Not necessarily so.
China IS at the center of the herbal universe .
It all depends on how the herbs were picked and processed, and whether traditional herbal recipes were strictly followed. Herbs should also be shipped and sold in a timely manner, or they ll deteriorate. Sometimes they re neither pure nor natural, and contain chemical contaminates. Unethical manufacturers also switch ingredients, if the genuine herb is in short supply. This has been happening with St. John s Wort, when synthetic chemicals are added.