--- title: "lysine for cats — Niche Verdict: Worth a look (58/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/pet-supplies/lysine-for-cats" last_updated: "2026-07-10T01:44:16.493Z" locale: en meta: description: "lysine for cats shows low returns (0.1%), but a small market ($1.4M/yr) keeps it on the watch list." "og:description": "lysine for cats shows low returns (0.1%), but a small market ($1.4M/yr) keeps it on the watch list." "og:title": "lysine for cats — Niche Verdict: Worth a look (58/100) | Amazon United States - Flapen" --- Back to Flapen home # **lysine for cats** **Worth a look****58/100 ** lysine for cats shows low returns (0.1%), but a small market ($1.4M/yr) keeps it on the watch list. **Market/yr** **$1.4M** **Growth (1y)** **+192.8%** **Products** **24** **Brands** **20** was 15 a year ago **Sellers** **34** **Price range** **$6.57–$34.50** **Returns** **0.1%** **Rating** **4.4★** **Worth a look** Scored 58/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **40** ×0.30 Growth **76** ×0.30 Competition **45** ×0.20 Quality gap **47** ×0.10 Returns **99** ×0.10 ## **Demand** Weekly Amazon search volume, last 104 weeks — +192.8% year over year. 15K7KSpike '25Prime Day '25Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26 ## **Seasonality** Monthly demand index across the year — 1.00 is average. JFMAMJJASOND No pronounced peak months · busiest ÷ quietest = 1.3× ## **Competition** - Vetoquinol27% - SANTKOL15% - Pet Honesty13% - Coco and Luna10% - Felisyl7% - NOW Foods4% - Other (14 brands)25% The top 5 products take 60% of clicks — established leaders, but buyers still shop beyond them. 20 brands and 34 sellers compete here. **Brands** **20 **▲rising was 15 a year ago **Sellers** **34** **Top 5 brand share** **71%** #ProductBrandPriceRatingReviewsClick shareTrend 1 ![Vetoquinol Viralys - Lysine Supplement for Cats & Kittens - Supports Eye Wellness Respiratory Health & Immune Strength - Flavored Oral Powder for Easy Feeding & Daily Use - 100 Grams](https://m.media-amazon.com/images/I/41hozmb4g3L.jpg) [**Vetoquinol Viralys - Lysine Supplement for Cats & Kittens - Supports Eye Wellness Respiratory Health & Immune Strength - Flavored Oral Powder for Easy Feeding & Daily Use - 100 Grams**](https://www.amazon.com/dp/B000FULBT4) Vetoquinol$30.844.6★9,57717%▼falling 2 ![SANTKOL L-Lysine Supplement for Cats - Immune Support - 60ML Lysine for Feline Respiratory Sneezing Runny Nose Eye Function - Natural Cat Antibiotic Drops - Roast Chicken Flavor](https://m.media-amazon.com/images/I/51IN3wzYjEL.jpg) [**SANTKOL L-Lysine Supplement for Cats - Immune Support - 60ML Lysine for Feline Respiratory Sneezing Runny Nose Eye Function - Natural Cat Antibiotic Drops - Roast Chicken Flavor**](https://www.amazon.com/dp/B0DFGZCD2V) SANTKOL$20.674.5★1,50313%▲rising 3 ![Cat Immune Support Lysine Allergy Relief & Immune Health Supplement for Cats with L-Lysine Colostrum Quercetin & Omega-3 Soothes Sneezing Runny Nose & Itchy Skin Chicken (30-Day Supply)](https://m.media-amazon.com/images/I/51DYQaPjwOL.jpg) [**Cat Immune Support Lysine Allergy Relief & Immune Health Supplement for Cats with L-Lysine Colostrum Quercetin & Omega-3 Soothes Sneezing Runny Nose & Itchy Skin Chicken (30-Day Supply)**](https://www.amazon.com/dp/B0C2B7F597) Pet Honesty$15.334.5★2,46111%▲rising 4 ![L-Lysine for Cats 900mg - Immune