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10 Best Lysine Supplements For Cats

Did you know that lysine can help humans and other mammals, including domesticated dogs, enhance their immune systems?

Many cats have health difficulties and low immunity, so vitamins are an excellent thing to consider if your cat isn't feeling well.

We took the liberty of compiling ten unbiased cat lysine product reviews.

We believe we have discovered a product to meet every feline demand, from liquid to chews to powder. Examine these best lysine supplements for cats to choose which is ideal for your kitty companion.

While lysine can help enhance immunity, BestForPets (bestforpets.org) always recommends consulting with your veterinarian before adding any supplements to your cat's diet.


Best Overall: VetriScience Laboratories Vetri Lysine Plus

VetriScience Laboratories Vetri Lysine Plus was our overall favorite lysine product for cats. It benefits the immune system, eyesight, and respiratory system. You can keep your feline healthy by protecting them and strengthening their bodies.

These supplements are available in 120 chicken-flavored fish-shaped chews. Kitties appear to appreciate the flavor, thus they will be a convenient daily treat for your cats.

Not only does it contain L-lysine for immunity, but it also contains DMG for hormone and antibody support. These amino acids aid in tissue repair, collagen formation, and enzymatic processes that are vital in the immune system.

This recipe is suitable for multi-cat families of any age, from kittens to elderly. We believe you will like this product because it covers the demands of practically all home cats.

However, due to dietary requirements, it will not work for every cat, so make sure to verify all ingredients.


  • DMG was added.
  • Helps with antibody production
  • Aids enzymatic functions
  • Formula for kittens, adults, and senior cats.


  • Some substances may not be suitable for all cats.


Best Price for Duralactin Feline L-lysine Cat Supplement

Consider Duralactin Feline L-lysine Cat Supplement for cats if you wish to save money while still providing overall immunity support for your cat. It’s the most affordable lysine supplement for cats.

This supplement comes in the shape of a liquid syringe. It includes easy-to-read measures on the side to help you acquire the right amount for each application. Simply mix this liquid into your cat’s or kitten’s daily food.

It focuses on immunological support with a few other benefits. In addition to immune support, this supplement contains omega fatty acids, which nourish your cat’s skin and coat.

For the price, we believe this is an excellent product for all stages of life. Of course, some picky cats may object to this new addition to their usual diet.

Also, the syringe’s seal isn’t flawless, thus there’s a potential of gradual leakage. Aside from that, it’s worth a go, especially considering the price.


  • Affordable
  • Omega-3 fatty acids have been added.
  • Servings that are easily quantifiable


  • The syringe may spill.


Vetoquinol Viralys L-lysine Oral Gel – High Quality

The Vetoquinol Viralys L-lysine Oral Gel is a little costly, but we think it’s well worth it. If you know your cat benefits from these dietary requirements, it’s a fairly good deal, as it comes in both oral gel and chews in one order.

Cats enjoy the flavor of the chicken liver chews. Both medications are intended to alleviate respiratory symptoms while also strengthening general immunity. It also lowers eye irritation, conjunctivitis, and sinus congestion.

Finally, we discovered that this treatment was very beneficial for cats who frequently sneeze and had muck in their eyes. Granted, it can significantly enhance the immunity of almost any house cat.

We discovered that this would be especially beneficial in multi-cat households where each cat favored a distinct route of consumption. Each item is handcrafted in the United States.


  • Made in the United States
  • Combination of gel and chew
  • Excellent for multi-cat households.


  • Pricey


Kittens should take Alpha Paw Cat L-Lysine Powder Supplement

If you have a kitten, the Alpha Paw Cat L-lysine Powder Supplement could be beneficial. This human-grade vitamin is ideal for kittens because it may be mixed into their usual diet without them noticing.

This product doesn’t mince words or put on extras—all it’s lysine for maximum benefit. It’s also great for fussy cats—and indoor/outdoor dwellers, so everyone wins. Because it has no flavor or odor, it is virtually undetected in meals.

This solution helps to remove a lot of the eye gunk found in kitten litters. Furthermore, it boosts their immunity, allowing them to battle these bacterial buildups more effectively.

However, if you require additional support for your cat through other additions, pure lysine may not be appropriate. You might wish to look at other options.


