Selenium is the gene for human longevity, and most of the places with long lives in the world are selenium-rich regions. Chengmai is the only place in Hainan that has been listed by scientists as a selenium-rich area. The selenium content in the soil is over 440 micrograms per kilogram. The crops grown in this selenium-rich soil are rich in mineral trace elements such as calcium, magnesium and selenium. Long-term consumption is very good for health.
Hainan's unique climate is highly suitable for the growth of camellia trees, so the oil pressed from them is more nutritious and of better quality than that from other production areas.