--- title: "lysine powder for cats — Niche Verdict: Skip it (40/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/pet-supplies/lysine-powder-for-cats" last_updated: "2026-07-10T03:31:12.124Z" locale: en meta: description: "a concentrated shelf (top 5 take 98% of clicks) — lysine powder for cats doesn't clear our bar today." "og:description": "a concentrated shelf (top 5 take 98% of clicks) — lysine powder for cats doesn't clear our bar today." "og:title": "lysine powder for cats — Niche Verdict: Skip it (40/100) | Amazon United States - Flapen" --- Back to Flapen home # **lysine powder for cats** **Skip it****40/100 ** a concentrated shelf (top 5 take 98% of clicks) — lysine powder for cats doesn't clear our bar today. **Market/yr** **$444K** **Growth (1y)** **+107.0%** **Products** **6** **Brands** **5** was 6 a year ago **Sellers** **17** **Price range** **$12.16–$30.84** **Returns** **0.0%** **Rating** **4.5★** **Skip it** Scored 40/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **22** ×0.30 Growth **66** ×0.30 Competition **0** ×0.20 Quality gap **40** ×0.10 Returns **100** ×0.10 ## **Demand** Weekly Amazon search volume, last 104 weeks — +107.0% year over year. 4K2KPrime Day '24Spike '25Holiday '25Spike '26Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26 ## **Seasonality** Monthly demand index across the year — 1.00 is average. JFMAMJJASOND Peak months: Jan, Feb, May, Jun · busiest ÷ quietest = 3.7× ## **Competition** - Vetoquinol79% - Coco and Luna8% - TOMLYN6% - NOW Foods4% - Holy Pets2% - Other0% The top 5 products capture 98% of clicks — a locked-up shelf that new listings rarely crack. 5 brands and 17 sellers compete here. **Brands** **5 **▼falling was 6 a year ago **Sellers** **17** **Top 5 brand share** **100%** #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★9,57748%▼falling 2 ![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★11,20932%▲rising 3 ![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★3,1708%▼falling 4 ![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★5,4196%▼falling 5 ![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%▲rising 6 ![Holy Pets 100% Pure L-Lysine Powder for Cats No Flavors No Fillers or Preservatives 1 000mg per Scoop Immune Respiratory & Eye Support Helps with Sneezing Runny Nose & Cold Symptoms](https://m.media-amazon.com/images/I/51Z6F9hf4sL.jpg) [**Holy Pets 100% Pure L-Lysine Powder for Cats No Flavors No Fillers or Preservatives 1 000mg per Scoop Immune Respiratory & Eye Support Helps with Sneezing Runny Nose & Cold Symptoms**](https://www.amazon.com/dp/B0F3KJQS65) Holy Pets$20.624.4★1082%▲rising ## **Product shelf** All 6 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) [![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) [![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) [![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** TOMLYN**$20.29**4.6★5,419 reviews](https://www.amazon.com/dp/B00BERPOP4) [![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) [![Holy Pets 100% Pure L-Lysine Powder for Cats No Flavors No Fillers or Preservatives 1 000mg per Scoop Immune Respiratory & Eye Support Helps with Sneezing Runny Nose & Cold Symptoms](https://m.media-amazon.com/images/I/51Z6F9hf4sL.jpg)**Holy Pets 100% Pure L-Lysine Powder for Cats No Flavors No Fillers or Preservatives 1 000mg per Scoop Immune Respiratory & Eye Support Helps with Sneezing Runny Nose & Cold Symptoms** Holy Pets**$20.62**4.4★108 reviews](https://www.amazon.com/dp/B0F3KJQS65) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Quality-Overall**15% *“Great product and cats love it”* **Taste-Overall**14% *“They both love the taste of the powder”* **Value For Money**13% *“Good Value”* **Flavor**8% *“Flavor my cat loves”* **Pet Friendly**6% *“So easy to throw into my cats daily routine”* **Advertised Vs Actual Product**6% *“As Advertised”* **Ease Of Use**6% *“Easy to use”* **Soothing/Teething**5% *“Helps with respiratory problems”* **Smell**4% *“It has a strong fish smell”* **Durability**2% *“Always Reliable”* ### **What buyers complain about ** **Allergies**12% *“showes signs of allergy just one day after he started taking it”* **Value For Money**11% *“The whole thing costed me almost $2,000”* **Smell**9% *“It does have a fishy smell”* **Functionality-Overall**7% *“Didn't work for my cats”* **Flavor**7% *“He does not like the maple flavor at all”* **Indigestion**5% *“he started coughing immediately after eating”* **Taste-Overall**5% *“Tastes terrible”* **Ease Of Use**4% *“Cant use”* **Ease Of Chewing/Swallowing**3% *“on Chewy”* **Ease Of Cleaning**2% *“will not let me clean his eyes”* #### **Top return reasons**- Advertised Vs Actual Product33% - Functionality-Overall33% - Ethical Trade/Fair Trade33%