The viral world of protein coffee is heading mainstream, and Starbucks is ready to meet the moment by combining nutrition with nostalgia.

Starbucks will soon be introducing a protein cold foam to its menus — and it contains between 15 and 18 grams of protein.

Starbucks announced new Frappuccino drinks that will feature a cold foam topping. One flavor, inspired by customer creations, brings two chain favorites together for the first time. The new menu items ...