Vital Wheat Gluten is a protein processed from natural wheat flour by a process that involves soaking wheat grains in water. Vital wheat gluten is a non-animal protein substitute that is popular among vegetarians in many Asian cuisines.

It is used to add elasticity to flours that are low in gluten, like whole wheat flour. It improves the rise of the raw dough and also improves the texture and chewiness of the final product.
Vital Wheat Gluten