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

milks ~30% Often comparable to dairy
Leafy greens (kale, bok choy) ~40-50% High absorption but lower total calcium
Calcium supplements (citrate/carbonate) ~20-40% Varies by formulation and timing
Eggshell powder Unknown / likely lower No robust human studies support its bioavailability
The takeaway: Calcium from whole foods is well-studied, reliable, and proven. Eggshell powder is not.

Physical Irritation Risk
If you don’t grind eggshells into an extremely fine powder (which requires a high-powered blender or grinder), you risk:

Sharp particles scratching the delicate lining of your throat or esophagus

Potential irritation

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