Nissan Reishi - Quality and Safety Measures and Updates after 311

To ensure product safety for Nissan Reishi since the Fukushima nuclear power plant accident on March 11, 2011, Nissan Chemical Corporation closely monitors radiation levels at every stage of production from cultivation to the final finished product.

With the most stringent quality control in place, each and every lot of cultivating materials, raw materials, and finished products are tested for radioactivity and no contamination has been detected.

  1. Nissan Chemical Corporation closely monitors the daily measurements of radioactive doses at various sites reported by the Japanese government. The figure below shows the radioactive doses of the major cities in Japan including cities near Kanagawa and Hokkaido prefectures where Nissan Reishi farms are located.

Distance from Fukushima Daiichi Nuclear Plant and Radiation Dose Measurements (February 19, 2016)+


Environmental Radioactivity Levels in World Cities+

  1. Reishi mushroom is cultivated in greenhouses which minimizes airborne radioactive contamination.
  1. Radioactive materials, I-131, Cs-134 and Cs-137, are not detected in the soil and water used in the Nissan Reishi cultivation farms.
  1. The radiation dose of the reishi fruiting body at the Nissan Reishi farms and the background are both measured to be 0.055μSv/h. This confirms that the reishi fruiting body is not contaminated with radiation.

Photos were taken at the Nissan Reishi farms in Kanagawa on December 2011.


  1. Since the incident, contamination has not been detected in any lot of Nissan Reishi. See below for the most recent finished product lot tests (updated February 26, 2016).


Japan Travel Updates after the 3.11 Earthquake. Information retrieved from: