Linseed oil is an edible oil derived from the flax plant. It is high in ?-linoleic acid and has unique hydrophobic properties that help it to reduce moisture and seal porous surfaces. These properties are believed to be responsible for its effective reduction of microorganisms and fungal infections. Linseed oil is also a commonly used carrier, adjuvant, and inert ingredient in pesticide formulations. The EPA last reviewed the registration of linseed oil in 1993, prior to its being listed as a 25(b)-eligible active ingredient in 1996. Despite it’s long history, there is very little data on its safe use.