For Cats

L-Lysine Liquid Drops

Support your cat’s full-body wellness from the immune system to digestion with Arfuny’s palatable L-Lysine drops, designed to make daily care simple and stress-free!

Our Immune Support is a blend of L-Lysine, natural botanicals and vitamins that:

Strengthens the immune system
Promotes normal eye health
Supports healthy respiratory function
Nourishes skin and coat wellness

Addresses Common Feline Discomforts
Many cats face recurring immune-related issues, including frequent sneezing, runny nose, squinting, watery or inflamed eyes, and seasonal respiratory discomfort. These problems can affect their daily comfort, reduce energy levels, and impact overall quality of life—making targeted, gentle support essential for long-term health.

Comprehensive Multi-Benefit Support
Our vet-formulated drops combine premium L-Lysine HCl with natural botanicals (Astragalus, Codonopsis, Atractylodes Macrocephala, Burdock Seed) and essential vitamins to deliver full-body care:
1)Strengthens the immune system to help manage common health concerns
2)Promotes healthy respiratory function and maintains normal eye health
3)Supports digestive balance and nourishes skin & coat wellness
4)Boosts vitality and overall feline well-being

Irresistible Flavor & Stress-Free Use
Infused with a delicious chicken flavor loved by even the pickiest eaters, our liquid formula eliminates the hassle of messy powders, hard capsules, or unpalatable supplements. It can be fed directly or mixed with food, water, or milk for seamless daily administration, making it perfect for cats of all ages, breeds, and sizes. The grain-free, alcohol-free, gluten-free formula with no additives ensures it’s safe for every furry friend.

Designed for daily use for cats of all ages, breeds, and sizes. Follow the label directions for the appropriate daily serving amount.

Shake well before use. Serve directly or mix with food, water, or milk as part of your cat’s regular routine. The liquid format offers a simple way to add daily L-Lysine support without powders, capsules, or hard chews.

Made with L-Lysine HCl, astragalus, codonopsis, atractylodes macrocephala, burdock seed, vitamins, and supportive ingredients. This formula is designed to help support immune health, eye health, respiratory wellness, and everyday feline well-being.

Your pet deserves simple, joyful care
We know how deeply you love your pet—and how overwhelming it can feel to navigate pet wellness. Too many products are confusing, complicated, or just don’t fit into everyday life. ARFUNY was built to change that: to make pet care feel straightforward, reliable, and full of genuine joy, not stress.

Supplements that fit your life
We believe pet wellness shouldn’t require guesswork. Every ARFUNY product is thoughtfully formulated with high-quality, pet-first ingredients, designed to be easy to understand, simple to stick with, and effective for real, everyday life. No overcomplicated jargon, no unnecessary steps—just the care your pet deserves, made simple.

Care rooted in trust and joy
At ARFUNY, we see the bond between pets and their people as something special. Our holistic approach to pet wellness combines gentle, effective ingredients with heartfelt intention, because we know that when care feels easy, it feels joyful. We prioritize transparency, thoughtful design, and consistent quality in every product, so you can trust you’re giving your pet the very best.

Made with love, backed by care
Every batch of ARFUNY products is crafted with the same love you give your pet. We take pride in creating supplements that are as reliable as they are easy to use, with quality ingredients you can feel good about. Because when pet wellness feels simple, it feels rewarding—for you, and for them.

PDhtml L-Lysine Liquid Drops

Reviews

Short proof points that reinforce trust quickly.

Representative quotes help the page feel more grounded without slowing the read.

ABOUT FUNCTIONALITY
Helps with recurring cat cold issues

“My cat often gets sneezy and watery eyes when seasons change. Thankfully this lysine works great. Those annoying symptoms fade away gradually, and it really keeps herpes from flaring up again.”

★★★★★
ABOUT EYE HEALTH
Noticeable improvement on immunity

“My kitty used to fall sick easily. I stick to feeding it daily, and now it feels way healthier and more lively. It barely gets unwell these days.”

