Cold foam is one of Starbucks’s most popular add-ons. Now, it can be packed with protein, too. Since Brian Niccol took over as Starbucks CEO last September, he’s been promising to counter slow sales by revitalizing the company’s commitment to being a “third place”—a space where customers sit and stay a while.

Even Starbucks is hopping on the protein trend. If you’ve been on the internet in recent months, you’ve probably seen an increase in interest in protein-heavy food and drinks. Now, Starbucks is testing a new way to instantly add a whopping 15 grams of protein to nearly any beverage.

Starbucks Corp. is testing a protein option in its drink lineup, wading into a red-hot trend as it seeks to reverse a string of sales declines.