Oyster shell powder, particularly in its pharmaceutical grade form, is a fine powder derived from crushed oyster shells. Here are some key details:

Composition:
1. Main Component: Primarily composed of calcium carbonate (CaCO₃), which constitutes about 95% of the powder.
2. Trace Minerals: May also contain other minerals like magnesium, phosphorus, and trace elements beneficial for health.

Pharmaceutical Uses:

1. Calcium Supplement: Commonly used as a dietary calcium supplement to support bone health and prevent osteoporosis.
2. Antacid: Acts as an antacid to relieve heartburn and indigestion due to its alkaline properties.
3. Pharmaceutical Excipients: Used as an excipient in tablet formulations due to its binding and bulking properties.

Quality Standards:

1. Purity: Pharmaceutical grade oyster shell powder must meet stringent purity and quality standards set by regulatory bodies, such as the FDA or USP (United States Pharmacopeia).
2. Microbial Testing: Should undergo microbial testing to ensure it is free from contaminants.

Safety and Storage:

1. Safety: Generally recognized as safe (GRAS) when used appropriately, but it is essential to follow recommended dosages.
2. Storage: Should be stored in a cool, dry place away from moisture to prevent clumping and degradation.

Applications in Other Industries: Beyond pharmaceuticals, oyster shell powder is also used in cosmetics, food products, agriculture (as a soil conditioner), and as a natural abrasive.

If you need more specific information or have further questions, feel free to ask!