I personally haven't heard of any contact allergies from cats using our litter or other soy litter. I would assume consumption of soy in the form of food/treats is a much different allergen risk and if any symptoms present for your kitty we recommend to discontinue the Really Great Cat Litter and reach out to your local veterinarian just incase.
Our litter does not contain tree nuts or sesame but unfortunately, we cannot guarantee 100% that there isn't any trace contamination as the manufacturing facility is not certified nut-free/sesame-free. We also can't guarantee that the sub-suppliers from whom we purchase raw ingredients do not handle any allergens in their facility/warehouse.
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