Lime essential oil has always traditionally been made from the cold pressed peel of the fruit. However, the resulting oil is highly phototoxic from the bergapten content, thus restricting its use. Steam distillation removes the problem and now the oil can be used much more.
Limes were introduced into Spain in the Middle Ages by the Moors.
The ships carrying them used it to prevent scurvy on the long voyages and, when the fruits were shipped to the Americas, the sailors were called “limeys”.