<ul data-eligibleForWebStory="true">Starbucks is testing a protein cold foam option to add 15 grams of protein to any beverage.The protein cold foam includes unsweetened protein powder and is available in various flavors.A trial sample included a banana protein cold foam in a sugar-free vanilla latte.Customers can add the protein cold foam to any beverage.Starbucks is following the trend of incorporating protein into beverages after a move by Dutch Bros Coffee.CEO Brian Niccol noted the convenience for customers who currently add protein powder to their drinks themselves.Starbucks plans to test the protein cold foam at five U.S. locations before a potential nationwide rollout.