Vitamin E is an essential fat-soluble antioxidant, and it appears on more than a third of the dog skin and coat products we compared. One small placebo-controlled trial found that vitamin E lowered skin-lesion scores in dogs with atopic dermatitis who were also taking an antihistamine. There is no controlled trial for coat shine in healthy dogs, and in many fish-oil products vitamin E is included mainly to keep the oil from oxidizing.
Key takeaways
- In 29 dogs with atopic dermatitis on fexofenadine, vitamin E at 8.1 IU/kg a day for eight weeks gave lower lesion (CADESI-03) scores than placebo.
- Dogs with atopic dermatitis have been reported to have lower blood vitamin E than healthy dogs, which fits the idea of a benefit but does not prove one.
- We found no controlled trial of vitamin E for coat quality in healthy dogs.
- In 57 dogs with osteoarthritis, vitamin E did not improve pain or lameness.
- Complete dog foods already contain vitamin E; deficiency is rare.
What vitamin E does
Vitamin E is a family of compounds (tocopherols and tocotrienols); alpha-tocopherol is the main active form. It protects fats in cell membranes — including skin cells — from oxidative damage. Allergic skin inflammation generates oxidative stress, which is the rationale for supplementing it in atopic dermatitis. Vitamin E is required in the diet, and complete commercial dog foods must meet a minimum level.
What the canine skin evidence shows
Atopic dermatitis: one positive trial
In a 2014 randomized, placebo-controlled trial, 29 dogs with atopic dermatitis received either vitamin E (8.1 IU/kg once daily by mouth, 14 dogs) or mineral oil as placebo (15 dogs) for eight weeks. All dogs also received the antihistamine fexofenadine. The vitamin E group had higher blood vitamin E and antioxidant capacity, and lower skin-lesion scores (CADESI-03) throughout treatment than the placebo group. The published abstract emphasizes the lesion scores; we could not confirm a significant difference in itch intensity, which was also measured.
It is a well-designed small trial, but it is one trial, all dogs were on another medicine, and it has not been independently repeated.
Why vitamin E status might matter
An earlier study by the same group found lower plasma vitamin E concentrations in dogs with atopic dermatitis than in healthy dogs. That supports a biological link, but lower levels in sick dogs can be a consequence of inflammation rather than a cause.
Coat quality: no trial
We did not find a controlled trial of vitamin E for dull coat, dry skin or shedding in otherwise healthy dogs. Coat-quality evidence exists for fish-oil omega-3s — see fish oil for skin and coat.
Vitamin E in fish-oil products
Fish oil is rich in fragile polyunsaturated fats that oxidize quickly, producing off smells and potentially harmful compounds. Manufacturers add vitamin E, often as “mixed tocopherols”, to protect it. In our comparison, 98 of the 103 products that list vitamin E also contain fish oil or another omega-3 source, where vitamin E plays this preservative role, usually in small amounts. That is good practice for oil quality, but it is not the same as a therapeutic dose, and it is not why the product might help skin.
Vitamin E for joints: a negative trial
A 2023 randomized, blinded, placebo-controlled trial in 57 dogs with naturally occurring osteoarthritis gave vitamin E or placebo for 90 days. Vitamin E did not improve pain, lameness, quality of life or the need for rescue pain medication.
Dose and safety
The atopic dermatitis trial used 8.1 IU per kg once daily — about 80 IU for a 10 kg dog and 240 IU for a 30 kg dog. Vitamin E has a wide safety margin, but it is fat-soluble and stored in the body, and very high doses may interfere with blood clotting. Talk to your veterinarian before long-term high-dose use, especially if your dog takes anticoagulants or is scheduled for surgery. If you combine several supplements, add up the vitamin E from all of them.
How to read the label
- Is vitamin E listed in IU per chew or capsule? If it is only in the “other ingredients” or listed as mixed tocopherols, it is most likely a preservative.
- Is it natural (d-alpha-tocopherol) or synthetic (dl-alpha-tocopherol)? IU already adjusts for potency, so compare IU rather than mg.
- What is the main active? For skin, EPA and DHA amounts matter more — see EPA and DHA on dog fish-oil labels.
For a full checklist, see How to check a dog skin & coat supplement label.
