Linseed oil is the oil extracted from flax seeds. Now, you may be wondering that isn’t the oil from flax called Linseed oil. Yes, that’s true. Both Linseed oil and linseed oil start out from the same source – the flax seeds. However, the processing is quite different which leads to marked differences between these oils. Linseed oil is used for various industrial purposes and paint jobs whereas Linseed oil is fit for human consumption.