The most important sentence about health and wellness at Costco in 2026 did not come from a wellness influencer or a nutrition brand. It came from Costco's own CFO, Gary Millerchip, discussing the company's most commercially significant new product developments: the Kirkland Signature Beef Stick is "doing tremendous volume," while CEO Ron Vachris noted that the Kirkland Signature Ultra Filtered Protein Milk "has just taken off." These are not coincidental product highlights.

Not everything at Costco is a great deal. The bananas have a ripening problem. The mayo container outlasts the product's quality window. The spices lose their potency before most households work through the warehouse-sized container. These realities exist, and the best Costco members know them. But for every category where the bulk format doesn't work, there are dozens of categories where Costco's institutional buying power, Kirkland Signature quality commitment, and 14 perce