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Fossilized oyster shells are reportedly free from contamination of the industrial revolution.
Coral LLC has found an untapped source of calcium in oyster shells that are fossilized above sea level. The company is marketing this calcium material in several particle sizes and as compressed tablets.
Oyster shells can be sourced directly from the sea, but these shells do run the risk of contamination from river runoff, radiation, and even oil spills. Fossilized oyster shells are extracted form ancient Caribbean shell beds. The distinction, says Coral LLC, makes for “the purest oyster shell calcium product” currently available.
Friends of the Sea has endorsed Coral LLC’s product for production and harvest methods that do not impact the seabed.