Kirkland Signature

Kirkland Signature is a natural dietary supplement brand of Costco, the largest retailer in the US, with more than 400 warehouses across the country and more than 170 stores in Canada, Mexico, the UK, Japan, Thailand, Australia, and Korea. Costco only sells to customers with a membership card.Kirkland Signature-branded products are all certified by the American Pharmacopeia Council. Therefore, at Costo, customers can feel secure when purchasing vitamins, minerals, Omega-3 fish oil, glucosamine, probiotics, MSM, and vitamin D3.

Website: https://www.costco.com/

Headquarters: Issaquah, Washington