What is vital wheat gluten? Vital Wheat Gluten powder, also known as active gluten flour, is a natural protein extracted from wheat. Its protein content is more than 80%, and its amino acid composition is relatively complete. It is a nutritious, high-quality and low-cost vegetable protein source. Wheat gluten is mainly composed of glutenin with small molecular weight, spherical shape and good extensibility and glutenin with large molecular weight, fibrous shape and strong elasticity.