Vet Reviewed

GCP Cat L-Lysine - 200 servings

3 reviews
Healthy Cats, Strong Immunity – Supports clear breathing, bright eyes, and daily defense against viral infections. Powered by 100% pure L-Lysine for triple-action immune, respiratory, and eye health support.

Cat size:

Amount:
Add Extras to your subscription
Save 15% GCP Flea & Tick Natural Defense for Dogs - 100 Soft Chews
GUARDIAN PET

GCP Flea & Tick Natural Defense for Dogs - 100 Soft Chews

Natural Pest Protection

$34.99 $40.99
GCP Flea & Tick Natural Defense for Cats - 100 Soft Chews
GUARDIAN’S CHOICE PET

GCP Flea & Tick Natural Defense for Cats - 100 Soft Chews

$26.99 $26.99
Save 7% GCP Purrbiotics - Daily Probiotics for Cats - 120 Servings
GUARDIAN’S CHOICE PET

GCP Purrbiotics - Daily Probiotics for Cats - 120 Servings

Daily Digestive Support

$27.99 $29.99
Save 35% GCP Breath Boost Bites for Dogs
GUARDIAN’S CHOICE PET

GCP Breath Boost Bites for Dogs

Puppy Growth Support

$20.79 $31.99
Save 14% GCP OmegaPaws Chews for Dogs - 90 Tasty Soft Chews
GUARDIAN’S CHOICE PET

GCP OmegaPaws Chews for Dogs - 90 Tasty Soft Chews

Puppy Growth Support

$27.50 $31.99
Save 25% NO POO Probiotic Chews - Stool Eating Deterrent
GUARDIAN’S CHOICE PET

NO POO Probiotic Chews - Stool Eating Deterrent

Gut health

$23.99 $31.99
Created with Sketch.
All transactions secured and encrypted
Expected delivery in 3-5 business days
All of our products are shipped from the USA

FAQs

Q: How do I give Cat L-Lysine to my cat?

A: It's easy! Cat L-Lysine comes in a powder form that you can sprinkle right on top of your cat's food. No pills, no hassle — just sprinkle and serve!
Q: Can I mix Cat L-Lysine with wet food?

A: Yes, absolutely! Cat L-Lysine works perfectly with both wet and dry food. Simply sprinkle the recommended dose onto their meal for easy daily supplementation.
Q: How soon will I see results?

A: Many cat parents notice improvements in their cat’s respiratory comfort, like reduced sneezing and watery eyes, within a few weeks. For best results, make sure to use it consistently as part of their daily routine.
Q: Can I give Cat L-Lysine with other supplements or medications?

A: In most cases, yes. However, we always recommend checking with your vet if your cat is on prescribed medications or has a specific dietary regimen.
Q: What makes Cat L-Lysine different from other lysine supplements?

A: Cat L-Lysine is specially formulated with high-quality ingredients and free from artificial colors and flavors, designed to support your cat’s immune and respiratory health. Unlike other supplements, it’s specifically made for cats, with a dosage that meets their unique needs.
Q: What benefits does Cat L-Lysine offer?

A: Cat L-Lysine helps with:

  • Supporting immune system function
  • Reducing flare-ups from feline herpesvirus (sneezing, watery eyes, nasal discharge)
  • Promoting respiratory health and eye comfort
  • Strengthening your cat’s overall well-being naturally
Q: Can I give Cat L-Lysine daily?

A: Yes! Cat L-Lysine is formulated for daily use and can be safely given every day to support long-term respiratory and immune health.

60 Day Money Back Guarantee

Our products come with a 60-day no-hassle guarantee. If your cat decides they don’t like the probiotics, or if it “isn’t working out,” we’ll refund you. Hassle free.

Customer Reviews

Overall rating: 4.3 / 5 from 3 reviews.

Customer photo review of GCP Cat L-Lysine - 200 servings

Our kitty is an FELV cat. We were recommended this product and it has worked wonders. She's super healthy and blood tests prove it. I believe it's her best chance of staying healthy. We will continue to use the product.

Susanna R. 5/5 Verified

GCP Cat L-Lysine - 200 servings

My male cat Chub was having coughing and wheezing last winter 2025. I saw this advertised and gave it a chance. Thankfully it works well and easy to administer cause he eats it mixed with soft food . Both cats eat it everyday because they are out door in all kinds of weather and are doing great. Thanks

Vivian G. 5/5 Verified

GCP Cat L-Lysine - 200 servings

My cat loved it at first but now I have to mix it in with wet food for her to eat it. She’s still sneezing so I don’t know if anything else is going on. I’ve taken her to the vet and he gave her an antibiotic shot but didn’t seem to make much of a difference.

Sue H. 3/5 Verified

GCP Cat L-Lysine - 200 servings