VWG is just the protein extracted from flour! It is made from the protein found in the endosperm of the wheat berry, containing 75% to 80% protein, and although it is like your average flour, it actually contains very little carbs, making each serving very high in protein and very low in carbs!
If you are celiac or have a gluten sensitivity/allergy, you cannot eat vital wheat gluten. As its name suggests, it’s 100% gluten, which should ring some warning bells. To put it plainly: if you’re intolerant to gluten, vital wheat gluten is just about the single worst thing you could consume.