From the Manufacturer:
We prepare our Celery extract from the mature seed of Apium graveolens plants that are Certified Organically Grown without the use of chemical fertilizers, pesticides or herbicides.
To assure optimal extraction of Celery seeds' bioactive compounds, the seeds are harvested only from fully mature, second-year Celery plants, and are then thoroughly extracted.
Our Celery seed is never fumigated or irradiated.