Dog Supplement Facts evidence status
INSUFFICIENT
One small placebo-controlled trial, in dogs also taking an antihistamine, found lower lesion scores with vitamin E. Our rating rules require at least two such trials, or one plus a supportive systematic review, to rate an ingredient supportive; vitamin E has one. It is the most promising of the minor skin ingredients we reviewed, and a second trial could change the rating.
When to see a veterinarian
Persistent itching, recurrent ear infections, paw licking, hair loss or red, crusty or smelly skin need a diagnosis. Allergies, parasites and infections all have effective treatments; vitamin E is at most an add-on.
Related Dog Supplement Facts content
- Fish Oil vs Allergy-Support Chews for Dogs
- Quercetin for Dogs With Allergies
- Dog Skin & Coat: What Matters
- Best-selling dog skin & coat supplements vs the evidence
In our comparison: products that list vitamin E
103 of the 285 dog skin & coat products we compared list vitamin E (36%). 4 of them are among the 20 most popular products, and their median popularity rank is #140 of 247 ranked products. Our ingredient-level evidence rating for vitamin E: insufficient.
Product-level ratings, which look at the whole formula: 103 mixed.
Most popular of these:
- #2Vetnique Glandex for Dogs Anal Gland Chews 60ct Pumpkin + Digestive Enzymes — Mixed
- #7Zesty Paws Dog Vitamins - Dog Multivitamin Chews, Chicken, 90 Ct — Mixed
- #15Salmon Oil for Dogs - Premium Fish Oil for Skin and Coat Health - Omega 3 Supplement - Supports Itchy Skin - 8 oz Liquid - Norwegian Dog Salmon Oil - Essential Dog Supplement — Mixed
- #17Zesty Paws Dog Multivitamin + Glucosamine for Dogs - Peanut Butter, 90 Ct — Mixed
- #2110-in-1 Dog Multivitamin Supplement with Glucosamine & Probiotics - Hip & Joint Support, Digestive Health, Immune Support, Heart & Skin - All-in-One Daily Vitamins & Omega-3s for Dogs, Chicken, 90 Ct — Mixed
See all 103 in the comparison table →Best sellers vs the evidence
Popularity is a relative rank within our comparison (purchases, review volume and star rating), not Amazon's Best Sellers Rank and not a measure of effectiveness. Listing data collected September 2026.
Frequently asked questions
Does vitamin E help dogs with itchy skin?
There is one encouraging trial. In 29 dogs with atopic dermatitis that were all taking an antihistamine, those given vitamin E (8.1 IU/kg a day) for eight weeks had lower skin-lesion scores than those given placebo. One small trial is not enough to call it proven, and we could not confirm a difference in itch.
Does vitamin E make a dog's coat shinier?
We found no controlled trial of vitamin E for coat quality in healthy dogs. Complete dog foods already contain vitamin E, and deficiency is rare in dogs eating them.
How much vitamin E can I give my dog?
The atopic dermatitis trial used 8.1 IU per kg of body weight once a day — about 80 IU for a 10 kg dog or 240 IU for a 30 kg dog. Vitamin E is fat-soluble, so ask your veterinarian before giving high doses long term, especially if your dog takes blood thinners.
Why do so many fish oil supplements list vitamin E?
Fish oil oxidizes easily, and vitamin E (often as mixed tocopherols) is added as an antioxidant to protect it. In those products the amount is usually small and is not intended as a skin treatment.
Does vitamin E help dogs with arthritis?
A 2023 randomized, placebo-controlled trial in 57 dogs with osteoarthritis found that vitamin E did not improve pain, lameness or quality of life.
References
- Plevnik Kapun A, et al. Vitamin E supplementation in canine atopic dermatitis: improvement of clinical signs and effects on oxidative stress markers. Vet Rec. 2014;175(22). PMID: 25205675. doi:10.1136/vr.102547
- Plevnik Kapun A, et al. Plasma and skin vitamin E concentrations in canine atopic dermatitis. Vet Q. 2013. PMID: 23323961. https://pubmed.ncbi.nlm.nih.gov/23323961/
- Gordon K, et al. A blinded, placebo-controlled study on the clinical effects of vitamin E supplementation in dogs with osteoarthritis. J Vet Intern Med. 2023;37(5):1839–1847. doi:10.1111/jvim.16816
- Olivry T, et al. Treatment of canine atopic dermatitis: 2015 updated guidelines from the International Committee on Allergic Diseases of Animals (ICADA). BMC Vet Res. 2015;11:210. doi:10.1186/s12917-015-0514-6