Eye & Respiratory Support Powder](https://m.media-amazon.com/images/I/41AJZ3DBrEL.jpg) [**L-Lysine for Cats 900mg - Immune Eye & Respiratory Support Powder**](https://www.amazon.com/dp/B083QR6NMT) Coco and Luna$22.494.4★3,17010%▼falling 5 ![Vetoquinol Viralys - Lysine Supplement for Cats & Kittens - Supports Eye Wellness Respiratory Health & Immune Strength - Flavored Oral Gel for Easy Feeding & Daily Use for Picky Eaters - 5oz](https://m.media-amazon.com/images/I/31LTQAqU4yL.jpg) [**Vetoquinol Viralys - Lysine Supplement for Cats & Kittens - Supports Eye Wellness Respiratory Health & Immune Strength - Flavored Oral Gel for Easy Feeding & Daily Use for Picky Eaters - 5oz**](https://www.amazon.com/dp/B00AMEBH06) Vetoquinol$24.494.5★11,2098%▼falling 6 ![Felisyl L-Lysine Gel for Cats & Kittens (5oz) Immune System Respiratory & Eye Health Support. Reduces Sneezing Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement Made in USA (1 Pack)](https://m.media-amazon.com/images/I/416hY7iNOhL.jpg) [**Felisyl L-Lysine Gel for Cats & Kittens (5oz) Immune System Respiratory & Eye Health Support. Reduces Sneezing Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement Made in USA (1 Pack)**](https://www.amazon.com/dp/B00MO9SHBE) Felisyl$18.294.4★2,2127%▼falling 7 ![NOW Pet Health L-Lysine Supplement Powder Formulated for Cats NASC Certified 8-Ounce](https://m.media-amazon.com/images/I/41GzyMpSYhL.jpg) [**NOW Pet Health L-Lysine Supplement Powder Formulated for Cats NASC Certified 8-Ounce**](https://www.amazon.com/dp/B016WG7UF8) NOW Foods$12.164.5★3,5474%▼falling 8 ![VetriScience Lysine Immunity Health Chews 250 mg Lysine Plus Immune Supplement for Cats and Kittens with Allergies Sneezing Runny Nose and Watery Eyes Chicken 120 Count](https://m.media-amazon.com/images/I/41UNAX2bMiL.jpg) [**VetriScience Lysine Immunity Health Chews 250 mg Lysine Plus Immune Supplement for Cats and Kittens with Allergies Sneezing Runny Nose and Watery Eyes Chicken 120 Count**](https://www.amazon.com/dp/B002ALE9RM) VETRISCIENCE$18.514.1★11,8714%▼falling 9 ![Guardians Choice L-Lysine for Cats Cat Lysine Powder 200 Servings](https://m.media-amazon.com/images/I/516RQoi7mEL.jpg) [**Guardians Choice L-Lysine for Cats Cat Lysine Powder 200 Servings**](https://www.amazon.com/dp/B0FDFQVJ6G) Guardian's Choice$16.584.6★2053%▼falling 10 ![Tomlyn Immune Support Daily L-Lysine Supplement Fish-Flavored Lysine Powder for Cats and Kittens 3.5oz](https://m.media-amazon.com/images/I/41JE8ntYD0L.jpg) [**Tomlyn Immune Support Daily L-Lysine Supplement Fish-Flavored Lysine Powder for Cats and Kittens 3.5oz**](https://www.amazon.com/dp/B00BERPOP4) TOMLYN$20.294.6★5,4193%▼falling 11 ![L-Lysine Chews for Cats 500 Chews Immune & Respiratory Support Crunchy Shell with Krill Core with Colostrum & Omega-3s for Sneezing and Runny Nose Chicken Flavor for All Ages & Breeds Cats](https://m.media-amazon.com/images/I/51AWo0wTMmL.jpg) [**L-Lysine Chews for Cats 500 Chews Immune & Respiratory Support Crunchy Shell with Krill Core with Colostrum & Omega-3s for Sneezing and Runny Nose Chicken Flavor for All Ages & Breeds Cats**](https://www.amazon.com/dp/B0FWQZMCTK) WEALLIN$20.824.4★2662%▲rising 12 ![Lysine for Cats 500ct Cat Immune Support Chews L-Lysine Supplement for Cats with Colostrum Omega-3 Soothes Sneezing Runny Nose & Upper Respiratory Support Crunchy & Creamy