PEScience - Select Protein Shake

PEScience Select RTD is the ready-to-drink version of PEScience's flagship Select Protein — the same whey and casein blend that made Select one of the most praised protein powders in the industry, now in a pre-mixed grab-and-go bottle. 25g of protein per bottle. 130 calories. Zero to one gram of sugar. Low carb. Keto friendly. Gluten free. No shaker required. The protein source is Milk Protein Isolate plus Calcium Caseinate — the same dual-source whey and casein approach that delivers the longer satiety window and sustained amino acid release Select powder is known for. Available in Chocolate Truffle and Vanilla Cupcake. Sold at Get Yok'd individually, in 4-packs, and in 12-packs.†

Supplement Facts — PEScience Select RTD (Per Bottle)

• Calories — 130
• Protein — 25g
• Total Carbohydrates — low carb
• Total Sugars — 0-1g
• Total Fat — low
• Protein Sources: Milk Protein Isolate (comprised of Casein Protein and Whey Protein) + Calcium Caseinate
• Other Ingredients: Filtered Water, Milk Protein Isolate, Calcium Caseinate, Natural and Artificial Flavors, High Oleic Sunflower Oil, Cellulose Gel, Cellulose Gum, Sunflower Lecithin, Sea Salt, Potassium Citrate, Gellan Gum, Sodium Phosphate, Sucralose, Acesulfame Potassium
• Contains: Milk
• Gluten free. Keto friendly. Third-party tested for purity and potency.
• Flavors: Chocolate Truffle, Vanilla Cupcake
• Available as singles, 4-packs, and 12-packs at Get Yok'd
• Refrigerate after opening. Consume within 24 hours of opening.

The Protein Behind Select RTD — Why Milk Protein Isolate Matters

Milk Protein Isolate — PEScience's Deliberate Protein Source Choice

Most ready-to-drink protein shakes are built on whey protein concentrate or whey protein isolate alone — it is the cheapest and most widely available protein source in the RTD category, and it is what drives the watery, thin texture and the short-duration amino acid release pattern of most grab-and-go shakes. PEScience builds Select RTD on Milk Protein Isolate (MPI) as its primary ingredient, supplemented with Calcium Caseinate for additional slow-release protein.†

MPI is fundamentally different from whey concentrate or isolate in one important way: it contains both whey and casein in their natural ratio from milk — approximately 80% casein and 20% whey. This is not a blend of separately manufactured whey and casein powders recombined after the fact; it is milk protein in its natural composition, processed to isolate (90%+ protein by weight) with the fat and lactose removed. The result is a protein source that is extremely low in lactose (approximately 0.5g per serving of Select powder — the RTD contains similar trace amounts), rich in casein's bioactive peptides, and simultaneously provides the fast-acting whey fraction for immediate muscle protein synthesis stimulation.†

The Whey and Casein Combination — Why It Works Better Than Either Alone

Whey and casein differ in their digestion kinetics in a way that is practically meaningful for muscle protein synthesis (MPS) and satiety. Whey protein is soluble at stomach pH and passes through the stomach rapidly — it produces a fast, high peak in blood amino acid concentrations within 60-90 minutes of ingestion, which strongly stimulates MPS acutely. Casein is insoluble at stomach pH and forms a gel in the acidic stomach environment that slows its own digestion — it produces a lower, slower, and more sustained rise in blood amino acids over 5-7 hours following ingestion.†

Research comparing whey-only, casein-only, and whey-plus-casein supplementation consistently shows that the combination produces a more favorable overall MPS pattern than either alone: the whey provides the acute post-workout MPS spike, while the casein provides sustained amino acid availability that extends the anabolic window and reduces muscle protein breakdown between meals. A clinical study directly comparing the two found that the whey-plus-casein combination produced significantly greater combined MPS and net muscle anabolism than either protein source in isolation. PEScience's own Select Protein powder has built its 10-year reputation on this approach — Select RTD delivers the same dual-source formula in a ready-to-drink format that requires no preparation.†

130 Calories — Exceptional Protein Density for an RTD

The RTD protein shake market spans an enormous caloric range — from thin, low-protein hydration-focused drinks at under 100 calories to full meal replacement shakes at 300-400 calories. At 130 calories and 25g of protein, Select RTD achieves a protein-to-calorie ratio that puts it among the most efficient RTDs on the market. 25g of protein accounts for 100 of the 130 calories, leaving only 30 calories from fat and carbohydrate combined. For athletes and fitness-focused users who are tracking macros carefully and want a portable protein source that adds meaningful protein without meaningful caloric burden, this ratio is specifically what makes Select RTD worth carrying.†

