RTD Protein Drinks Disrupt Milk, Shakes, Smoothies, Tea, and Kids’ Beverages

What is driving growth in RTD protein beverages?

Consumers want great-tasting beverages and do not want to compromise. This includes convenient RTD beverages, which feature high protein formulas with clean labels and functional ingredients. As brands diversify into milk, plant-based beverages, smoothies, teas, and children’s products, solving protein flavor, texture, and masking challenges is becoming a major differentiator.

Consumers Crave Protein

Consumers cannot seem to get enough protein. From functional beverages to candy, food and beverage brands are adding protein to just about everything. Ready-to-drink (RTD) protein drinks, derived from both animal and plant-based sources, are driving growth in the beverage market. For instance, dairy products that carry protein claims now represent a $10.4 billion segment within the $104 billion US dairy market, according to Circana. Protein is rapidly expanding in ultra-filtered milk, shakes, smoothies, tea, and kid-focused beverages. Consumers want the benefits of protein, but do not want the negative taste and textures often associated with such products.

Flavor Dynamics, a New Jersey flavor supplier, specializes in solving the taste, texture, and masking challenges that make protein beverages hard to formulate. Using the proprietary Dynamic Flavor Profile Method®, Flavor Dynamics creates custom flavor systems tailored to each protein base, delivering sensory appeal in both dairy and plant proteins.

Protein Flavor Challenges By Category

Protein Beverage Boom

According to SPINS, RTD protein sales rose at a 13% CAGR over the past two years, increasing from $6 billion in 2023 to $7.6 billion in 2025. High protein RTDs are growing in popularity among consumers, with 40% of US households now buying some form of RTD drinks. Furthermore, within RTD, clear protein RTD shakes drove the highest sales growth in 2025 (up 34%), followed closely by dairy-based drinks such as ultra-filtered protein shakes (up 25%), and protein waters, shots, and sodas (up 12%). Likewise, at the Expo West 2026, NIQ observes that protein continues its upward trajectory. “Ingredient suppliers reinforced the trend through new formulations designed to deliver protein without compromising taste or texture, such as high-clarity shakes and hybrid beverages combining protein with digestive support.”

Keurig DrPepper’s State of Beverage 2026 Trend Report found that Gen A/Z (ages 13–29) are more likely than Millennials+ (ages 30+) to drink functional and performance-driven beverages across every major category. For example:

• 50% are more likely to consume protein beverages weekly
• 75% are more likely to consume sports drinks weekly

Furthermore, Gen A/Z aren’t choosing between health or enjoyment. They expect both, often in the same product. “That’s why they over-index on beverages that deliver both functional benefits and flavor-forward, indulgent experiences.” 71% of Gen A/Z look for function-forward beverages vs. 66% of Millennials+. Protein has become a core beverage expectation, and brands are accelerating toward hybrid formats that blend functional performance with flavor-forward enjoyment.

Milking It With Protein

Milk is a nutritious beverage enriched with calcium, vitamin D, and protein. Consumers’ growing interest in protein has sparked a renewed interest in milk. This momentum is creating new opportunities for flavor innovation. “Globally, 60% of consumers say they are actively trying to increase their protein intake, while high protein claims continue to rise across dairy launches,” according to HealthFocus. Innova’s research shows that half of global consumers have increased their dairy beverage intake due to the perception of healthiness. Key health claims for dairy beverages include high protein, low fat, no added preservatives, and bone health. High protein milk recorded 7.7% value growth and 1.2% volume growth, per Circana. “Consumer research shows growing demand for protein, easier digestion and lactose-free options, with gut health emerging as a key area of interest,” notes Jon Cowell, chief executive officer of Maola. Brands are launching ultra-filtered milk and protein-enriched formulas.

For example, Maola Milk introduced Strawberry Whole Milk, free of artificial dyes, with 8 g of protein and 13 essential nutrients. Additionally, the brand released More Milk, a line of lactose-free milk, featuring 15 g of protein and prebiotic fiber. It is available in Whole Ultra-Filtered White Milk and 2% Reduced Fat Chocolate Milk. Similarly, Target introduced Good & Gather Ultra-Filtered Milk in four varieties: Whole Milk, 2% Reduced Fat, Fat-Free, and Chocolate. Kemps debuted Protein+ Milk. It is lactose-free, ultra-filtered milk that delivers 13 g of protein per serving with 50% less sugar. It is available in Whole White Milk, 2% Reduced Fat White Milk, and 2% Reduced Fat Chocolate Milk. Furthermore, it is shelf-stable and can last for up to 120 days. Organic Valley launched Protein Plus, made with pasture-raised, ultra-filtered organic milk. The line is 100% lactose-free, USDA organic, and comes in Whole, 2% Reduced Fat, and Fat-Free varieties. Ultra-filtered milk addresses consumers’ demand for higher protein, lower sugar, and lactose-free dairy options.

