- Supports immune system function, eye health, and respiratory health in cats
- Combines L-lysine (500 mg) with DMG (50 mg) per 2-chew dose for dual-action support
- Palatable hydrolyzed chicken liver flavour — suitable for all weight ranges
- Safe for both adult cats and kittens
- All-natural formula, daily administration 7 days a week
- Health Canada authorized Veterinary Health Product (NN.X5P6)
Product Description:
L-Lysine Pro, 1 x 120-chew bag
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Feline herpesvirus (FHV-1) affects the vast majority of cats and can flare up during periods of stress, illness, or immune suppression — causing watery eyes, sneezing, nasal congestion, and upper respiratory symptoms. Once a cat is infected, the virus remains dormant in the body for life and can reactivate at any time. Early and consistent immune support is the most effective way to manage these flare-ups and keep your cat comfortable.
L-Lysine Pro by  VetriSCIENCE Animal Health is a dual-action immune support supplement designed specifically for cats. It combines two proven ingredients — L-lysine and dimethylglycine (DMG) — in a palatable chicken liver flavoured chew that cats of all ages and sizes readily accept.
L-lysine is an essential amino acid that cats cannot produce on their own. At 500 mg per 2-chew dose, it supports normal antibody, hormone, and enzyme production while promoting healthy growth and development through collagen synthesis. L-lysine has been widely used in feline medicine to support cats during upper respiratory and eye health challenges.
DMG (dimethylglycine) at 50 mg per dose provides complementary immune support by promoting the normal production of vitamins, hormones, neurotransmitters, antibodies, and nucleic acids. It also helps maintain normal energy levels, which is particularly beneficial for cats recovering from illness or dealing with chronic immune stress.
The hydrolyzed chicken liver flavour makes daily administration straightforward — most cats eat the chews willingly as treats. For finicky eaters, chews can be broken or cut in half and mixed with food. The formula is suitable for cats of all weight ranges, from kittens to senior cats.
L-Lysine Pro is an all-natural formula registered with Health Canada as a Veterinary Health Product (NN.X5P6), confirming it meets Canadian safety and quality standards.
Key Ingredients:
L-lysine (500 mg per 2 chews) — An essential amino acid that supports antibody and enzyme production, promotes collagen synthesis, and is widely used to support feline immune, eye, and respiratory health.
Dimethylglycine HCl / DMG (50 mg per 2 chews) — Supports immune system function and the production of vitamins, hormones, neurotransmitters, and antibodies. Helps maintain normal energy levels during immune challenges.
Directions for Use:
Administer daily, 7 days a week.
Adult cats: 1-2 chews, twice daily. Kittens: 1 chew, twice daily.
For finicky eaters, break or cut chews in half and offer with food.
L-lysine is one of the most commonly recommended supplements in feline medicine, particularly for cats with a history of upper respiratory flare-ups or eye discharge. What makes L-Lysine Pro a better choice than standalone L-lysine powders is the addition of DMG, which provides broader immune modulation beyond what lysine alone can offer. The chewable format is also a significant practical advantage — many cat owners struggle with lysine powders that their cats refuse to eat. I recommend starting with the full dose (2 chews twice daily) during active symptoms or stressful periods like boarding or moving, then maintaining at 1 chew twice daily for ongoing support.Â
FAQ Accordion:
Q: What symptoms suggest my cat could benefit from L-Lysine Pro? A: Watery or goopy eyes, sneezing, nasal congestion, and recurring upper respiratory episodes are common signs. Cats under stress — from boarding, a new pet in the household, or moving — are also good candidates for daily immune support.
Q: Can I give this to my kitten? A: Yes, L-Lysine Pro is safe for kittens at a dose of 1 chew twice daily. The formula is suitable for cats of all ages and weight ranges.
Q: How long should my cat take this supplement? A: Many cat owners use L-lysine as a long-term daily supplement, especially if their cat has a history of herpesvirus flare-ups. During active episodes or high-stress periods, use the full adult dose. For ongoing maintenance, your veterinarian can help determine the ideal schedule.
Q: My cat won't eat the chews. What can I do? A: Try breaking or cutting the chews in half and mixing them into a small amount of wet food or a lickable treat. The hydrolyzed chicken liver flavour is accepted by most cats, but finicky eaters sometimes prefer the supplement hidden in food rather than offered as a standalone treat.
Q: Is this the same as the L-lysine powder I see at pet stores? A: Not quite. Most pet store L-lysine products contain only lysine in powder form. L-Lysine Pro by  VetriSCIENCE adds DMG for broader immune support and comes in a chewable format that is significantly easier to administer. It is also Health Canada authorized (NN.X5P6), which many generic lysine powders are not.
