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KIRKLAND

Founded 1995 · Issaquah, Washington, United States · 13 products · costco.com/kirkland-signature.html

100
Brand Score

Certifications

6 certifications
Non Gmo Project Source available Primary evidence
Usda Organic Source available Primary evidence
Usp Verified Source available Primary evidence
Consumerlab Verified evidence Primary evidence
Fda Gmp Inspections Source available Primary evidence
Vegan Certified Source available Primary evidence

Transparency Claims

4 claims
In House Testing — Brand claim; evidence unavailable
Third Party Testing Claim — Evidence available Evidence
Testing Lab Disclosure — Brand claim; evidence unavailable

Violation History

9 incidents
Prop 65 Lead2026-02-01 Source checked Primary source
Prop 65 Lead2026-01-29 Source checked Primary source
Lawsuit Persistent Salmonella contamination in Kirkland Signature rotisserie and raw chicken products.2026 Source available Primary source
Lawsuit False and misleading claims that Kirkland Signature fish oil supplements support heart health.2024 Source available Primary source
Recall Kirkland Signature Aller-Fex2023-02-09 Source checked Primary source
Lawsuit Falsely advertising rotisserie chicken as having 'no preservatives' when it contains sodium phosphate and carrageenan.2023 Source available Primary source
Recall Kirkland Signature Brand Three Berry Blend2019-06-01 Source checked Primary source
Lawsuit Falsely advertising that Kirkland Signature Extra Strength Glucosamine and Chondroitin products provide meaningful joint health benefits.2018 Source available Primary source
Lawsuit Kirkland Signature Wild Alaskan Fish Oil contained less than half of the omega fatty acids claimed on the label.2018 Source available Primary source
KIRKLAND products

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Frequently Asked Questions
Is KIRKLAND a trustworthy supplement brand?

KIRKLAND receives a brand trust score of 100/100 in GoodSupp's independent analysis. The company was founded in 1995 and is headquartered in Issaquah, Washington, United States. They hold 1 verified certifications including Consumerlab. GoodSupp has a checked evidence link for each record. Certification scope varies and does not prove that every product or batch was independently tested for contents, purity, or effectiveness. Note: KIRKLAND has 9 historical regulatory incidents on record. These are factored into the overall trust score and are detailed in the violation history section above.

Is KIRKLAND third-party tested?

GoodSupp found checked evidence links for 1 certification records associated with KIRKLAND: Consumerlab. Their scope varies: a manufacturing certification is not the same as independent testing of every product or batch. Review the linked evidence and the certification scope before treating it as proof of contents or purity.

Where is KIRKLAND located?

KIRKLAND is headquartered in Issaquah, Washington, United States. The company was founded in 1995. They currently offer 13 products in their supplement lineup. Their official website is costco.com/kirkland-signature.html. Manufacturing location may differ from corporate headquarters — look for GMP certification to verify manufacturing quality standards.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.