The Kongtong Tableland of Gansu Province has a long history of more than two thousand years of cultivation of perilla oil. The unique planting mountainous area at an altitude of 2,000 meters creates the distinctive natural characteristics and quality of OLaheyâ Perilla Oil. The extracted essential oil is rich in а-linolenic acid up to 60% or more, which has significant health and medical effects on the human body, known as "natural plant DHA."