Vitamin E Supplement in dog and cat food

Is it OK for dogs and cats?

Dogs

No known concern at the amounts used in complete dog foods: vitamin E is a required nutrient, and EFSA found the usual acetate form safe for all animal species under authorised use. Merck calls it one of the least toxic fat-soluble vitamins; very high doses can interfere with absorption of vitamins A, D and K.

Cats

No known concern at the amounts used in complete cat foods. Needs rise with polyunsaturated fat, especially fish oil, and deficiency has caused pansteatitis ('yellow fat disease') in cats fed large amounts of canned tuna.

How settled this is: No known concern at the amounts used in complete foods

What vitamin e supplement is

Added vitamin E. The reference form is dl-alpha-tocopheryl acetate, also called all-rac-alpha-tocopheryl acetate, where 1 mg equals 1 IU of vitamin E. In 2023 the EU renewed its authorisation as a nutritional feed additive for all animal species (vitamin E, 3a700) until March 2033, together with RRR-alpha-tocopheryl acetate (1.36 IU per mg); the authorisation of RRR-alpha-tocopherol as a nutritional additive expired. US feed rules list alpha-tocopherol acetate as generally recognised as safe under good manufacturing or feeding practice.

Why it is in pet food

Dogs and cats need vitamin E, and FEDIAF publishes minimum levels for complete foods: about 3.6-5.0 IU per 100 g dry matter for dogs and 3.8-5.1 IU for cats, depending on life stage and expected energy intake. FEDIAF notes that requirements depend on the food's polyunsaturated fat content, especially from fish oil, and on other antioxidants present. For cat food it recommends 5-10 IU of vitamin E above the minimum for each gram of fish oil added per kg of diet.

What it does in the food

Vitamin E works as an antioxidant. Merck explains that deficiency signs mostly come from oxidative damage to polyunsaturated fats in cell membranes. In dogs, deficiency has been linked to muscle degeneration and weakness, reproductive problems, retinal degeneration, brown pigment in intestinal muscle, poor appetite and listlessness. In cats, signs include inflammation of heart and skeletal muscle, liver changes and steatitis; cats fed large amounts of canned tuna have developed pansteatitis ('yellow fat disease').

Safety and limits

EFSA's 2021 renewal assessment concluded that all-rac-alpha-tocopheryl acetate remains safe for all animal species, consumers and the environment under the authorised conditions, and the EU renewed the authorisation in 2023 with no maximum content. EFSA had earlier found information on vitamin E excess (hypervitaminosis E) not consistent enough to derive a maximum. FEDIAF likewise lists no maximum for dogs or cats. Merck calls vitamin E one of the least toxic fat-soluble vitamins but notes that very high doses can interfere with absorption of vitamins A, D and K. In cats being treated for hepatic lipidosis, Merck cautions that too much vitamin E can cause oxidative injury and interfere with vitamin K-dependent clotting.

What depends on the amount and the recipe

How much vitamin E a food needs depends on its polyunsaturated fat content (fish oil in particular) and on the other antioxidants present. The form changes potency per mg: dl-alpha-tocopheryl acetate 1 IU, d-alpha-tocopherol 1.49 IU and d-alpha-tocopheryl acetate 1.36 IU, while FEDIAF's table gives dl-delta-tocopherol 0.25 IU and dl-gamma-tocopherol 0.01 IU. Merck links problems to very high doses.

Not the same as

• Mixed tocopherols (E306) — Used as a preservative to stop fats going rancid. Tocopherols other than alpha have much lower vitamin E value in FEDIAF's conversion table (delta 0.25 IU/mg, gamma 0.01 IU/mg).
• Alpha-tocopherol as an antioxidant additive (EU 1b307) — EFSA's 2021 opinion notes that alpha-tocopherol is also authorised in the EU as a technological antioxidant (1b307), a different use from the nutritional vitamin E authorisation (3a700).
• d-alpha-tocopherol / d-alpha-tocopheryl acetate (RRR forms) — Other forms of vitamin E that give more vitamin E per mg (1.49 and 1.36 IU) than dl-alpha-tocopheryl acetate (1 IU). In the EU's 2023 renewal, RRR-alpha-tocopheryl acetate stayed authorised as a nutritional additive, while the authorisation of RRR-alpha-tocopherol expired.

Sources

1. Nutritional Requirements of Small Animals (full review Nov 2023, updated Sept 2024) — Merck Veterinary Manual, 2024. Vitamin E is an antioxidant; deficiency signs in dogs and cats; pansteatitis in cats fed large amounts of canned tuna; one of the least toxic fat-soluble vitamins, very high doses antagonise absorption of vitamins A, D and K; mixed tocopherols used to prevent oxidation and rancidity of fat.
2. Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs (September 2025) — FEDIAF (European Pet Food Industry Federation), 2025. Minimum vitamin E levels for dogs and cats with no maximum; requirement depends on PUFA and other antioxidants, higher with fish oil; 5-10 IU per gram fish oil per kg cat food; IU conversion table for tocopherol forms.
3. Commission Implementing Regulation (EU) 2023/341 concerning the renewal of the authorisation of vitamin E as a feed additive for all animal species and repealing Regulation (EU) No 26/2011 (OJ L 48, 16.2.2023) — EUR-Lex, Publications Office of the European Union, 2023. Renews vitamin E as all-rac-alpha-tocopheryl acetate (3a700, 3a700i) and RRR-alpha-tocopheryl acetate (3a700ii) as nutritional additives for all animal species until 8 March 2033, with no maximum content; labelling equivalences 1 IU and 1.36 IU per mg; authorisation of RRR-alpha-tocopherol expired; cites EFSA's 2021 conclusion that vitamin E remains safe for all animal species, consumers and the environment.
4. Assessment of a feed additive consisting of all-rac-alpha-tocopheryl acetate (vitamin E) for all animal species for the renewal of its authorisation (NHU Europe GmbH). EFSA Journal 19(4):6533 — EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), via PubMed Central, 2021. Use under authorised conditions remains safe for target species, consumers and environment; at the time authorised without a maximum content; earlier finding that hypervitaminosis E data were not consistent enough to derive a maximum; alpha-tocopherol separately authorised as a technological antioxidant (1b307) as of 2021.
5. 21 CFR 582.5892 alpha-Tocopherol acetate (CFR 2025 edition) — US Code of Federal Regulations, via govinfo.gov, 2025. Alpha-tocopherol acetate is generally recognised as safe when used in accordance with good manufacturing or feeding practice.
6. Feline Hepatic Lipidosis (full review Aug 2023, updated Jun 2025) — Merck Veterinary Manual, 2025. In cats treated for hepatic lipidosis, too much vitamin E can cause oxidative injury and interfere with vitamin K-dependent clotting factor activation.

Checked against these sources on 2026-10-15. Definitions are in our own words. This is a reading aid, not veterinary advice: a vet who knows your animal comes first.