★★★★★
ABOUT TASTE
Great all-around care for cats

“It does more than just protecting breathing health. My cat grows steadily with firmer body condition, and its coat also turns softer and shinier than before.”

★★★★★
ABOUT PRODUCT
Cats love the taste super much

“The chicken flavor hits my cat’s taste perfectly. No trouble getting it to eat at all. Easy to absorb and safe enough for long term daily feeding.”

★★★★★
TRUSTED DAILY SUPPORT

Chosen by Cat Parents for Daily Immune Support

Key Ingredients

Clean, effective, high quality ingredients
For your cat

ARFUNY L-Lysine drops are designed for everyday feline wellness, combining immune support, respiratory comfort, and an easy liquid routine cats can enjoy.

L-Lysine HCl

L-Lysine HCl

Supports immune function and eye health, promoting strong daily wellness for cats of every age.

Function
Helps support immune function and eye health for everyday wellness.

Astragalus

Astragalus

A traditional botanical that helps support immune balance and the body's natural defenses.

Function
Helps support immune balance and natural defenses for everyday wellness.

Codonopsis

Codonopsis

Supports natural resilience and helps maintain steady energy and vitality.

Function
Helps support natural resilience and steady vitality for everyday wellness.

Burdock Seed

Burdock Seed

A time-honored herbal ingredient that supports general wellbeing and a healthy coat.

Function
Helps support general wellbeing and a healthy coat for everyday wellness.

Atractylodes Macrocephala

Atractylodes Macrocephala

Supports digestive comfort and helps maintain balanced energy and vitality.

Function
Helps support digestive comfort and balanced vitality for everyday wellness.

Vitamins

Vitamins

Essential vitamins that support metabolic functions and overall feline health.

Function
Helps support essential metabolic functions for everyday wellness.
TRUSTED DAILY SUPPORT

Chosen by Cat Parents for Daily Immune Support

A simple daily L-Lysine liquid formula made to support your cat's immune, respiratory, eye, skin & coat, and overall wellness routine.

ARFUNY L-Lysine drops are designed for everyday feline wellness, combining immune support, respiratory comfort, and an easy liquid routine cats can enjoy.

100,000+Cat Customers
95%+Positive Reviews
5-StarLoved by Pet Parents
L-Lysine Liquid Drops trust overview
How to feed step 1
How to feed step 2
Why Pet Parents Choose

ARFUNY

Cat-focused daily support with a clean liquid formula made for easy routines.

Powder

Practical when meal mixing is already expected.

  • - Visible in food for picky eaters
  • - Depends on meal compliance
  • + Works for easy food mixing

Paste / Treat

Helpful for some formats, but less aligned in others.

  • - More format-specific
  • - Can feel messier depending on use
  • + Still usable in focused routines
Why choose comparison 1 Why choose comparison 2 Why choose comparison 3 Why choose comparison 4
Feature
ARFUNY
Others
Formulated and developed for cats
Liquid formula for fast absorption
No fillers, grain, dairy, or artificial flavors
Supports immune & respiratory health
Clean ingredient labels
Picky eater approved
No-mess liquid format, easy to administer
FAQ

frequently asked questions

Practical answers help the product feel easier to trust and easier to buy.

