Starbucks vs. Dunkin': Protein Coffee Showdown

The race to capture the health-conscious coffee drinker's wallet has intensified, as major chains Starbucks and Dunkin' roll out dedicated protein beverage menus. These new offerings aim to satisfy the growing demand for 'proffee'—a trend that blends the morning caffeine fix with muscle-building supplements.

While both chains promise high protein content and great taste, a side-by-side comparison reveals distinct differences in flavor profiles and value. From Starbucks' impressive matcha to Dunkin's dessert-like latte, the results highlight a clear divide between the two giants.

Both chains introduced their protein lines recently, aiming to integrate protein-boosted milk and powders seamlessly into their standard menus. Starbucks launched its initial line in the fall of 2025, expanding in early 2026 with two new caramel beverages. Dunkin' entered the arena with five signature drinks, all utilizing a proprietary protein-rich milk.

The nutritional goals are ambitious. Starbucks offers drinks containing at least 27 grams of protein in a grande size, with some reaching 36 grams. Dunkin' drinks generally contain 15 grams of protein per serving. The core question for consumers is whether these drinks taste like a premium coffee or a chalky supplement.

Key Menu Additions:

• Starbucks: Iced Protein Matcha & Iced Caramel Protein Latte
• Dunkin': Iced Almond Matcha & Iced Caramel-Chocolate Latte
• Availability: Both chains allow adding protein milk to standard drinks

Starbucks' entry into the market proved to be a study in contrasts. The Iced Protein Matcha was a standout success. Priced at $6.45, this drink delivered 36 grams of protein without compromising on quality. The reviewer noted that it tasted exactly like a standard iced matcha, completely masking the protein powder.

Conversely, the Iced Caramel Protein Latte fell short. Despite costing $6.95 and containing 27 grams of protein, the drink was marred by a saccharine, artificial-tasting aftertaste. The experience was compared to drinking a grocery store grab-and-go protein shake rather than a barista-crafted latte.

After just one sip, I immediately—and unfortunately—knew this would not be a repeat order.

The ingredient list for the latte included milk, espresso, caramel syrup, and protein powder. While the caramel notes were present, the lingering artificial flavor overshadowed the experience, leaving the matcha as the clear winner in the Starbucks lineup.

Dunkin' approached the protein trend with a different flavor strategy. The Iced Almond Matcha Protein Latte, priced at $7.99, did not impress. The combination of matcha blend, cane sugar, and toasted almond flavor created a sharp, tangy note that distracted from the traditional earthy matcha taste.

However, the Iced Caramel-Chocolate Protein Latte emerged as the champion of the taste test. Costing $7.59 and containing 15 grams of protein, this drink offered a rich, dessert-like experience. Unlike the Starbucks caramel latte, Dunkin's version—enhanced with brown sugar and molasses—lacked any artificial aftertaste.

After my first sip, my eyes grew wide. This one... tasted like a dessert in a cup.

Despite the lower protein count compared to Starbucks, the superior flavor profile of the Dunkin' caramel-chocolate latte made it the most desirable option for a treat.

When weighing the options, the choice comes down to nutritional density versus flavor satisfaction. Starbucks wins on protein quantity and the specific matcha category, while Dunkin' takes the prize for the best-tasting latte.

However, the price point for both chains is significant. With drinks ranging from $6.45 to $7.99, the cost adds up quickly. The reviewer ultimately concluded that while the Dunkin' latte is a worthy post-workout splurge, the most practical solution remains making 'proffee' at home using standard milk, protein powder, and espresso.

Final Rankings:

1. Best Matcha: Starbucks Iced Protein Matcha
2. Best Latte: Dunkin' Iced Caramel-Chocolate Protein Latte
3. Best Value: Homemade Proffee