Muscle Up

Now that milk is trending, brands are capitalizing on RTD protein beverages designed to help consumers build and maintain muscle mass more effectively. For example, PepsiCo reformulated Muscle Milk that delivers 26 g to 42 g of protein through ultra-filtered milk. The new formula reduced its ingredient lists by removing artificial sweeteners, artificial flavors, and added colors. Lifeway’s Muscle Mates is a lactose-free, RTD functional beverage that combines 20 g of protein, 5 g of creatine, and 12 live and active probiotic cultures.

Milk is moving into a new era where lactose-free, RTD high protein dairy innovations are reshaping the category. These high protein, muscle-focused milks are expanding beyond the gym into the mainstream. As GLP-1 usage accelerates and consumers become more aware of the risk of muscle mass loss, these formulas are well-positioned to support everyday nutrition and muscle maintenance.

RTD Plant-Based Milk Leans Into Protein

The dairy alternative beverage market has slowed. According to Circana, US dollar sales for the overall plant-based milk category totaled $2.3 billion, down 2.1%, for the 52 weeks ending April 19, 2026. However, alt-dairy brands are responding to consumers’ growing demand for functional beverage options. RTD plant-based milks are leaning into protein.

For instance, Silk introduced Silk Protein, a high protein, plant-based beverage with 13 g of complete plant protein. In addition to protein, the beverage includes 3 g of fiber, calcium, and vitamin D. It is available in two flavors: Original and Chocolate. Likewise, Organic Protein Milk joins Ripple Foods’ portfolio. The beverage features 5 g of pea protein per serving, and comes in Original and Vanilla flavors. Elmhurst 1925 introduced Clean Protein, an RTD plant-based protein beverage featuring 27 g of plant protein from mung beans and peas. The Pistachio Crème highlights Elmhurst’s pistachio milk with vanilla extract. Sea Salt Chocolate (real cocoa and salt), Strawberries and Cream (strawberry puree), and Vanilla (vanilla extract) variants use cashew milk as the base. The drinks provide up to 44% of the daily recommended protein, along with iron, fiber, calcium, and potassium.

Blue Diamond Growers added Blue Diamond Almondmilk in four varieties: Unsweetened Simple, Sweetened Simple, Signature Creamy, and Chocolate Protein. The Chocolate Protein is made with 8 g of plant protein. Califia’s new Simple & Organic Soymilk contains organic soybeans, water, sea salt, and 8 g of plant protein. The brand also expanded its RTD coffee blends with Almondmilk, featuring Brown Sugar Cold Brew, Vanilla Cold Brew, and Unsweetened Matcha.

RTD plant-based milks are following suit by boosting protein levels and paving the way for more advanced, nutrition-focused innovation across the category.

Protein Shakes It Up

The global high protein RTD shakes market is projected to grow from $4.6 billion in 2026 to $9.2 billion by 2033, at a CAGR of 10.2%, according to Grand View Research. To address the use of GLP-1 medications and nutritional gaps, brands are introducing high protein dairy shakes. Chocolate, Vanilla, and Strawberry are popular flavors. Protein shakes contain between 23 g and 45 g of protein, often with added vitamins and prebiotic fiber. For example, Quest added Salted Caramel Protein Milkshakes to its portfolio, packed with 45 g of protein. Similarly, Premier Protein released Protein Ultimate featuring 42 g of protein, 24 vitamins and minerals, and no added sugar. Ultimate comes in Café Latte (with caffeine equivalent of one cup of coffee), Chocolate, Vanilla, and Strawberry. Optimum Nutrition introduced 40G Protein Shake in Chocolate and Vanilla flavors.

Boost offers Advanced Nutritional Shakes in Rich Chocolate and Very Vanilla varieties. It contains 35 g of protein, 4 g of prebiotic fiber, and eight essential B vitamins. Mocha Latte and Strawberry join the OIKOS Protein Shake lineup. The Protein Shakes deliver 30 g of complete protein, 5 g of prebiotic fiber. and Vitamins A and D. The Mocha flavor combines chocolate and coffee, plus 95 mg of caffeine. Orgain offers an A2 30 g RTD Creamy Chocolate Protein Shake at Costco. The ultra-filtered milk formula features 3 g of leucine and nine amino acids. Quaker Oat Shake & Go is a whole grain oat shake in two flavors: Cinnamon Vanilla and Strawberry & Banana. It delivers 23 g of protein when prepared with 8 oz of milk, 16 g of whole grains, and 3 g of fiber per serving.

Protein shakes continue to evolve with higher protein levels and added functional benefits, reinforcing their role as a leading application in the RTD protein space.