Our L-lysine drops are specially formulated to support your cat's overall well-being. L-Lysine HCl strengthens the immune system to help manage common feline issues like sneezing, runny nose, squinting, and watery/inflamed eyes, while also promoting normal eye function and respiratory health. The blend of natural ingredients and vitamins works synergistically to boost vitality and long-term health.
Unlike messy powders, hard-to-chew tablets, or capsules, our liquid formula is easy to administer. It features a palatable chicken flavor that appeals to picky eaters, plus a comprehensive blend of natural ingredients (Astragalus, Codonopsis, Atractylodes, Burdock Seed) that support immunity, vitality, digestion, and skin/coat health all in one supplement. It is also free from grains, gluten, alcohol, additives, and harmful chemicals.
The liquid drops are extremely versatile. They can be fed directly to your cat, or mixed with food, water, or milk. Please refer to the product label for dosage instructions based on your cat's weight and age, as this will vary.
Our formula is suitable for cats of any age, breed, and size, including kittens, adults, and senior cats.
Yes, it is made with safe, natural ingredients free from grains, alcohol, gluten, additives, and harmful chemicals. Key components include L-Lysine HCl, Astragalus, Codonopsis, Atractylodes Macrocephala, Burdock Seed, and a blend of essential vitamins.
Yes! It is made with a delicious chicken flavor that most cats love, making it easy to administer even to the pickiest eaters.
Yes. The primary purpose of the L-lysine formula is to support the immune system, which helps manage common feline issues such as sneezing, runny nose, squinting, and watery, inflamed eyes. It also promotes normal respiratory and eye health.
The formula uses gentle, natural ingredients and is generally well-tolerated. As with any new supplement, if your cat experiences unusual digestive upset or allergic reactions, discontinue use and consult your veterinarian.
Absolutely! One of the main benefits of the liquid formula is its versatility. It can be used directly or mixed with your cat's food, water, or milk for easy administration.
No. Our L-lysine drops are free from grains, alcohol, gluten, additives, and harmful chemicals, making them suitable for cats with sensitivities to these ingredients.
Yes. The formula includes Burdock Seed, which is specifically added to nourish the skin and coat, supporting overall skin health alongside immune function.
While the ingredients are generally safe, we always recommend consulting with your veterinarian before introducing any new supplement to your cat's routine, especially if they are on other medications or have pre-existing health conditions.
For optimal potency and freshness, we recommend storing the drops in a cool, dry place, away from direct sunlight. Refrigeration is not required, but check the label for the exact expiration date and storage guidelines once the bottle is opened.
  • 5 stars: 55 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
J
John Smith
Great Product!

This review body has a comma in it, so it is wrapped in quotes to avoid messing up the CSV.

This is a reply by the admin

G
Gee Steucy
Effectiveness

I was skeptical at first... three dosages in, my Thommy boi is doing so much better...he'd been really congested, lethargic...today he chased his sister for the 1at time in 3weeks.... she's none too happy but I'm over the moon... It really, really does work everyone ??

L
LC
Great Product!

These drops are amazing. My cat suffers with seasonal allergies in the summer and it really affects his mood, he used to get gunky eyes etc. Using L - Lysine fixed all these, I can have windows open all day and all night, it doesn't affect him anymore. He is a very fussy eater but he's obsessed with the flavour. He begs for these every morning. Only downside is that due to his size, bottle only lasts a month so works out pretty expensive.

A
Amber E
Helped My Cat Heal Without Surgery

My senior cat had been dealing with persistent eye issues for months due to feline herpes. The problem became so severe that we were referred to a specialist who recommended eye removal. Facing a potential $3,000 to $5,000 surgery, I decided to first explore ways to better support her immune system.

This was the first supplement I introduced so I could clearly monitor any side effects. I continued using the eye drops prescribed by her primary vet and added just one drop of this product to her wet food each day.
Within two weeks, her eye had completely healed.
She is an extremely picky eater and usually refuses anything new, but she did not mind this at all when mixed into her wet food. I am so grateful I found this product because it truly seemed to support her body's ability to heal and helped us avoid a major surgery.

I would recommend this to other pet parents dealing with similar issues.

B
Brabdi Bishop
This stuff is AWSOME!

Cats love the flavor and we have no issues with them refusing it. It seems to be helping with the kittens that have FHV and the eye drainage, sneezing has gotten better.
Wish the dropper were better. It does not fill to the top line, only halfway, which is not a big deal but it doubles the time it takes when giving to a large amount of cats. That's the only drawback. I'll still be ordering more of this soon though, good product!

A
Arden E Folsom
Miraculously effective!

My cat loves this product. She goes to the cabinet I keep it in and begs for it several times a day.... it's like she's addicted to it. I only give it to her twice daily however. Usually it's on her food, but lately she's started licking it right from the dropper as I try to put it on her food. It really has helped with her sinus issues. I've noticed that she's not sneezing hardly at all since we started it and her eyes are less runny. She's been on it about 3 months now. Price isn't bad especially when compared to going to the vet for a visit and meds.

