Three papers on heating of hempseed oil. Callaway’s opinion (#3) is the safest. It’ll convert to trans-fats when cooled. Courtesy of the Journal of the International Hemp Association. Click title for the paper.
1: Trans-fatty acids in heated hemp seed oil
by H. Mölleken
3: Formation of trans-fatty acids in heated hempseed oil: A rebuttal
by J. C. Callaway