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.