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500 mg of calcium derived from oyster shells per tablet. Compare to active ingredient in 500 mg Os-Cal® tablets – a registered trademark of Aventis Holdings.. 300 tablets per bottle.
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![Major Pharmaceuticals - Joint Health Supplement Major® Oyster Shell Oyster Shell Calcium 500 mg Strength Tablet 300 per Bottle [1/BT]](http://everydaysupplyco.com/cdn/shop/files/33caed0eeeab856583a12e2a44f981348d86891b.jpg?v=1742839549&width=2000)
![Major Pharmaceuticals - Joint Health Supplement Major® Oyster Shell Oyster Shell Calcium 500 mg Strength Tablet 300 per Bottle [1/BT]](http://everydaysupplyco.com/cdn/shop/files/33caed0eeeab856583a12e2a44f981348d86891b_1024x.jpg?v=1742839549)