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Medium quality ingredient - nutritionally adequate and unlikely to cause any problems e.g. fillers etc
Alginate in dog food
Alginates (E401) are long chain molecules occurring naturally in brown algae. They may also be listed as alginic acid, algin gum or sodium/potassium alginate. When mixed with water, alginate forms a viscous gel, which has led to its inclusion in a lot of wet paté type foods as a gelling agent to help provide their firm consistency.
While alginate is certainly less contentious than some alternative gelling agents, it has been linked to skin irritation and respiratory sensitivity  so if your dog is experiencing either of those problems on a food containing alginate, it may be worth trialling an alternative that doesn't contain the ingredient.