Starbucks is betting that an extra shot of protein could be the jolt its turnaround needs. The coffee giant on Monday launched a new line-up of protein lattes and cold foam drinks in the U.S. and Canada. They will be available on the menu year-round. Shares of Starbucks rose more than 2% — chipping away at year-to-date declines that are now under 7%. The stock has, however, underperformed the S & P 500, which has gained 13% in 2025. Wells Fargo sees these new protein beverages as a "next potential catalyst" for the company's U.S. sales, the analyst wrote in a research note to clients Monday. They estimate the launch could add roughly 250 basis points, or 2.5 percentage points, to U.S. same-store sales. That translates into about $720 million in sales if "attach rates" – how often customers add protein in their regular order – hit 10%. "Protein is on trend and could broaden Starbucks' customer base," the analysts wrote.