Ancient Greek physicians perscribed mustard plasters for lung congestion; Anglo-Saxons used them for bronchial problems. Research shows that black mustard seeds are an effective external agent for curing below-surface inflammations. The seeds are also the flavoring in table mustard. The greens are a nutritions food, either cooked or added to salads.
A powerful irritant, mustard oil should be used sparingly, in diluted form, and only externally, for short exposure periods.