Eating Boiled and Ground Eggshells: Why It’s Not a Safe Calcium Source

of the digestive tract

In rare cases, small shell fragments could theoretically cause more serious injury

Commercial calcium supplements are milled to a consistent, safe particle size. Home grinders cannot guarantee this.

No Quality Control or Dosage Consistency
One eggshell contains approximately 2,000 mg of calcium carbonate (about 800 mg of elemental calcium)

But shell thickness varies by hen age, breed, and diet

Grinding produces inconsistent particle sizes

Without lab testing, you have no way to know the actual calcium content per teaspoon

Compare that to a regulated supplement:

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