Vitamin E Supplement

Vitamin E is an antioxidant: it protects cell membranes and the fats in the body from damage. Pets get it only from food. On labels it’s most often alpha-tocopherol acetate, a form that survives cooking and storage.

The need for it rises with the amount of polyunsaturated fat in the food, so foods rich in fish oil generally need more. It isn’t the same job as “mixed tocopherols” further down many labels: those are mainly there to keep the food’s fat from going rancid.