Kirkland Signature

Founded 1995 · Issaquah, Washington, United States · 56 products · costco.com/kirkland-signature.html

80
Brand Score

Certifications

4 certifications
Usp Verified Verified Source
Informed Choice Verified
USDA Organic Verified
Gluten-Free Certified Verified

Violation History

3 incidents
Lawsuit Falsely advertising rotisserie chicken as containing 'no preservatives'2026Source
Recall Kirkland Signature B100 Complex Timed Release2025-03-31Source
Recall Kirkland Signature Severe Cold and Flu Plus Congestion2024-11-30Source
Products by Kirkland Signature
Coenzyme Q10 100 mg
Coenzyme Q10 100 mg
Product 100 Brand 80
Vitamin D3 1000 IU
Vitamin D3 1000 IU
Product 100 Brand 80
Magnesium Citrate 250 mg
Magnesium Citrate 250 mg
Product 100 Brand 80
Vitamin D3 1000 iu
Vitamin D3 1000 iu
Product 100 Brand 80
Vitamin D3 1000 IU Tablets, (2 X 360)
Vitamin D3 1000 IU Tablets, (2 X 360)
Product 100 Brand 80
CoQ10 300mg 100 Softgels
CoQ10 300mg 100 Softgels
Product 100 Brand 80
E 180 mg (400 IU)
E 180 mg (400 IU)
Product 100 Brand 80
CoQ10 300 mg
CoQ10 300 mg
Product 100 Brand 80
D3 50 mcg (2000 IU)
D3 50 mcg (2000 IU)
Product 100 Brand 80
Glucosamine & Chondroitin Tablets
Glucosamine & Chondroitin Tablets
Product 93 Brand 80
KirSublingual B-12 5000 MCG
KirSublingual B-12 5000 MCG
Product 93 Brand 80
B12 5000 mcg Cherry Flavor
B12 5000 mcg Cherry Flavor
Product 93 Brand 80
Super B-Complex with Electrolytes
Super B-Complex with Electrolytes
Product 92 Brand 80
Super B-Complex with Electrolytes
Super B-Complex with Electrolytes
Product 92 Brand 80
Super B-Complex With Electrolytes
Super B-Complex With Electrolytes
Product 92 Brand 80
Calcium Citrate Magnesium and Zinc
Calcium Citrate Magnesium and Zinc
Product 84 Brand 80
Organic Multivitamin
Organic Multivitamin
Product 83 Brand 80
Daily Multivitamin
Daily Multivitamin
Product 82 Brand 80
Whey Protein (Creamy Chocolate
Whey Protein (Creamy Chocolate
Product 78 Brand 80
Organic Multivitamin
Organic Multivitamin
Product 74 Brand 80
Calcium Citrate Magnesium and Zinc
Calcium Citrate Magnesium and Zinc
Product 71 Brand 80
Whey Protein Creamy Chocolate
Whey Protein Creamy Chocolate
Product 66 Brand 80
Vitamin D3
Vitamin D3
Product 66 Brand 80
Frequently Asked Questions
Is Kirkland Signature a trustworthy supplement brand?

Kirkland Signature receives a brand trust score of 80/100 in GoodSupp's independent analysis. The company was founded in 1995 and is headquartered in Issaquah, Washington, United States. They hold 4 verified certifications including Usp Verified, Informed Choice, USDA Organic, Gluten-Free Certified. These certifications are independently verified by GoodSupp and indicate the brand meets recognized quality, purity, and manufacturing standards. Note: Kirkland Signature has 3 historical regulatory incidents on record. These are factored into the overall trust score and are detailed in the violation history section above.

Is Kirkland Signature third-party tested?

Yes. Kirkland Signature holds 4 verified third-party certifications: Usp Verified, Informed Choice, USDA Organic, Gluten-Free Certified. Third-party testing means an independent laboratory — not the supplement company itself — has verified the product's contents, purity, and/or manufacturing practices. This is one of the strongest indicators of supplement quality because it removes the conflict of interest inherent in self-testing. Not all certifications are equal: NSF International and USP are considered the gold standard, while GMP certification indicates proper manufacturing practices.

What are the best Kirkland Signature supplements?

Based on GoodSupp's quality analysis, the highest-rated Kirkland Signature supplements are: Coenzyme Q10 100 mg (score: 100/100); Vitamin D3 1000 IU (score: 100/100); Magnesium Citrate 250 mg (score: 100/100). These scores are calculated from ingredient quality, dosage adequacy, bioavailability, label transparency, and inactive ingredient safety. Scores can vary significantly across a brand's product line — a high brand trust score doesn't guarantee every individual product is top-quality.

Where is Kirkland Signature located?

Kirkland Signature is headquartered in Issaquah, Washington, United States. The company was founded in 1995. They currently offer 56 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.