Mark Timon’s answer: This is an easy answer. No! The curcuminoid extract material is not irradiated. Irradiation is a sure-fire way to sterilize a material in order to guard against bacterial and viral contamination. The extraction process itself does that job, however, in the case of botanical extracts.
Vibrant Health, by-the-way, DOES NOT purchase irradiated raw materials, which usually refers to gamma irradiation. I say usually, because a new ultraviolet light irradiation technique is presenting itself, and seems to do no harm to nutrients and bioactive substances in the treated materials. We have not yet bought any UV sterilized materials, and continue to rely on steam sterilized plant materials when needed.