Kirkland Signature Vitamin C

Kirkland Signature Vitamin C is a widely recognized dietary supplement specifically formulated to provide 1000 mg of Vitamin C per tablet, often enhanced with rose hips and citrus bioflavonoids for improved absorption. The brand is the private label of Costco Wholesale Corporation, established to provide high-quality items at competitive prices compared to national brands.

While Costco sources various products globally, their Vitamin C tablets are primarily manufactured in the United States. The brand itself traces its origins back to the mid-1990s in Issaquah, Washington, taking its name from the city where the company's headquarters were formerly located. This product line is famous for its USP (United States Pharmacopeia) verification, ensuring rigorous quality standards.