Kirk's

Kirk's 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 5 verified certifications including Consumerlab, Usda Organic, Usp Verified, Gluten Free Gfco, Vegan Certified. These certifications are independently verified by GoodSupp and indicate the brand meets recognized quality, purity, and manufacturing standards. Note: Kirk's has 1 historical regulatory incident on record. These are factored into the overall trust score and are detailed in the violation history section above.

Yes. Kirk's holds 5 verified third-party certifications: Consumerlab, Usda Organic, Usp Verified, Gluten Free Gfco, Vegan 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.

Kirk's is headquartered in Issaquah, Washington, United States. The company was founded in 1995. They currently offer 6 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.