See all results for matrix protein. 1  Matrix Whey Protein Concentrate Nutrition Powder Shake - Optimum Lean Muscle all in one drink (Strawberry, 5KG) by Matrix Nutrition. 2  Matrix Nutrition Anabolic Gold Protein Powder Shake - Whey Protein Concentrate Blend - Build Muscle (Strawberry, 2.25KG) by Matrix Nutrition.