Ovum Shell Powder
Eggshell powder is primarily calcium carbonate and is used as a calcium source. It is derived from eggs, which are a major food allergen requiring labeling; however, processed eggshell typically lacks egg-protein allergen residues if cleanly produced.
What it is
Powder produced from milled and processed eggshells; primarily calcium carbonate (~94-95%) with trace minerals.
Calcium fortification source; sometimes used as a calcium supplement.
Why it's flagged
- Allergen risk if egg-protein residues remain
- Quality depends on processing/sterilization
What regulators actually say
"Chicken eggshell powder is rich in calcium (about 380 mg/g) and other elements ... There are several clinical studies showing that eggshell powder has positive effects on bone and cartilage."
Regulatory status
United States — FDA
Egg is a major allergen requiring declaration
European Union — EFSA
EFSA has published opinions on calcium sources; egg is regulated allergen
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