Steam distillation. Steam distillation can keep the basic components of frankincense oil and some natural components at the same time. These ingredients can improve the quality and efficacy of frankincense oil. Frankincense oil extracted by steam distillation can extract higher concentration of essential oil in a short time, and the extraction efficiency is high. Steam distillation is a safe and non-toxic extraction method, which will not do harm to human body. Steam distillation can be applied to different kinds of frankincense materials, including different regions, different seasons and different varieties of frankincense trees.