Description: We prepare our Coltsfoot Extract from the fresh flowering tops of Tussilago farfara plants which are Custom Wildcrafted? in their natural wild habitat, and are never fumigated or irradiated. Through our special extraction process we are able to produce an aromatic, constituent-rich extract that contains less than 1 part-per-million (ppm) of Colfsfoot's potentially toxic pyrrolizidine alkaloids. Caution: Keep Out of the Reach of Children.