The majority of Tonic herbs are wild plants, harvested in forests in an ancient tradition by sanctioned collectors. Great care is taken to insure the herbs are gathered sustainably, with minimal damage to the environment. Rehmannia sources his herbal powdered extracts from pristine regions in the northern Manchurian province of China, as well as the Korean countryside. This region is geographically similar to Maine, hosting many protected biospheres which are monitored by the United Nations and the Chinese government. The herbs selected from these wild forests are designated “Di Tao,” meaning they are guaranteed pure, and sustainably collected from the region of their biological origin. We provide lab analysis (COA’s) upon request.