INGREDIENT
Red 40
A synthetic red food dye.
Why it turns up in dog food
- Included to color the food, which appeals to the person buying it rather than the dog. It adds no nutrition.
An ingredient on its own tells you very little.
What matters is how much of it there is and where it sits in the list. That is why we weigh
the top five rather than reacting to any single name further down.
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