Many people throw eggshells away without realizing they are made primarily of calcium carbonate—the same form of calcium found in many supplements. Eggshells have gained attention as a natural source of calcium, but they should be used carefully and only after proper preparation to reduce the risk of bacterial contamination. While some research suggests eggshell powder may be an effective calcium source, more studies are needed, and it should not replace medical advice or a balanced diet.
In this guide, you’ll learn the potential benefits of eggshells, how to prepare them safely, and important precautions to keep in mind.
What Makes Eggshells Special?
An eggshell is composed of approximately:
- 95% calcium carbonate
- Small amounts of magnesium
- Phosphorus
- Potassium
- Sodium
- Trace minerals
One average eggshell contains about 2,000 mg of calcium, making it a very concentrated calcium source.