Plant-Based Protein Shakes Enter The Conversation

In addition to RTD high protein dairy-based shakes, brands are responding with dairy-free protein shakes. Plant-based protein shakes are gaining traction as consumers seek high protein options that fit dairy-free, vegan, and flexitarian lifestyles. For example, Kate Farms launched a plant-based High Protein Nutrition Shake in Chocolate and Strawberry SKUs. The dairy-free RTD protein shakes feature 25 g of organic pea protein, 6 g of fiber, essential vitamins and minerals, and zero sugar. Likewise, Danone’s Silk brand debuted a shelf-stable RTD Protein Shake designed for convenient, on-the-go consumption in Chocolate and Vanilla flavors. Juice Plus+ introduced the Complete Strawberry Nutrition Shake. The protein shake mix offers 14 g of plant-based protein, 8 g of dietary fiber, 1 g of sugar, and essential vitamins and minerals. The protein source blends soy, chickpea, rice, and pea proteins with Ancient grains and sprouts, including quinoa, amaranth, alfalfa, and broccoli sprouts.

Dairy-free protein shakes are meeting the demand for high protein, plant-based options.

Smooth Operator

In addition to protein shakes, brands are formulating RTD Protein Smoothies. RTD protein smoothies bridge the gap between traditional protein shakes and fruit-forward functional beverages, making protein feel more approachable. For example, LALA® expanded its range with LALA Plus™, a drinkable yogurt smoothie. The RTD lactose-free Smoothies are available in Mango, Piña Colada, Strawberry, and Strawberry Banana flavors. The drinks deliver 11 g of protein and 4 g of fiber plus calcium. GoodBelly introduced Protein + Probiotics Smoothies, a dairy-free alternative to kefir in Blueberry, Peach, and Strawberry flavors. The fruit-forward drinks have 11 g of protein and 1 billion CFUs of probiotics per 8-ounce serving. Chocolate Banana Protein and Blueberry Cheesecake Protein join Naked Smoothies’ range. Each smoothie is packed with 20 g of plant-based protein, 6 g of fiber, and vitamins B6 and B12.

RTD protein smoothies are reshaping expectations by combining functional protein with bold, flavor-forward experiences that feel both nutritious and indulgent.

Latest Entrant Tea + Protein

Coffee fortified with protein has been trending. Now, protein tea is the latest entrant. This shift reflects protein’s evolution from sports nutrition into a mainstream functional beverage ingredient. Protean Tea, an early pioneer in the RTD Protein Tea space, relaunched in 2026. The original flavors include Groovy Lemon and Perfectly Peach. The newest flavors are Ananas Delight (pineapple mango) and Razzle Dazzle (raspberry). The RTD Protein Drinks feature brewed tea, 15 g of protein from ioWHEY® Protein Isolate, 3 g of prebiotic fiber, and collagen peptides. Tazo is launching two Protein Lattes: Chai Latte and Matcha Latte, each offering 20 g of protein per serving. Laird Superfood adds an Instant Protein Matcha collection to its portfolio. The flavors include Lavender, Original, and Strawberry, each of which contains 10 g of milk-based protein. Original and Strawberry are formulated with 70 mg of caffeine, while Lavender has 90 mg. The matcha also contains lion’s mane mushroom, coconut water powder, and sea salt.

Protein-fortified tea is emerging as a flavorful, RTD protein option that blends health and wellness with functional benefits.

Kids’ Corner

Protein is not just for adults. Parents are seeking ways to increase protein intake for both themselves and their kids, prompting brands to develop kid-focused protein powders and beverages. For example, Hiya introduced Kids Daily Growth + Protein in a Sweet Cream flavor. According to the brand, the clean, protein-based powder supports healthy growth and development for children. Nurri launched Nurri Kids, an ultra-filtered protein shake designed specifically for kids, available at Sam’s Club. The RTD Protein Shake is available in Chocolate Milkshake flavor, offering 10 g of protein and 2 g of sugar per serving.

Kid-focused protein beverages are emerging as parents seek convenient ways to support their children’s daily nutrition and growth.

Formulation Challenges Across RTD Protein Applications

While each beverage category has distinct formulation needs, protein formulations face similar technical hurdles, including:

• Bitterness
• Off-notes
• Mouthfeel
• Textural characteristics
• Chalkiness
• Flavor stability
• Sweetness balance
• Lingering aftertaste
• Ingredient interactions
• Processing effects
• Protein denaturation
• Clean label expectations

Protein Powers On

As RTD protein drinks continue to disrupt every corner of the beverage aisle, from milk and plant-based milks to shakes, smoothies, tea, and kid-focused formats, the category is clearly moving toward more functional, high protein, and flavor-driven innovation. With this expansion, formulation challenges become increasingly complex. Flavor Dynamics combines protein flavor science, masking technologies, and sensory evaluation to drive marketplace success.

Brands are racing to deliver high protein, flavorful beverages, and consumers are demanding both performance and enjoyment. Flavor Dynamics is uniquely positioned to help craft custom flavor systems that solve protein’s toughest taste and texture challenges. Contact us today to discuss your goals, timelines, and technical requirements for your next protein beverage project or request a sample.

Frequently Asked Questions About RTD Protein Drinks

To better understand why protein beverages are difficult to flavor, explore The Science of Protein Flavor.