Costco 1 article

Membership-warehouse retail is Costco's defining channel, with groceries, supplements, protein products, beverages, and packaged foods often sold in larger or club-specific configurations. Nutrition items may appear in multipacks or sizes that differ from standard grocery or direct-to-consumer versions, which can materially affect unit-cost comparisons. Warehouse inventory also changes by region and season. Costco is therefore especially relevant to pack-size and value analysis, while formulation details should still be checked against the product label or brand source.