Our Commitment to Quality

Our reishi mushrooms are cultivated in Japan's northernmost island of Hokkaido. The pristine alpine environment combined with our state-of-the-art technologies and strict production protocols ensures we provide you with the world's highest quality reishi mushroom extract.

100% Pure reishi mushroom (Ganoderma lingzhi) grown in Hokkaido,
100% Pure reishi mushroom (Ganoderma lingzhi) grown in Hokkaido,

Japan’s northernmost prefecture,
known for its pristine environment.

Certified organic by JAS (Japanese Agricultural Standards)
Certified organic by JAS (Japanese Agricultural Standards)

[Not applicable products]
OUKOU Deer horn Reishi Capsule,
REISENMEITO Reishi Gold Capsule,
OUKOU β-glucan tablets,
Red Reishi Extract Powder,
YASOKOSO Reishi Mix Enzyme,
Reishi Coffee




Vegan (no animal products)
Vegan (no animal products)

* Not applicable to our
Reisenmeito Reishi Gold Capsules.

Integrated Group Production

To ensure the utmost quality, we use fully integrated production and process that have been painstakingly refined over many years based on scientific methods.

Our pure reishi mushroom products "OuKou" is produced entirely within our group, all the way from the cultivation of the beds to commercialization under the strictest of controls.

We use natural materials and pure water sourced locally in the pristine environment of Hokkaido (Japan's northernmost prefecture) and treat them with our unique technology.

Data on the exact timing of inoculation, planting, and harvesting are carefully managed to ensure traceability and added safety and security.

Strict Production Process

1. Logs: Top-quality logs are harvested during the snowy season when nutrients are abundant and cut to the optimal length.

2. Treatments: Sterilization and other conditioning are applied to the logs to facilitate the perfect culture medium.

3. Conditions: After sealing in a hygienically controlled clean room, the fungus beds are cultivated with the ideal temperature, humidity, water, and light.

4. Harvesting: Once the perfect deer antler reishi mushrooms are ready, we harvest them with great care.

5. Processing: We dry the extract carefully before using it in capsules, sencha (green tea), and other products.

Human clinical trials have been conducted.

Hokkaido Reishi Co., Ltd. in collaboration with Hokkaido University and Hokkaido University of Information Sciences has completed a clinical trial on immune function (NK cell activity) using the Oukou Deer Horn Reishi capsules in May 2022.The study showed that NK cell activity tended to increase after 4 weeks and 12 weeks of taking Reishi. "The innate immune system, which shows the function of NK cells, is important in suppressing the onset of viral infections and cancer, and we expect that Deer Horn Reishi will prove useful in the future," according to the study. The research results have been submitted for publication in the journal "Pharmacology and Therapeutics.

The messages from our Reishi Lab

Comparison of various triterpenoid contents of Red Ganoderma lucidum before and after spore release
We give priority to the content of active ingredients rather than yield, and we harvest the highest content of various triterpenoids before spore release for commercialization.

(Based on the analysis results of joint research with the Faculty of Agriculture, Kyushu University).