Our mushroom products do not contain gluten or maltodextrin. Our Mushroom Capsules contain a few additional ingredients:  Hypromellose controls the release of the Mushroom Powder into the body.   Organic brown rice flour acts as a filler, as the dose of our Mushroom Powders do not fill an entire capsule.  Vegetable magnesium stearate keeps the ingredients with the capsule from sticking together.