Oyster shell calcium is calcium carbonate milled and purified from oyster shells (CaCO3, CAS 471-34-1), which are typically 95 to 97% calcium carbonate, giving roughly 38 to 40% elemental calcium, close to refined mineral carbonate. Because it is derived from a marine mollusc it is an animal-origin material rather than vegan, and as a shellfish-derived ingredient it is declared for the mollusc allergen. Like mined carbonate it is essentially water-insoluble. It is an off-white to pale powder manufactured into tablets, capsules and powder blends.
- Tablets
- Capsules
- Powders
Applications
Calcium supplements, multivitamins and chewable tablets.
Documentation & quality
Every order is backed by the documents your quality team files, and the controls behind them.
Certificate of Analysis
every batchSpecification sheet
on requestAllergen statement
on requestGMO statement
on requestTraceability
on requestSafety Data Sheet
where applicableHow it’s controlled
- Identity verified on every incoming raw material
- Screened for heavy metals and microbial contaminants
- Full batch and lot traceability
- Produced under our certified NSF GMP system
Other forms of Calcium
Calcium Carbonate
Calcium carbonate
- CAS
- 471-34-1
- Formula
- CaCO3
- Elemental
- ~40% Ca
- Vegan
- Gluten-free
- Non-GMO
Calcium Citrate
Tricalcium dicitrate
- CAS
- 813-94-5
- Formula
- C12H10Ca3O14
- Elemental
- ~24% Ca (anhydrous; ~21% as tetrahydrate)
- Vegan
- Gluten-free
- Non-GMO
Calcium Citrate Malate
Calcium citrate malate (CCM)
- CAS
- 142606-53-9
- Elemental
- ~24% Ca (variable ratio)
- Vegan
- Gluten-free
- Non-GMO
Calcium Gluconate
Calcium D-gluconate
- CAS
- 299-28-5
- Formula
- C12H22CaO14
- Elemental
- ~9% Ca
- Vegan
- Gluten-free
- Non-GMO
Calcium Lactate
Calcium 2-hydroxypropanoate
- CAS
- 814-80-2
- Formula
- C6H10CaO6
- Elemental
- ~18% Ca (anhydrous; ~13% as pentahydrate)
- Vegan
- Gluten-free
- Non-GMO
Calcium Ascorbate
Calcium L-ascorbate
- CAS
- 5743-27-1
- Formula
- C12H14CaO12
- Elemental
- ~10% Ca
- Vegan
- Gluten-free
- Non-GMO
Calcium Bisglycinate
Calcium bis(glycinate)
- CAS
- 35947-07-0
- Formula
- C4H8CaN2O4
- Elemental
- ~21% Ca
- Vegan
- Gluten-free
- Non-GMO
Tricalcium Phosphate
Tricalcium bis(phosphate)
- CAS
- 7758-87-4
- Formula
- Ca3(PO4)2
- Elemental
- ~39% Ca
- Vegan
- Gluten-free
- Non-GMO
Microcrystalline Hydroxyapatite (MCHC)
Hydroxyapatite (pentacalcium hydroxide tris(phosphate))
- CAS
- 1306-06-5
- Formula
- Ca5(PO4)3(OH)
- Elemental
- ~40% Ca (mineral phase; lower in whole-bone ingredient)
- Gluten-free
- Non-GMO
Marine Algae Calcium (Aquamin)
Calcium carbonate (calcified red algae, Lithothamnion)
- CAS
- 471-34-1
- Formula
- CaCO3
- Elemental
- ~32% Ca
- Vegan
- Gluten-free
- Non-GMO
Calcium Lactate Gluconate
Calcium lactate gluconate
- CAS
- 11116-97-5
- Formula
- C42H78Ca5O48
- Elemental
- ~13% Ca
- Vegan
- Gluten-free
- Non-GMO
Dicalcium Phosphate
Calcium hydrogen phosphate (dibasic)
- CAS
- 7757-93-9
- Formula
- CaHPO4
- Elemental
- ~29.5% Ca (anhydrous; ~23% as dihydrate)
- Vegan
- Gluten-free
- Non-GMO
Calcium Malate
Dicalcium malate dihydroxide
- CAS
- 671197-49-2
- Formula
- C4H6Ca2O7
- Elemental
- ~29% Ca (dicalcium malate dihydroxide)
- Vegan
- Gluten-free
- Non-GMO
Monocalcium Phosphate
Calcium dihydrogen phosphate (monobasic)
- CAS
- 7758-23-8
- Formula
- Ca(H2PO4)2
- Elemental
- ~17% Ca (anhydrous)
- Vegan
- Gluten-free
- Non-GMO
Calcium Glycerophosphate
Calcium glycerophosphate
- CAS
- 27214-00-2
- Formula
- C3H7CaO6P
- Elemental
- ~19% Ca
- Vegan
- Gluten-free
- Non-GMO
Calcium Orotate
Calcium orotate
- CAS
- 22454-86-0
- Formula
- C10H6CaN4O8
- Elemental
- ~11.4% Ca
- Vegan
- Gluten-free
- Non-GMO
Calcium Aspartate
Calcium bis(L-aspartate)
- CAS
- 39162-75-9
- Formula
- C8H12CaN2O8
- Elemental
- ~13.2% Ca
- Vegan
- Gluten-free
- Non-GMO
Calcium Pyruvate
Calcium dipyruvate
- CAS
- 52009-14-0
- Formula
- C6H6CaO6
- Elemental
- ~18.7% Ca
- Vegan
- Gluten-free
- Non-GMO
Calcium Acetate
Calcium acetate
- CAS
- 62-54-4
- Formula
- C4H6CaO4
- Elemental
- ~25.3% Ca
- Vegan
- Gluten-free
- Non-GMO
Calcium Sulfate
Calcium sulfate
- CAS
- 7778-18-9
- Formula
- CaSO4
- Elemental
- ~29.4% Ca (anhydrous; ~23% as dihydrate)
- Vegan
- Gluten-free
- Non-GMO
Calcium Chloride
Calcium chloride
- CAS
- 10043-52-4
- Formula
- CaCl2
- Elemental
- ~36.1% Ca (anhydrous)
- Vegan
- Gluten-free
- Non-GMO
Calcium Hydroxide
Calcium hydroxide
- CAS
- 1305-62-0
- Formula
- Ca(OH)2
- Elemental
- ~54.1% Ca
- Vegan
- Gluten-free
- Non-GMO
Calcium Pidolate
Calcium bis(5-oxo-L-prolinate)
- CAS
- 31377-05-6
- Formula
- C10H12CaN2O6
- Elemental
- ~13.5% Ca
- Vegan
- Gluten-free
- Non-GMO
Coral Calcium
Calcium carbonate (marine coral)
- CAS
- 471-34-1
- Formula
- CaCO3
- Elemental
- ~24-38% Ca (with trace magnesium and minerals)
- Gluten-free
- Non-GMO
Eggshell Calcium
Calcium carbonate (eggshell)
- CAS
- 471-34-1
- Formula
- CaCO3
- Elemental
- ~38-39% Ca
- Gluten-free
- Non-GMO