Oyster calcium carbonate is made from the shells of Marine organisms by high-temperature calcination and electrolytic activation. Oyster shells contain more than 90% calcium carbonate and are white powder in appearance, containing abundant calcium and trace elements required by human body such as manganese, zinc, silicon and phosphorus. Oyster calcium carbonate is superior to traditional calcium in terms of solubility and absorption. It is also called "active calcium.
Our GMP oyster shell calcium carbonate is high quality light calcium carbonate calcined at high temperature  It's white powder, with fine and uniform particles, good suspension and dispersion properties and high absorptivity. It has high purity and few impurities and suitable for health supplyment products.

Item	Standard
Appearance	White powder
Identification	Positive response
Alkalinity	pH should not exceed 10.5
Insoluble matter in acid	The residue left behind shall not exceed 0.2%
Drying loss	Not more than 0.5%
Heavy metal	No more than 0.0015%
Arsenc salt	Not more than 0.0001%
Content determination	According to the calculation of dry products, calcium carbonate in calcium (Ca) should be 39.4~40.4%