A
Anna
Tasty product

I am a SKEPTIC. But my poor kitty has FIV and had an attack of the immune system. It started destroying her red blood cells and her bone marrow platelets TANKED. She was close to death. We brought her home and I had already bought this. She's on an antibiotic and a steroid. They gave us Elura (appetite stimulant) did not work. She didn't eat. I swear I gave her this, she took a nap then awoke like a sleeper agent looking for food. I can't credit this for everything because like I said she's on antibiotics and steroids but I give it to her twice a day and she's eating, no sneezing, and she has an appetite. She still might not make it but I 100% know this has given us more time with her and made her comfortable. I am very happy with this product and am on my second bottle.

M
Mchan
A Definite Must!! Highly Recommend!

I'm so glad this L-Lysine dropper exists!! Before, I were finger-feeding a few kittens that wouldn't eat on their own from URI with a gel form of L-Lysine alongside another supplement with food. Ever since they reached the point of being able to eat by themselves again, I'd been adding this to their kibble and wet food and wow, it really helped! One kitten, who had her eyes tightly shut for weeks when given the gel and nutritional supplement, had them slightly open the next day after eating kibble with this product mixed in, and by the following day, her eyes were so wide I almost didn't recognize her! Since I've began using this, affected kittens who previously seemed to have difficulty relearning to eat the kibble solo, are showing a normal appetite again and have full, protruding bellies like they used to!!
Oddly, some have shown signs of regression where their eyes could be very clear and bright one day, then one would be closed or watery again the next. The more I continue to give them food with this liquid, the healthier their appetites seem. They are showing signs of energy, and alertness, compared to how sluggish they were before.
The contents of the bottle definitely seem more broth-like than anything else. My only gripe is the dropper usually gives .75 rather than the full amount, each squeeze. But, on the bright side, their suggested dosage is great when feeding a colony who all benefit from it!

W
Wins
Vitamins for cats!

We had a couple cats in our home who came down with a cold. While prescribed antibiotics from the Vet took care of infection type stuff, they were still left with breathing and congestion issues which minimized their appetites and still kept them drastically under the weather. Upon doing some research as to how to help them, I came across this L-Lysine Supplement and overnighted it to our home. After taking 3 to 4 doses of this, all of my babies were back to their normal, playful selves. Their appetites returned and their congestion, eyes, and noses also cleared right up. They also collectively LOVED the taste (and we have some extremely picky eaters) making it so easy to administer as they all just believed it was a treat. The strong smell was also a benefit as that is recommended for their appetite to return making them want it even when their respiratory function is hindered making some smells hard for them. I would definitely recommend this product to anyone who wants their babies health and respiratory issues cleared.

S
Scoobie
Great Product!

This product has been a game changer for my Persian. Before she would wake up with her eyes, crusted shut and be wheezy all day long. One dropper of this every night has totally cleared her up! No more goopy eyes, they are totally clear 24 seven. We still get an occasional sneeze/wheeze but that's true of any cat. I cannot tell you the difference this has made. And Mabel loves the flavor of this! She would drink the entire bottle if I left it out! Please give it a try I think you'll will be pleased. It has made our Persian's life so much more comfortable. The first picture is after having used the drops for a couple of weeks and the second picture is before. You can see how she can hardly get her eyelids open. But after her eyes are as clear as can be.

P
Praseeda
sinuses cleared up, food tastes better

I put it on my cats meals once a day at and they'll love it because it taste like chicken and and they just eat it all up it's a good product at a good value for money

J
John Smith
Great Product!

This review body has a comma in it, so it is wrapped in quotes to avoid messing up the CSV.

This is a reply by the admin

L
Linnybug
Wow! Finally, a supplement that did the trick!

