Fossilized shell powder has been available in Japan as a dietary supplement for 50 years (mined from 15-20 million year old layers). Mamacal 15 million years old is completely weathered, it is a source of calcium that can be gently absorbed into the human body as a non-ionic (deactivated) nutrient in the same way that vegetables, small fish and seaweed are absorbed. 

Fossil shell powder of the right quality strengthens bones and relieves pain.