The Flavor Reality — PEScience's Core Identity

PEScience's entire brand identity is built around flavor — they were one of the first supplement companies to invest seriously in in-house flavor development that produces protein shakes tasting like the desserts they are named after rather than chalky approximations of them. Chocolate Truffle in the RTD tastes like a chocolate truffle — rich, not bitter, not watery. Vanilla Cupcake tastes like vanilla cake batter with frosting notes — not generic vanilla protein extract. This is the same flavor philosophy that produced the cult-favorite Select Protein powder in flavors like Cake Pop, Snickerdoodle, and Peanut Butter Cookie. The RTD format uses High Oleic Sunflower Oil and Cellulose Gel as texture and mouthfeel enhancers to achieve the thick, creamy consistency that makes Select RTD drink more like a premixed protein shake than a watery RTD.†

When and How to Use Select RTD

Select RTD fits any context where you need protein and do not have access to a shaker, powder, or blender. The most common use cases are post-training when you leave the gym and want protein immediately without preparation — grab a Select RTD from Get Yok'd on the way in, drink it on the way out. Between meals as a high-protein, low-calorie snack that satisfies rather than spikes and crashes. On travel, at work, or during any period where meal preparation is not realistic and you still need to hit daily protein targets. The casein fraction specifically makes Select RTD appropriate as a between-meal protein source — its slow digestion provides a sustained satiety window that a whey-only shake cannot match, making it functional as a hunger bridge between meals rather than just an immediate post-workout tool.†

The 12-pack is the cost-effective daily-habit option — enough for two weeks of daily use at one per day, with the per-bottle cost meaningfully lower than singles. The 4-pack is the trial and variety option. Singles are available for customers who want to try a flavor before committing to a case, or who want a single shake for a specific purpose rather than stocking the fridge.†

Frequently Asked Questions About PEScience Select RTD

1. Does the RTD taste the same as Select Protein powder?
   The RTD uses the same flavor philosophy — Chocolate Truffle and Vanilla Cupcake are both present in the powder lineup and deliver the same dessert-accurate profiles in the RTD. The texture is different by nature of the format: the RTD is pre-hydrated and uses emulsifiers (Cellulose Gel, Cellulose Gum, Sunflower Lecithin) to achieve a creamy, pourable consistency, while the powder mixed with water or milk produces a thicker shake depending on liquid ratio. Both are smooth and dessert-forward — the RTD format is slightly thinner but more convenient, and the flavor accuracy is maintained.†
2. Is Select RTD appropriate for lactose-intolerant users?
   Select RTD is extremely low in lactose — Milk Protein Isolate is processed to remove the vast majority of lactose, leaving trace amounts (approximately 0.5g or less per serving in comparable PEScience Select products). For individuals with mild lactose sensitivity who can tolerate very small amounts of lactose, Select RTD is typically well-tolerated. For individuals with diagnosed lactose intolerance who react to any amount of lactose, caution is warranted as this is a dairy-based product. Individuals with a true dairy (milk) allergy should not use Select RTD.†
3. Can I use Select RTD as a meal replacement?
   At 130 calories and 25g of protein, Select RTD can serve as a high-protein, low-calorie meal component or supplemental snack, but it is not a complete meal replacement by nutritional definition — it does not contain the full spectrum of vitamins, minerals, fiber, and micronutrients a complete meal provides. It is best used as a convenient protein source that supports daily protein targets rather than as a replacement for whole food meals. It is suitable for use in calorie-controlled contexts where a high-protein, low-calorie portable option is needed.†
4. Why does Select RTD need to be refrigerated after opening?
   Select RTD is a shelf-stable sealed product prior to opening — it does not require refrigeration before opening due to the packaging process. Once opened, the protein-rich liquid environment is susceptible to rapid bacterial growth at room temperature. PEScience recommends refrigerating after opening and consuming within 24 hours. Unopened bottles are best stored in a cool, dry location out of direct sunlight. Many customers refrigerate their stock for a cold, ready-to-drink experience — this does not affect the protein content or flavor.†

Why Buy at Get Yok'd

• Real-time inventory across all five Southern California stores
• Available in Burbank, Glendale, Glendale Galleria, Pasadena, and North Hollywood
• Sold as singles, 4-packs, and 12-packs — buy what you need
• Authorized retailer of PEScience
• One of the best loyalty programs in the supplement industry — earn rewards on every purchase
• Owned and operated by fitness enthusiasts who actually use what we sell

Who Should Not Use PEScience Select RTD

• Not for individuals with a dairy (milk) allergy — contains Milk Protein Isolate and Calcium Caseinate derived from milk
• Use with caution if you have diagnosed lactose intolerance — extremely low in lactose but not completely lactose-free
• Not intended for use as a sole nutritional source or complete meal replacement
• Consult a physician before use if you have kidney disease or impaired renal function — high protein intake requires physician clearance for individuals with compromised kidney function
• Refrigerate after opening and consume within 24 hours of opening
• Keep out of reach of children

†These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.