Onion oil when massaged on the scalp enables you to retain the natural luster of the hair. But it is crucial to emphasis on the way one massages the oil into the hair. Rapid and rough application can do more damage than being a source of advantage. This way of application may disrupt the position of the roots of the hair and cause hair loss. Application Onion oil demands a gentle hand. The oil must be poured onto the centre of the scalp and then must be massaged all over the scalp in a particular direction. Emphasis must be laid on massaging it in the scalp and not in the hair. It will automatically penetrate into the hair once the scalp has absorbed enough.