Kirkland Signature Vitamin C. $3 off a bottle of 500, 1000 mg tablets. Known for its ability to support the immune system—which is especially important as we come into cold and flu season—it ...

Kirkland Signature is beloved by Costco’s loyal fan base and is known for its high-quality, low-cost items, including apparel ...

Ramhold said Kirkland Signature adult multivitamins will be on sale for $2.50 off in Costco's latest March ad. The sale will extend to the Kirkland Signature Vitamin D3, Calcium Citrate, Magnesium ...

For example, the Kirkland Signature gummies have 750 mcg of Vitamin A, 30 mg of Vitamin C, and 20 mcg of Vitamin D, while Walmart's brand has 390 mcg, 60 mg, and 10 mcg of the same vitamins. 6 ...