by Team WellJoy
A quick explainer
Lysine is an essential amino acid and a building block in your pet’s body, helping cats create the protein that’s needed for almost everything their body does.
Whether it’s healthy muscles or strong immunity, Lysine supports all the important biological systems that keep a pet happy, active and resilient.
How it works

Think of Lysine as an essential puzzle piece – it fits into various everyday biological processes, playing a foundational role in supporting your pet’s overall health.
It’s critical for protein synthesis, which is needed to build and repair tissues including muscles (all-important for that hunting and chasing your cat loves so much).
It also helps produce important compounds that feed into a healthy immune system, so your pet can better defend against illness. There’s currently ongoing research into how Lysine can potentially support cats’ immune response during times of stress, too.
Importantly, cats can’t make Lysine in their own body – they need to get it from their diet, so introducing a treat containing Lysine can help them get the maximum amount they need.
How Lysine helps your pet every day
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Immune support: Lysine keeps your cat’s immune system strong, especially if they’re going through a stressful time.
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Protection from wear and tear: Leaping up a cat tree or long play sessions all have an impact, and Lysine supports with everyday recovery and repair.
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Strong muscles: Healthy muscles are built by protein, and Lysine is an essential ingredient in creating protein.
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Glossy coats: Lysine plays an important role in the protein structures that produce healthy skin and fur.
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Bouncy energy: Supporting your cat’s body systems with Lysine helps keep them active and engaged during playtime.
Find Lysine in WellJoy’s supplements
WellJoy’s Immune+ Supplement for Cats contains Lysine to help boost your cat’s everyday immune health. We’ve combined it with antioxidants Astaxanthin and Quercetin Dihydrate, protein Colostrum, Vitamin E and our gut microbiome-supporting biotic blend GutBoost® so that Lysine can get to work at its best across your pet’s body.
We also offer Lysine in our Immune+ Treats for cats, for rewards with a wellbeing boost. In our treats, Lysine is combined with Omega-3 Fatty Acids, plus our signature GutBoost® biotic blend.
Introducing your pet to our Immune+ supplement can help them stay resilient, recover more effectively and boost everyday wellness for more joyful play, rest and recovery.
We’re proud to say that all of WellJoy’s content is fact-checked and verified by a Pet Loyalist team, including a veterinarian trained in companion animal nutrition and a PhD board-certified companion animal nutritionist.