10 Best Fish Oil Supplements for Cats in 2021 – Reviews & Top Picks


Fish oil is known to treat many different problems in felines. For instance, fish oil has been shown to reduce inflammation, and

it may also help with skin and coat health. Some vets recommend it for arthritis because it reduces inflammation.

No matter why you’re looking to supplement your cat’s meals with fish oil, there are many different options on the market. Preferably, you want a pure supplement that works.

Read our reviews for information about the 10 best fish oil supplements available on the market.

divider-catA Quick Comparison of Our Favorites

The 10 Best Fish Oil Supplements for Cats

1. PetHonesty Omega-3 Fish Oil Supplement — Best Overall

PetHonesty Omega-3 Fish Oil Supplement (1)

The PetHonesty Omega-3 Fish Oil Supplement is the best fish oil supplement for cats on the market. It is made using the oil of sardines, mackerel, anchovies, and herring, which are all caught off the coastal waters of Iceland. This fish oil contains both DHA and EPA, which are essential components of the benefits that often come with fish oil.

All the fish that this brand includes are low in mercury. Too much mercury can be a serious problem for many cats. Furthermore, this supplement is completely free from hormones and chemicals. It is tested for potency and purity.

This supplement is bottled in a GMP-certified facility. It is then also purified to reduce the fishy smell and taste.

Pros

  • Contains both DHA and EPA
  • Low in mercury
  • Bottled in a GMP-certified facility
  • Purified to remove fish smell
  • Free from hormones and chemicals

Cons

  • Pump doesn’t always work

2. GNC Pets Ultra Mega Wild Salmon Oil Cat Supplement — Best Value

GNC Pets Ultra Mega Wild Salmon Oil Cat Supplement (1)

GNC Pets Ultra Mega Wild Salmon Oil Cat Supplement is made with a variety of different natural oils, including salmon oil and sunflower oil. It is designed to provide plenty of fatty acids that your cat needs to thrive. This formula is suitable for adult cats and may even help manage shedding in some felines.

It is full of omega fatty acids, which is exactly what you’re looking for in these products. This formula also has a savory fish flavor, so if your cat likes fish, they will readily take this formula.

We highly recommend this fish oil as the best fish oil supplement for cats for the money. It is extremely inexpensive, but it still includes everything that your feline needs.

Pros

  • Inexpensive
  • Full of omega fatty acids
  • Consumed of natural oils
  • Manages shedding

Cons

  • Plant-based oils included

3. Finest for Pets Omegease Omega-Rich Fish Oil Dog & Cat Supplement — Premium Choice

Finest for Pets Omegease Omega-Rich Fish Oil Dog & Cat Supplement (1)

For those with plenty of money to spend on their felines, we recommend Finest for Pets Omegease Omega-Rich Fish Oil Dog & Cat Supplement. It’s perfect for cats with itchy skin or shedding problems, as that’s exactly what this supplement is designed for.

This supplement easily mixes with food and doesn’t have much of a taste. Therefore, you should be able to sneak it into your cat’s meals without a problem.

This supplement is made with only fish oil, which is why it is so highly recommended. There are no filler oils in this supplement, unlike many others out there. Plus, it is made with low-mercury fish, like herring and mackerel.

Pros

  • Made with only fish oil
  • May help with shedding problems
  • Easily mixes with food
  • No strong taste
  • Made with low-mercury fish

4. American Journey Wild Alaskan Salmon Oil Formula

American Journey Wild Alaskan Salmon Oil Formula (1)

American Journey is a popular dog food company, but it makes various other products. The American Journey Wild Alaskan Salmon Oil Formula is one of them. This blend is made from both Alaskan salmon and pollock. Both sources are great sources for omega fatty acids. Therefore, this formula is ideal for supporting your cat’s skin and coat health.

With both DHA and EPA, this formula can improve your cat’s brain and vision.

The flavoring is not removed, which means that this formula will taste fishy. For many cats, this is a benefit. However, some cats don’t like this flavor.

This bottle also comes with a drip-free cap in a convenient design that makes it easy to add to your cat’s food.

