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Ostrea Shell Powder
Ostrea Shell Powder
Low concern
Oyster shell calcium is a calcium carbonate source. Calcium carbonate is GRAS as a food additive.
Found in
4 products
What it is
Powdered oyster (Ostrea) shell; primarily calcium carbonate.
Used as a calcium supplement or fortificant; predominantly cosmetic and supplement use.
Why it's flagged
- potential heavy metal contamination if not purified
- shellfish-source allergen flag
What regulators actually say
"Calcium carbonate (CaCO3, CAS Reg. No. 471-34-1) is the carbonic salt of calcium... is generally recognized as safe."
Regulatory status
United States — FDA
Calcium carbonate GRAS (21 CFR 184.1191).
European Union — EFSA
Calcium carbonate (E170) permitted.
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