Chicken Krill Flavor](https://m.media-amazon.com/images/I/51MRG+osy5L.jpg) [**Lysine for Cats 500ct Cat Immune Support Chews L-Lysine Supplement for Cats with Colostrum Omega-3 Soothes Sneezing Runny Nose & Upper Respiratory Support Crunchy & Creamy Chicken Krill Flavor**](https://www.amazon.com/dp/B0G2XWD5HV) Carmelie$19.664.3★1272%▲rising 13 ![Lysine for Cats - 2 Packs Cat Lysine Drops - Sneezing Treatment Nasal Relief - Feline Upper Respiratory Infection Runny Nose Eye Function - Immune Support - Roast Chicken Flavor](https://m.media-amazon.com/images/I/51e1Jh0NzML.jpg) [**Lysine for Cats - 2 Packs Cat Lysine Drops - Sneezing Treatment Nasal Relief - Feline Upper Respiratory Infection Runny Nose Eye Function - Immune Support - Roast Chicken Flavor**](https://www.amazon.com/dp/B0F5Q4DNPB) SANTKOL$34.504.6★2042%▲rising 14 ![L-Lysine for Cats Cat Lysine Supplement for Immune Support Feline Respiratory Sneezing Runny Nose Eye Function Natural Strengthen Defenses Chicken Flavor 60 ML](https://m.media-amazon.com/images/I/511liK74qGL.jpg) [**L-Lysine for Cats Cat Lysine Supplement for Immune Support Feline Respiratory Sneezing Runny Nose Eye Function Natural Strengthen Defenses Chicken Flavor 60 ML**](https://www.amazon.com/dp/B0FSKVWSJ1) VICSOM$14.294.4★1432%▲rising 15 ![Lysine for Cats L-Lysine for Cats Chews & Lysine Treats 500 Chews Immune Support with L-Lysine Supplement Colostrum Quercetin & Omega-3 Respiratory Sneezing Runny Nose Eye Chicken Flavor](https://m.media-amazon.com/images/I/51qMzNW+zDL.jpg) [**Lysine for Cats L-Lysine for Cats Chews & Lysine Treats 500 Chews Immune Support with L-Lysine Supplement Colostrum Quercetin & Omega-3 Respiratory Sneezing Runny Nose Eye Chicken Flavor**](https://www.amazon.com/dp/B0GTTYCJGQ) YOTANGO$20.754.6★482%▲rising **~~Showing 15 of 24 — show all ~~** ## **Product shelf** All 24 tracked products in this niche. Top sellersNewestTrending [![Vetoquinol Viralys - Lysine Supplement for Cats & Kittens - Supports Eye Wellness Respiratory Health & Immune Strength - Flavored Oral Powder for Easy Feeding & Daily Use - 100 Grams](https://m.media-amazon.com/images/I/41hozmb4g3L.jpg)**Vetoquinol Viralys - Lysine Supplement for Cats & Kittens - Supports Eye Wellness Respiratory Health & Immune Strength - Flavored Oral Powder for Easy Feeding & Daily Use - 100 Grams** Vetoquinol**$30.84**4.6★9,577 reviews](https://www.amazon.com/dp/B000FULBT4) [![SANTKOL L-Lysine Supplement for Cats - Immune Support - 60ML Lysine for Feline Respiratory Sneezing Runny Nose Eye Function - Natural Cat Antibiotic Drops - Roast Chicken Flavor](https://m.media-amazon.com/images/I/51IN3wzYjEL.jpg)**SANTKOL L-Lysine Supplement for Cats - Immune Support - 60ML Lysine for Feline Respiratory Sneezing Runny Nose Eye Function - Natural Cat Antibiotic Drops - Roast Chicken Flavor** SANTKOL**$20.67**4.5★1,503 reviews](https://www.amazon.com/dp/B0DFGZCD2V) [![Cat Immune Support Lysine Allergy Relief & Immune Health Supplement for Cats with L-Lysine Colostrum Quercetin & Omega-3 Soothes Sneezing Runny Nose & Itchy Skin Chicken (30-Day Supply)](https://m.media-amazon.com/images/I/51DYQaPjwOL.jpg)**Cat Immune Support Lysine Allergy Relief & Immune Health Supplement for Cats with L-Lysine Colostrum Quercetin & Omega-3 Soothes Sneezing Runny Nose & Itchy Skin Chicken (30-Day Supply)** Pet Honesty**$15.33**4.5★2,461 