Pros

  • Contains both DHA and EPA
  • Includes two sources of omega fatty acids
  • Drip-free cap
  • Flavoring is not removed

Cons

  • Tastes a bit fishy
  • Strong smell

5. Zesty Paws Core Elements Supplement

Zesty Paws Core Elements Supplement (1)

Like most other formulas, Zesty Paws Core Elements Supplement is high in both EPA and DHA. These omega fatty acids are necessary for the health of your cat’s skin and coat, so it is essential that they are included in this supplement.

This formula is completely sourced from Alaska, which contributes somewhat to the high price. That said, just because it is from Alaska, that doesn’t mean the fish used are high-quality. We don’t have much information on exactly which fish are used.

The taste and smell are removed from this formula through a purification process. Therefore, it should allow you to sneak it into your cat’s food, even if they don’t like fish flavors.

All you need to do is add 1 teaspoon of this liquid to your pet’s meal, which should be enough to benefit your cat.

Pros

  • Sourced from Alaska
  • Purified
  • Teaspoon dosage
  • Contains EPA and DHA

Cons

  • Smells bad (despite being purified)
  • Expensive

6. Animal Essentials Ocean Supreme Fish Oil Cat Supplement

Animal Essentials Ocean Supreme Fish Oil Cat Supplement (1)

The Animal Essentials Ocean Supreme Fish Oil Cat Supplement is created with fish from Iceland, the location of some of the cleanest and most sustainable fisheries in the world. This fish oil is incredibly high-quality for this reason. However, you’ll have to pay a high price for sustainability. This product is much more expensive than most other options on the market.

This formula contains no artificial preservatives, colorings, or flavorings. It is completely all-natural and fortified with vitamin E. You must refrigerate it after opening — that’s how natural it is.

That said, this bottle is made out of plastic, not glass. This plastic isn’t necessarily BPA-free.

Pros

  • No artificial preservatives
  • Fortified with vitamin E
  • Made from clean fish oil

Cons

  • Comes in a plastic bottle
  • Expensive

7. Vetoquinol Flexadin Advanced with UCII

Vetoquinol Flexadin Advanced with UCII (1)

The Vetoquinol Flexadin Advanced with UCII is full of omega fatty acids, though it is for joint health in particular. Vitamin E is also included, which can improve the health of your cat’s skin and coat. There’s a type of collagen that may also help improve joint support.

These chews are quite palatable. Many users reported that their cats ate them perfectly fine, while others reported that they didn’t. That said, it depends on your cat’s preferences.

There are a few low-quality ingredients in this formula. For instance, canola oil is included.

Pros

  • Palatable and tasty
  • Vitamin E included
  • High in omega fatty acids

Cons

  • Low-quality ingredients
  • Includes canola oil
  • Expensive

8. Nutramax Cosequin Soft Chews Joint Supplement for Cats

Nutramax Cosequin Soft Chews Joint Supplement for Cats (1)

The Nutramax Cosequin Soft Chews Joint Supplement for Cats is a solid option for most felines. It is specifically designed to be a joint supplement, so it is high in various joint-supporting ingredients, like glucosamine, manganese, and chondroitin. These may all improve your cat’s joint health.

This formula is made in the U.S.A. It is supposed to be tasty and chewable, according to the advertisement. Many users also reported that their cats ate them just fine. However, other users stated that their feline did not want to eat them.

This formula is not that soft, so some cats had trouble eating them.

Pros

  • Glucosamine and other joint-supporting ingredients included
  • Made in the U.S.A.
  • Chewable

Cons

  • Hard to get some cats to eat
  • Hard
  • Not just omega fatty acids

9. Nordic Naturals Omega-3 Pet Liquid Supplement

Nordic Naturals Omega-3 Pet Liquid Supplement (1)

The Nordic Naturals Omega-3 Pet Liquid Supplement is full of omega fatty acids, as the name suggests. It is derived solely from low-mercury fish, making it one of the better options on the market.

Furthermore, this supplement is purified to remove any impurities. It is also third-party tested, so you can rest assured that it is truly pure.

This formula is completely liquid, so it is quite easy to mix into your cat’s food. It doesn’t have a strong flavor, so most cats will eat it without much of an issue. However, there are some reports of cats disliking it.