  • Kittens and indoor/outdoor cats
  • Lysine at its purest form
  • There is no taste and it is unnoticeable in food.


  • Pure lysine will not work in all circumstances.


L-lysine Immune Support For Cats by Strawfield Pets

Strawfield Pets L-lysine Immune Support is a powder supplement designed to minimize feline herpes symptoms and promote immunity. This recipe combines high-quality components that will benefit your cat in the long run.

This item is ideal for treating and preventing infections. It has no fillers, making it an excellent choice for cats with dietary sensitivities. It is also appropriate for cats of all ages, so it will benefit every kitty in your home.

You may easily incorporate this supplement into meals by mixing one scoop into their loaf or dry kibble. Shake or mix the meal until the formula is dissolved. Because it has a chicken flavor, it will blend in seamlessly with their current diet.

Even though this product has a meat flavor, certain cats may not be fooled. If your cat dislikes the flavor, you may need to hunt for tasteless powders.


  • Works to keep infections at bay.
  • There are no fillers in this chicken flavor.
  • Simple to incorporate into foods


  • Some cats may not like the taste.

Choosing The Right Lysine Supplement: A Buyer's Guide

Still unsure which product is best for your cat? Check out our buyer’s guide for more information on how to select the best option available.

What Exactly Is Lysine?

Lysine is an amino acid that occurs naturally in animal products. As obligate carnivores, cats require amino acids in their food to control their immunity and keep them healthy.

When their systems are unable to fight off illness, it might result in visible symptoms affecting overall wellness, respiratory health, and eye health.

Lysine acts to strengthen immunity and target areas of deficiency, allowing your cat to regain health. Even though lysine is present in almost all cat feeds, it may not be sufficient in a meal.

Including a supplement at mealtime will assist your cat in regulating.

What Other Ingredients Work Well with Lysine?

In addition to lysine supplements, several other additions can help achieve the goal. Here are some foods that go well with lysine products.

  • Dimethylglycine (DMG): DMG is an amino acid derivative that enhances the effects of lysine.
  • NAC: N-acetyl cysteine is an antioxidant that can break up mucus. It is extremely beneficial in many respiratory problems.
  • Omega Fatty Acids: Many lysine supplements contain fatty acids in order to nourish and maintain a healthy body.
  • Antioxidants: Several additional antioxidants work with lysine to boost natural immunity.

Supplemental Substances

Depending on their preferences, cats will benefit from various lysine product consistencies.

  • Chews: Chews are occasionally an excellent option for food-motivated cats. You may easily slip them a chew and they’ll believe they’re getting a tasty treat.
  • Powder is available in both flavored and flavorless varieties. Some cats enjoy the flavor-based vitamins, while others dislike the taste. It may take some trial and error to figure out which ones your cat prefers.
  • Liquid: Liquid is normally odorless and tasteless, although it can also be flavored. These supplements are usually simple to measure and incorporate into your cat’s regular diet.

Lysine’s Beneficial Effects

Lysine can benefit your cat in the following ways:

  • Immune system booster
  • Reduces feline herpes symptoms
  • Eye infection is reduced.
  • Cleanses the respiratory system
  • Promotes skin health


We still recommend VetriScience Laboratories Vetri Lysine Plus as our top selection. It comes in soft chew shape, making it suitable as a treat for cats of all ages.

They are given the correct amount of lysine, and the outcomes are really beneficial, increasing general immunity and health. If you want to save a few dollars, we also recommend Duralactin Feline L-lysine Cat Supplement.

It comes in the form of a liquid syringe, making application a snap. Simply place the appropriate dose in your kitty’s daily food dish and you’re ready to go!

Hopefully, our reviews of the best lysine supplements for cats will lead you to your most recent purchase. BestForPets (bestforpets.org) hopes your cat’s immunity improves quickly.

Author Image

Dr. Deborah Fletcher

Deborah R. Fletcher, DVM, is a skilled veterinarian with more than 15 years of experience dealing with companion and exotic animals. She has experience caring for a variety of animals, including household cats and dogs, reptiles, birds of prey, and even primates. Dr. Fletcher is a valuable part of the BestForPets team, where she contributes to their aim of providing pets and their owners with the finest possible treatment and services.

Veterinarian (DVM) Dr. Deborah Fletcher


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