Pet supplements / best of
Best fish oil for cats.
Cat omega-3 fish-oil supplements, ranked on our rubric. Omega-3 has real feline evidence for skin, coat, and joints, so the question is whether a product discloses a real EPA and DHA dose.
Omega-3 fish oil is one of the few cat supplements with evidence on its side. The long-chain omega-3s EPA and DHA have feline support for skin and coat health and for joint comfort; a 2025 controlled trial found that an EPA/DHA-elevated diet roughly halved the medication itchy cats needed. The evidence in cats is real, if thinner and more mixed than the dog data, which is why our rubric still rates omega-3 as one of the stronger-evidenced actives we score.
A good active does not make a good product. The same three things matter for cats as for dogs. Disclosure: the label should state EPA and DHA as separate milligram amounts, not bury them in a single 'total fish oil' or 'total omega-3' figure. Dose: the weight-scaled serving should reach the studied range, and small cats are easy to under-dose. Purity: because fish oil can concentrate mercury and other contaminants, third-party purity testing is a genuine plus.
This list ranks the cat fish oils in our catalog by full composite. Pump-bottle oils that never state how many servings are in the bottle are not here, because we cannot verify their cost per day. Read each scorecard for the actual EPA and DHA numbers.
6 supplements
Ranked by PetScored composite.
- Nordic Naturals Omega-3 Pet Soft Gels
The strongest-evidence omega active, fully disclosed in triglyceride form and third-party tested; a partial per-softgel dose for a larger dog keeps it just under the top.
Dogs & catsSkin & coatNASC seal8.8Strong - Zesty Paws Wild Alaskan Salmon Oil
A disclosed, well-dosed salmon and pollock omega oil, NASC-sealed and inexpensive per day; strong execution puts it near the top. The Feb 2025 Zesty Paws recall covered soft chews, not this oil.
Dogs & catsSkin & coatNASC seal8.5Strong - Grizzly Salmon Plus Wild Salmon Oil
High disclosed EPA and DHA per pump in natural triglyceride form, NASC-audited, and inexpensive per day; strong execution lands it at the top of Good.
Dogs & catsSkin & coatNASC seal8.4Good - Nordic Naturals Omega-3 Cat
A triglyceride-form fish oil third-party tested for purity and keyed to the feline skin and coat evidence; a typical cat reaches only a partial share of the studied EPA and DHA dose at the labeled serving, which keeps it Good rather than Strong.
CatsSkin & coatNASC seal7.8Good - Nutramax Welactin Feline Omega-3
A disclosed fish-oil liquid delivering an EPA and DHA dose near the feline dermatology target, keyed to the cat skin and coat evidence; well made, though the fish-oil form is not stated and the scoop count is derived.
CatsSkin & coat7.8Good - VetriScience Omega 3,6,9 Gel Caps
Discloses EPA and DHA separately in an NASC gel cap from a maker that owns its cGMP plant, but the weight-scaled label dose delivers only about 20 mg/kg/day of EPA plus DHA, below the studied skin and coat range, and there is no independent testing.
Dogs & catsSkin & coatNASC seal7.5Good
FAQ
Frequently asked
Does fish oil work for cats?
It has real feline evidence, better than most cat supplements. EPA and DHA, the omega-3s in fish oil, have support for cat skin and coat and for joints; a 2025 controlled trial found an EPA/DHA-rich diet roughly halved the medication itchy cats needed. The evidence is thinner than for dogs, and the benefit depends on an adequate dose.
How much fish oil should a cat get?
Dose is weight-based and easy to fall short of for a small cat, so the number that matters is combined EPA plus DHA, not 'total fish oil'. Check that the label discloses both, and confirm a specific dose with your veterinarian, especially for a cat with a health condition.
Is fish oil safe for cats?
Fish oil is generally well tolerated, but two cautions apply: it can concentrate mercury and other contaminants, so third-party purity testing is a real plus, and the calories and fat add up, which matters for an overweight cat. Confirm with your veterinarian before adding it to a cat's diet.
This ranking is our opinion under a published rubric, not veterinary advice. Affiliate links on individual scorecards never affect the score. See the affiliate disclosure and medical disclaimer.