My cat had a serious sinus infection from multiple issues including infected top fangs and 5 other bad teeth removed from my 13 year old kitty. She also had underlying allergies and a weaker immune system than my other cats, likely due to her being a feral cat that probably came from other feral cats that weren't properly nurished. After three rounds of antibiotic, two long acting steroid injections, and eight extractions plus a sinus flush, I had my work cut out for me at home to provide a full recovery. I did my own research and found this product which I used along with a nebulizer and she improved significantly. She is almost back to her normal weight, sleeping and breathing comfortably with a great appetite. It is always important to see the vet for necessary treatment but what we do at home to help our pets is crucial and goes a long way in recovery, particularly from a bad sinus infection. I highly recommend this L Lysine supplement provided daily and which I have also started my other cats seeing the results with my sick cat, who is breathing better, sleeping better, and pretty much turned the corner after adding this supplement to her daily regimen.

E
Eva
Works great

Super wirkung

G
Grace
cat approved

my cat comes running whenever i start tapping on the bottle, i thought it was gonna be a fight to give this to her everyday but she loves it!

A
Amber E
Helped My Cat Heal Without Surgery

My senior cat had been dealing with persistent eye issues for months due to feline herpes. The problem became so severe that we were referred to a specialist who recommended eye removal. Facing a potential $3,000 to $5,000 surgery, I decided to first explore ways to better support her immune system.

This was the first supplement I introduced so I could clearly monitor any side effects. I continued using the eye drops prescribed by her primary vet and added just one drop of this product to her wet food each day.
Within two weeks, her eye had completely healed.
She is an extremely picky eater and usually refuses anything new, but she did not mind this at all when mixed into her wet food. I am so grateful I found this product because it truly seemed to support her body's ability to heal and helped us avoid a major surgery.

I would recommend this to other pet parents dealing with similar issues.

A
Arden E Folsom
Miraculously effective!

My cat loves this product. She goes to the cabinet I keep it in and begs for it several times a day.... it's like she's addicted to it. I only give it to her twice daily however. Usually it's on her food, but lately she's started licking it right from the dropper as I try to put it on her food. It really has helped with her sinus issues. I've noticed that she's not sneezing hardly at all since we started it and her eyes are less runny. She's been on it about 3 months now. Price isn't bad especially when compared to going to the vet for a visit and meds.

A
Andrea
Great Product!

Is it a miracle? Time will tell but after less than 24 hours, my British Shorthair who has had runny eyes for nearly 9 years is sitting in the window right now with dry eyes ??. He also recently, over the last 2 years, starting sneezing during springtime. I didn't know cats get allergies, but putting two and two together, it must be that. Anyway, I have not heard one sneeze from him since I gave him his first dose. He's a big boy (18lb) so I gave him 2 droppers full in his wet food. He's picky, he would not lick it up directly from the dropper. I will update this review if anything changes but for now, I am completely astonished at how effective this supplement is. In fact, I feel bad I didn't do this sooner. We'll see if his coat improves and/or his energy. So far, great product and I highly recommend giving it a shot to treat leaky eyes.

S
Stephanie
Two out of three cats recommend

Two of my three felines will ask for this straight from the dropper. The other one requires a football hold. Purchased the lysine because two of the three have issues with the eyes and the vet had recommended this supplement. The liquid supplement has been the best option for mine versus treats. You just have to find which one your cats prefer.

A
Amazon Customer
This product works!

My cat was so sick, could not walk. I was going to have to euthanize him. He's only one year old, I was so sad. Tried this product and I am amazed how well he has recovered. L-Lysine by ARFUNY worked a miracle!

L
LC
Great Product!

These drops are amazing. My cat suffers with seasonal allergies in the summer and it really affects his mood, he used to get gunky eyes etc. Using L - Lysine fixed all these, I can have windows open all day and all night, it doesn't affect him anymore. He is a very fussy eater but he's obsessed with the flavour. He begs for these every morning. Only downside is that due to his size, bottle only lasts a month so works out pretty expensive.

T
Tiffany Wright
The cats are addicted to it, and it's helping with FHV symptoms!

