Swanson Full Spectrum Shiitake Mushroom supplement is part of an herbal tradition that dates back centuries. Like the other herbals in the Swanson Premium Full Spectrum line, this Shiitake Mushroom dietary supplement is a 100% pure traditional herbal. Nothing fancy, just pure, high-quality, whole-herb Shiitake Mushroom at an affordable price... something you expect from Swanson Health Products. It is sourced from its native location, tested for purity and safety and manufactured under the strictest quality controls. Carry on the herbal tradition and build the bridge of wellness between the past, present and future with Full Spectrum Shiitake Mushroom.