Kirkland Signature
Certifications
6 certifications
Is Kirkland Signature a trustworthy supplement brand?
Kirkland Signature receives a brand trust score of 0/100 in GoodSupp's independent analysis. The company was founded in 1995 and is headquartered in Issaquah, Washington, United States. They hold 6 verified certifications including Consumerlab, Non Gmo Project, Usda Organic, Usp Verified, Gluten Free Gfco. 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 6 verified third-party certifications: Consumerlab, Non Gmo Project, Usda Organic, Usp Verified, Gluten Free Gfco. 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: Vitamin D3 1000 iu (score: 100/100); KirSublingual B-12 5000 MCG, 300 Tablets (score: 93/100); B12 5000 mcg Cherry Flavor (score: 93/100). 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 26 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.
Scan Any Supplement Instantly
Download GoodSupp to scan barcodes and check any Kirkland Signature product.