A soothing mucilage obtained from the seed is used externally as a poultice for boils and burns, and internally as a demulcent, soothing inflamed or irritated mucous membranes, and as a laxatie. The fibers are spun to make linen. Linseed oil, a drying agent in paints and varnishes and an element in the production of oilcloth and linoleum, is extracted from the flax seed. Flaxseed oil residue is made into a fattening agent for cattle.
Immature seedpods can cause poisoning.