Our Roots

Yonaguni Island, Okinawa

Founded in 1977, Coral International manufactures mineral materials and various products using fossil coral harvested from our own mines in Yonaguni Island, Okinawa. Employing our proprietary processes of crushing, washing, refining, pulverizing, purifying, testing and packaging, we tailor our products to fit the needs of customers in the fields of agriculture, livestock farming, water filter manufacturing, foods and beverages, nutritional supplements and cosmetics.
By collecting and analyzing feedback from our customers concerning the uses, effects and benefits of our products, we have been able to greatly expand our user base throughout Japan and abroad. Our affiliated researchers and scientists are continually finding new ways to improve and apply our products and materials, making them even more beneficial. Some of these developments have been patented.

Yonaguni Island, Okinawa

Our Core Values

Utilizing the Power of Nature

Through our harvesting and processing of fossil coral, we have come to understand that it plays a significant role in the earth’s biomineral cycle, wherein fossil coral minerals support the healthy growth of plants and animals, as well as the health of people. Without causing any disruption to the natural ecosystem, natural fossil coral helps living things optimize their basic vitality by taking full advantage of the power of nature.

Kumamoto factory

Our Mission

To Be a Provider of Totally Natural Mineral Fossil Coral for Healthy Living

We recognize that coral is a true blessing of nature to all living things. Our mission is to transfer this marvelous resource to the lives of human beings by developing various applications ourselves, as well as providing this natural material to global manufacturers in such industries as health food, nutrient supplements, cosmetics, feedstuffs and filtration agents, thus deriving maximum benefit from this gift of nature.

Tachigami-iwa. Yonaguni Island, Okinawa


Collaborative Research with Obihiro University of Agriculture and Veterinary Medicine (Aug 2003 through Mar 2004)
Subject: Research on the application of calcium feedstuff originating in natural fossil coral to livestock.
Contract Research with the Faculty of Medicine, University of the Ryukyus (Professor Fusako Maehira, July 2004 through Mar 2005)
Subject: Comparative study on the effect of three kinds of calcium raw materials on bone formation and resorption (anti-osteoporosis effect).
Contract Research with Professor Masateru Koiwa of Rakuno Gakuen University, Hokkaido
Subject: Research on the effect of natural calcium preparation to mycotoxin adsorption (Oct 2004 through Dec 2005).
Subject: Research on the milk fever prevention effect of soluble coral powder concentrate (June 2006 through Mar 2007).
Contract Research with Kitasato Research Center of Environmental Sciences
Subject: Antibacterial confirmation test of fossil coral powder (Sep 2006).
Subject: Bactericidal effect confirmation test of solubility coral powder (Feb 2007).


Patent registration: ULCAL
Feedstuff Additives for Mycotoxin Removal, (Patent No.4295761).
Patent registration: MEIULCAL
Milk fever prevention agent, feedstuff to prevent milk fever and precautionary measures for milk fever (Patent No.4614202).

Certification and Declaration

GMP certified by JHNFA (Japan Health and Nutrition Food Association).
Absence of substances as per WADA List (World Anti-Doping Agency).