Sustain Plant Protein Blend by Muscle Flex Nutrition is a high-quality, plant-based protein powder designed to fuel your recovery and boost muscle growth. With a powerful combination of Soy Protein Isolate and Pea Protein Isolate, Sustain delivers 22.5g of protein per serving, supporting your fitness goals naturally. Low in fat and sugar, this protein blend is perfect for athletes, gym-goers, and anyone seeking a nutritious, dairy-free option. Enjoy easy mixing, delicious flavor, and clean, sustained energy. Fuel your body with Sustain – the plant-powered protein solution.

All Muscle Flex Nutrition products are proudly made in the UK, ensuring the highest quality standards in manufacturing, safety, and ingredient sourcing.

We use only the finest, scientifically-backed ingredients, carefully selected for their effectiveness. Our products are crafted with precision to deliver top-tier performance for athletes and fitness enthusiasts.

We source our ingredients from trusted suppliers and rigorously test them for purity, potency, and safety. Our commitment to small-batch production guarantees consistent, top-quality products.

Orders are processed quickly and shipped directly from our UK facility. You can expect to receive your order within 1-3 working days for UK deliveries.

Absolutely. Whether you're a beginner or an advanced athlete, our range of premium supplements is designed to support your goals, from muscle building and recovery to hydration and overall performance.

We maintain quality by producing our supplements in small batches. This approach ensures that every product is freshly made, carefully monitored, and meets our strict quality standards.