANUT BUTTER & SEMISWEET CHOCOLATE CHIP CHEWY PROTEIN BARS, PEANUT BUTTER & SEMISWEET CHOCOLATE CHIPCostco Companies Inc.49/1004 additives, 3 seed oils, 5 allergens
5Chi lately Chunks Cookie Dough Protein BarKirkland Signature49/1004 additives, 3 seed oils, 2 allergens
6CHOCOLATE PEANUT BUTTER CHUNK PROTEIN BAR, CHOCOLATE PEANUT BUTTER CHUNKCostco Companies Inc.74/100Clean label ✓
7Chocolate Brownie Protein BarKirkland90/1001 additive, 2 seed oils

⚠️ Why These Products Score Low

The most common issues include artificial additives, seed oils, and artificial colors. Many of these products contain ingredients that are banned or restricted in the EU but still legal in the US.

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Frequently Asked Questions

What are the worst protein bars at Costco?
Based on ingredient analysis, the lowest-scoring protein bars at Costco include Soft & Chewy Granola Bars (28/100), Nut Bars (33/100), Chocolate Peanut Butter Chunk (49/100).
How many protein bars does Costco carry?
We've analyzed 7 protein bars products at Costco. The average safety score is 53/100.
What should I avoid in protein bars at Costco?
Common concerns in Costco protein bars include artificial additives, seed oils, and artificial colors. Use CheckIt AI to scan any product before buying.

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Same Category, Different Stores

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📋 Cite This Data
APACheckIt AI. (2026). "Worst Protein Bars at Costco — 7 Products Ranked by Ingredient Safety | CheckIt AI". Climaverse PBC. Retrieved from https://getcheck.it/worst-at/costco/protein-bars
MLA"Worst Protein Bars at Costco — 7 Products Ranked by Ingredient Safety | CheckIt AI." CheckIt AI, Climaverse PBC, 2026-03-06. https://getcheck.it/worst-at/costco/protein-bars.
HTML Embed<a href="https://getcheck.it/worst-at/costco/protein-bars">Worst Protein Bars at Costco — 7 Products Ranked by Ingredient Safety | CheckIt AI — CheckIt AI</a>
BibTeX@misc{checkit2026worstatcostcoproteinbars, title = {Worst Protein Bars at Costco — 7 Products Ranked by Ingredient Safety | CheckIt AI}, author = {CheckIt AI}, year = {2026}, publisher = {Climaverse PBC}, url = {https://getcheck.it/worst-at/costco/protein-bars}, note = {Retrieved 2026-03-06} }