reviews](https://www.amazon.com/dp/B0C2B7F597) [![L-Lysine for Cats 900mg - Immune Eye & Respiratory Support Powder](https://m.media-amazon.com/images/I/41AJZ3DBrEL.jpg)**L-Lysine for Cats 900mg - Immune Eye & Respiratory Support Powder** Coco and Luna**$22.49**4.4★3,170 reviews](https://www.amazon.com/dp/B083QR6NMT) [![Vetoquinol Viralys - Lysine Supplement for Cats & Kittens - Supports Eye Wellness Respiratory Health & Immune Strength - Flavored Oral Gel for Easy Feeding & Daily Use for Picky Eaters - 5oz](https://m.media-amazon.com/images/I/31LTQAqU4yL.jpg)**Vetoquinol Viralys - Lysine Supplement for Cats & Kittens - Supports Eye Wellness Respiratory Health & Immune Strength - Flavored Oral Gel for Easy Feeding & Daily Use for Picky Eaters - 5oz** Vetoquinol**$24.49**4.5★11,209 reviews](https://www.amazon.com/dp/B00AMEBH06) [![Felisyl L-Lysine Gel for Cats & Kittens (5oz) Immune System Respiratory & Eye Health Support. Reduces Sneezing Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement Made in USA (1 Pack)](https://m.media-amazon.com/images/I/416hY7iNOhL.jpg)**Felisyl L-Lysine Gel for Cats & Kittens (5oz) Immune System Respiratory & Eye Health Support. Reduces Sneezing Runny Nose & Watery Eyes. Daily Salmon-Flavor Supplement Made in USA (1 Pack)** Felisyl**$18.29**4.4★2,212 reviews](https://www.amazon.com/dp/B00MO9SHBE) [![NOW Pet Health L-Lysine Supplement Powder Formulated for Cats NASC Certified 8-Ounce](https://m.media-amazon.com/images/I/41GzyMpSYhL.jpg)**NOW Pet Health L-Lysine Supplement Powder Formulated for Cats NASC Certified 8-Ounce** NOW Foods**$12.16**4.5★3,547 reviews](https://www.amazon.com/dp/B016WG7UF8) [![VetriScience Lysine Immunity Health Chews 250 mg Lysine Plus Immune Supplement for Cats and Kittens with Allergies Sneezing Runny Nose and Watery Eyes Chicken 120 Count](https://m.media-amazon.com/images/I/41UNAX2bMiL.jpg)**VetriScience Lysine Immunity Health Chews 250 mg Lysine Plus Immune Supplement for Cats and Kittens with Allergies Sneezing Runny Nose and Watery Eyes Chicken 120 Count** VETRISCIENCE**$18.51**4.1★11,871 reviews](https://www.amazon.com/dp/B002ALE9RM) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Pet Friendly**22% *“My cat approved”* **Taste-Overall**15% *“Good taste”* **Quality-Overall**9% *“Excellent product”* **Flavor**7% *“Good flavor”* **Value For Money**6% *“Good Value”* **Ease Of Use**5% *“Package is easy to open”* **Soothing/Teething**4% *“She seems happy and calm”* **Ease Of Chewing/Swallowing**4% *“The chews are soft”* **Allergies**4% *“Good for allergies”* **Ingredients-Overall**2% *“Good ingredients”* ### **What buyers complain about ** **Allergies**12% *“Cat allergy”* **Smell**9% *“It smells bad”* **Value For Money**9% *“The whole thing costed me almost $2,000”* **Taste-Overall**7% *“taste like poo, apparently”* **Indigestion**6% *“My cat had bad stomach from these”* **Functionality-Overall**5% *“It did not work for my cat”* **Flavor**4% *“not a popular flavor for us unfortunately”* **Size-Overall**4% *“Too big”* **Ingredients-Overall**2% *“Formula changed”* **Ease Of Use**2% *“Cant use”* #### **Top return reasons**- Functionality-Overall16% - Ease Of Chewing/Swallowing15% - Advertised Vs Actual Product12% - Flavor9% - Leak-Proof9% - Smell5% - Indigestion5% - Defective Material/Parts4% - Value For Money3% - Ingredients-Overall2%