The dropper on this formula is sometimes low-quality and doesn’t work as expected. For the price of this product, this is disappointing.

Pros

  • Purities
  • Low-mercury
  • Third-party tested

Cons

  • Poor dropper
  • Disliked by some cats
  • Some reports of sickness

10. Vital Pet Life Wild Alaskan Salmon Oil Supplement

Vital Pet Life Wild Alaskan Salmon Oil Supplement (1)

The Vital Pet Life Wild Alaskan Salmon Oil Supplement is full of omega fatty acids. It derives these from salmon oil, so it is low in mercury. The omega fatty acids may also help improve your pet’s immune system.

This formula is specifically designed to reduce itching and shedding.

However, this formula doesn’t contain any other supplements. So, it is just omega fatty acids. This may be good or bad, depending on what you’re looking for. This formula is made in the U.S.A., so you can expect it to be developed according to high safety standards.

Pros

  • Only omega fatty acids
  • Made in the U.S.A.

Cons

  • Doesn’t appear to be as effective as some other options
  • Not that yummy

Buyer’s Guide

Omega fatty acids such as EPA and DHA can be helpful for many different situations. They are often recommended for cats with joint problems, such as older cats and those with pre-existing joint issues. Supplements may also be used for felines with skin and coat issues. For instance, if your cat has skin allergies, omega fatty acid supplements can be helpful.

However, these supplements are not all made the same. To help you choose the best option for your feline, we developed the following guide.

cat taking CBD oil
Image Credit: Erin Stone, Pixabay

Purity

If you’re looking for omega fatty acids to give to your cat, you should first ensure that the supplement that you purchase actually contains omega fatty acids. Otherwise, they may include other impurities. While these impurities may not be harmful, they do water down the formula, which may cause it not to work as well.

Therefore, a purified formula is essential. It also helps if it is third-party tested. You can’t always trust the purity standards set by the company. However, you can trust reports by third-party individuals.

Simply put, you want the purest product possible.

Other Additives

In some cases, the formula may include other ingredients. For instance, some joint-supporting supplements include ingredients that may also support joint health, such as glucosamine.

If you want an overall supplement to help your feline, this is often quite useful. However, if you’re just looking for omega fatty acids, this is not the best option. Therefore, you should ensure that you’re getting pure omega fatty acids, not a supplement containing something else.

Source of Omega Fatty Acids

Preferably, you should be able to find a supplement with actual fish oil. Fish oil contains both EPA and DHA in ratios that are suitable for cats. It is high in omega-3s, not omega-6s, so it is generally healthier than some other options out there.

However, many supplements contain other oils to “support” the fish oil. These are often low-quality and not nearly as helpful. For instance, the formula may be diluted with canola oil and similar oils.

These oils do contain omega fatty acids. However, they do not include as much EPA and DHA as fish oil and often contain more omega-6 fatty acids instead.

Basically, don’t pay top price for fish oil that is diluted with other oils.

giving cat cbd oil
Image Credit: New Africa, Shutterstock

Mercury Levels

You should try to check the mercury levels in fish oil supplements. If the fish oil is made with a mercury-high fish, the supplement will contain concentrated forms of mercury. Mercury in high amounts can cause serious problems for cats, so be cautious.

There is no agency that monitors the mercury content in fish oil. So, because it is on the market, that doesn’t mean it is safe.

Therefore, look for oils that are made with low-mercury fish. Herrings, sardines, and other fish are common.

divider-catConclusion

There are many quality omega fatty acids supplements on the market. However, we liked the PetHonesty Omega-3 Fish Oil Supplement the most. It is made with pure omega fatty acids and isn’t that expensive, unlike some other options.

However, if you’re on a budget, GNC Pets Ultra Mega Wild Salmon Oil Cat Supplement is another option. It is a bit less expensive than most other products on the market, but it is still quite high-quality.

Any of the omega fatty acids supplements in our reviews list can be a great choice for your feline, though. We hope that our explanations of each product have helped you figure out the best supplement for your feline.


Featured Image Credit: Erin_Hinterland, Pixabay

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