We rescued a stray cat approximately 9-mo ago that was living on our property (long before we moved in). When we took him in he was extremely frail and emaciated, with very little energy, and he was runny, sneezy and wheezy.

SHORT STORY (if you just want to get to the point): We��ve recently begun using this L-Lysine product and it��s definitely helping (along with daily Albuterol nebulizer treatments). I definitely recommend it. He also enjoys the flavor (thank goodness). The only negative is that it can get messy, as it drips off the glass dropper - so - bring a paper towel with you!

LONG STORY (if you��re curious): For context, when we moved into our temporary rental while buying a home 13-mo ago there were approximately 15 stray cats on the Lot and we installed gravity feeders, automatic water bowls, and temperature controlled cat houses on the side of the home for them. They were all VERY friendly and took to us quickly, even responding to the names we gave them, over time. We worked with a local nonprofit to get them TNR��d, as well as their much needed vaccines. For the most part, they were just hungry. But they gained weight quickly once they started being fed regularly and had a safe/comfortable place to eat and sleep.

Anyway, back to the one we took in�� he was NOT gaining weight and his energy was fading, fast. One night we came home from a dinner out and noticed that he couldn��t walk across the driveway to say hi to us, which meant he was likely not walking to the food/water, either. When I went to his self-proclaimed sleeping spot he was purring loudly and rubbing his head in my hands, but it was obvious that he was giving me every ounce of energy he had. His breathing was labored, and nose running profusely. He was one of the few cats that already had an ��ear tip�� (meaning he was TNR��d before we became involved), which meant the nonprofit wouldn��t typically get involved, but luckily we are good friends with the woman who runs it so we immediately called her (at 9 p.m., as they do their nonprofit TNR��s at a local shelter through the night when the facility is closed) and she told us to bring him right away. We put him in the carrier, which he didn��t even protest to, and drove him over and left him there for the night. Their vet was able to determine that he had a SEVERE URI (Upper Respiratory Infection), and was SEVERELY DEHYDRATED (he went through 3x the amount of fluids a typical stray would receive). We also opted for the SNAP Test and were told that he DOES, in fact, have FIV. They gave him a heftily dosed antibiotic shot and let us take him home the following morning.

There was NO WAY I was putting him back outside in that state. We quarantined him inside our home (we had 3 of our own personal indoor cats and URI��s are extremely contagious), and for 3-WEEKS he barely wanted to leave his sleep space. He slept like he had never had a true peaceful moment of sleep in his life! He was so grateful and loving. He also doubled his weight in that short period of time. We realized almost immediately that he was now a part of the family.

Unfortunately, the URI didn��t seem to fully clear so the vet gave him an oral round of antibiotics. He got ��better�� but within days of finishing the prescription his running nose, sneezing, runny eyes and asthma attacks would return. Fast forward to 9-mo later and he has (unfortunately) been through 5 rounds of different antibiotics. All had the same result: good then back to sick almost immediately. He��s also been to the vet (not the nonprofit) 4 times, which is pricey (but worth it for his comfort). We��re now waiting on the lab test to come back on his nasal swab - as they have been treating him as bacterial, but, given that he is FIV+, it��s likely viral. Anti-virals are expensive and since we did the SNAP test without proper education prior to attaining pet insurance, it��s considered a ��pre-existing condition�� so it��s not covered.

In the interim, we��ve recently begun using this L-Lysine product and it��s definitely helping (along with daily Albuterol nebulizer treatments). I definitely recommend it. It helps to keep the runny, sneezy, wheezy stuff at bay. If it has been working well for him, it should certainly help others, too. The product is more like a broth, than a syrup, and it is made with quality ingredients.

B
Brabdi Bishop
This stuff is AWSOME!

Cats love the flavor and we have no issues with them refusing it. It seems to be helping with the kittens that have FHV and the eye drainage, sneezing has gotten better.
Wish the dropper were better. It does not fill to the top line, only halfway, which is not a big deal but it doubles the time it takes when giving to a large amount of cats. That's the only drawback. I'll still be ordering more of this soon though, good product!