Oyster Shell
mineral ingredient
What is it?
Oyster Shell is a source of minerals. Graded good: a real, recognisable ingredient that adds nutritional value, so it lifts a product’s score.
Other names on labels: oyster shell powder
At a glance
- Base score
- 1 (from −1 to 1; higher is better)
- Found in
- 10 products
Products containing oyster shell
Results reflect the latest label we hold for each product, not a live check of today's recipe. Open a product to see its source and last-checked date.
Common questions about oyster shell
Is Oyster Shell good for dogs?
Yes, we grade it as a good ingredient: recognisable and nutritionally useful, so it lifts a product’s score. Bear in mind that no single ingredient decides quality; the whole recipe and its balance matter more.
What is oyster shell in dog food?
Oyster shell is a natural source of calcium carbonate, often added to dog food as a mineral supplement to help balance the diet. It is usually listed on labels as oyster shell or oyster shell powder.
Is oyster shell safe for dogs with a shellfish allergy?
Some dogs with shellfish sensitivity may react to oyster shell, so it is best to speak to your vet before feeding a food that contains it.
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How many UK dog foods contain oyster shell?
10 UK products list oyster shell as an ingredient in our database. The full list is shown above, sorted by rating.
What else is oyster shell called on labels?
Manufacturers can also list it as oyster shell powder. We match this to the same glossary entry when we read a label.
How does Open Dog Food grade oyster shell?
We grade it good, our highest grade, reserved for recognisable ingredients that add real nutritional value. Every ingredient is converted to its dry-matter share and scored from our glossary before a recipe gets its 1-100 rating; the full method is on our methodology page.