"Synthetic color additive (FD&C Blue No. 2, indigotine) approved for use in pet food."
No nutritional purpose — purely cosmetic, for the human shopper's benefit rather than the pet's. Blue 2 has shown tumor associations in animal studies, the same concern flagged for the other synthetic dyes on this list.
A meaningful red flag: an unnamed source, heavy processing into a by-product or digest form, or documented regulatory scrutiny in at least one country. -4 pts deducted.
Rated D (-4 pts) by PetPro-tectors™. No nutritional purpose — purely cosmetic, for the human shopper's benefit rather than the pet's. Blue 2 has shown tumor associations in animal studies, the same concern flagged for the other synthetic dyes on this list.
Synthetic color additive (FD&C Blue No. 2, indigotine) approved for use in pet food.