Gluten-free Non-GMO 100% Vegan Dietary Supplement Cordyceps Militaris 500 mg Per Capsule Mushroom Lab Verified Discussion: Solaray ally Grown Mushrooms are 100% vegan, excipient-free and contain no fillers or additional ingredients. The mushroom mycelium biomass is cultured on gluten-free whole oats and then fermented. A mycelium is the vegetative portion of a fungus. It is through this root-like substance that the fungus absorbs nutrients.