--- product_id: 429215613 title: "Syntrax Matrix Sustained‑Release Protein Powder Blend, Milk Chocolate 5 lb | Whey Protein, Micellar Casein, Egg Albumin" brand: "syntrax" price: "¥36536" currency: JPY in_stock: true reviews_count: 8 url: https://www.desertcart.jp/products/429215613-syntrax-matrix-sustained-release-protein-powder-blend-milk-chocolate-5 store_origin: JP region: Japan --- # Sustained-release protein for steady recovery Micellar Casein & Egg White for complete amino profile rBST-Free, Grass-Fed Whey for clean nutrition Syntrax Matrix Sustained‑Release Protein Powder Blend, Milk Chocolate 5 lb | Whey Protein, Micellar Casein, Egg Albumin **Brand:** syntrax **Price:** ¥36536 **Availability:** ✅ In Stock ## Summary > 💪 Fuel your grind with the smoothest, cleanest sustained-release protein blend! ## Quick Answers - **What is this?** Syntrax Matrix Sustained‑Release Protein Powder Blend, Milk Chocolate 5 lb | Whey Protein, Micellar Casein, Egg Albumin by syntrax - **How much does it cost?** ¥36536 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/429215613-syntrax-matrix-sustained-release-protein-powder-blend-milk-chocolate-5) ## Best For - syntrax enthusiasts ## Why This Product - Trusted syntrax brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Pure & Premium 🥛:** Sourced from rBST-free, grass-fed whey ensuring clean, hormone-free protein that aligns with your health-conscious lifestyle. - • **Steady Muscle Fuel ⏳:** Time-released protein blend delivers amino acids gradually to maximize muscle recovery and growth all day long. - • **Complete Amino Support 🥚:** Combines micellar casein and egg white protein for a comprehensive amino acid profile that supports sustained muscle repair. - • **Mixes Instantly & Smoothly 🥄:** Ultra-instantized formula dissolves effortlessly with just a spoon—no clumps, no hassle, just smooth deliciousness. - • **Irresistible Milk Chocolate Flavor 🍫:** Enjoy a rich, crave-worthy taste that turns your protein shake into a daily treat, making consistency effortless. ## Overview Syntrax Nutrition Matrix is a 5 lb sustained-release protein blend featuring rBST-free, grass-fed whey, micellar casein, and egg white protein. Designed for steady amino acid delivery, it supports muscle recovery and growth with 23g of premium protein per serving. This ultra-instantized milk chocolate formula mixes smoothly with just a spoon, offering 73 servings of clean, hormone-free nutrition perfect for pre-, during, or post-workout fueling. ## Description Matrix is a sustained release protein blend that derives from ultrafiltered whey protein, ultrafiltered micellar casein, native egg white protein and glutamine peptides. Matrix is thoroughly instantized so that every scoop dissolves perfectly in your favorite beverage using only a spoon for vigorous stirring. Matrix is available in 11 amazing flavors! ## Features - Multi-Source Protein Complex: Features Undenatured Micellar Casein and Egg White Protein for comprehensive muscle recovery and growth - Sustained-Release Protein Blend: Advanced formula delivers a continuous stream of amino acids throughout the day for optimal muscle support - Premium Quality Ingredients: Contains rBST-Free, Grass-Fed Whey for superior protein nutrition and quality assurance - Low Carb Nutrition: Zero sugar and low carbohydrate content supports lean muscle development and fitness goals - Complete Protein Matrix: Combines ultrafiltered whey protein, micellar casein, native egg white protein, and glutamine peptides for comprehensive amino acid profile ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B09Y2C33YM | | Best Sellers Rank | #183 in Sports Nutrition Whey Protein Powders | | Date First Available | April 15, 2022 | | Item Model Number | SM5MC | | Manufacturer | Si03, Inc. | | Product Dimensions | 9 x 6 x 14 inches; 5 pounds | ## Product Details - **Brand:** Syntrax - **Flavor:** Milk Chocolate - **Item Weight:** 5 Pounds - **Material Type Free:** rBST-Free - **Servings per Container:** 73 ## Images ![Syntrax Matrix Sustained‑Release Protein Powder Blend, Milk Chocolate 5 lb | Whey Protein, Micellar Casein, Egg Albumin - Image 1](https://m.media-amazon.com/images/I/71oyjYON0WL.jpg) ![Syntrax Matrix Sustained‑Release Protein Powder Blend, Milk Chocolate 5 lb | Whey Protein, Micellar Casein, Egg Albumin - Image 2](https://m.media-amazon.com/images/I/71sq8gX2UeL.jpg) ![Syntrax Matrix Sustained‑Release Protein Powder Blend, Milk Chocolate 5 lb | Whey Protein, Micellar Casein, Egg Albumin - Image 3](https://m.media-amazon.com/images/I/818yA9tIHlL.jpg) ![Syntrax Matrix Sustained‑Release Protein Powder Blend, Milk Chocolate 5 lb | Whey Protein, Micellar Casein, Egg Albumin - Image 4](https://m.media-amazon.com/images/I/71BbB+4MhpL.jpg) ![Syntrax Matrix Sustained‑Release Protein Powder Blend, Milk Chocolate 5 lb | Whey Protein, Micellar Casein, Egg Albumin - Image 5](https://m.media-amazon.com/images/I/61Hne2XAwWL.jpg) ## Available Options This product comes in different **Flavor Name, Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ High Quality, Good Taste, Easy Mix *by on Reviewed in the United States June 1, 2026* Top quality ### ⭐⭐⭐⭐⭐ Love the taste! *by on Reviewed in the United States March 2, 2026* Great taste! My go to for many years now. New packaging design. I’m a milk chocolate fan. I put some ice cubes in, water, half a scoop of protein, and half a banana to start my day. I finish it quickly! ### ⭐⭐⭐⭐⭐ Good just mix it up good *by on Reviewed in the United States March 12, 2026* I like the macros and the taste is good not very chemically . You do have to mix pretty aggressively so don’t expect to use a spoon . Texture is fine when mixed properly. ## Frequently Bought Together - Syntrax Nutrition Matrix Protein Powder, Sustained-Release Protein Blend, Milk Chocolate, 5 lbs - Syntrax Matrix Whey Protein, Peanut Butter Cookie, 5 Pound --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/429215613-syntrax-matrix-sustained-release-protein-powder-blend-milk-chocolate-5](https://www.desertcart.jp/products/429215613-syntrax-matrix-sustained-release-protein-powder-blend-milk-chocolate-5) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-14*