Question: Is seitan gluten-free?
This process leaves behind a rubbery, meat-like substance that's easily seasoned and then substituted for meat in a variety of vegetarian and vegan dishes.
Since the protein left behind in seitan once that starch is washed away is mainly gluten, seitan is most definitely not gluten-free.
In fact, seitan happens to be one of the most potentially toxic substances available for someone following the gluten-free diet — it's probably second only to vital wheat gluten, which is 100% gluten protein.
Seitan is a popular source of protein for people following a vegetarian or vegan diet, and it commonly appears on the menu in vegetarian restaurants or in ready-to-eat dishes sold at the deli counter and refrigerated sections in health food stores. Watch out for it in wraps, stir-fry dishes or prepared as a barbecued meat substitute — since it contains wheat, it should be clearly labeled, but there may be instances when it isn't.
Since you obviously can't include seitan on your gluten-free vegetarian or vegan diet, you'll want to look for alternative sources of protein. Here are some choices: