L-Lysine Immune Support Chews Supplement for Cats
Verified Jun 11, 2026
A chewable lysine supplement for cats of all ages, providing 125 mg of L-lysine per chew in a chicken- and salmon-flavored base. The formula delivers extra lysine, an amino acid often used to support normal immune and respiratory function, in a relatively low-calorie treat-style format. It’s designed to be given alongside your cat’s regular complete and balanced diet.
This is a focused lysine supplement in a palatable chew form, which can make daily dosing much easier for many cats. The protein-rich chicken meal and liver base, plus added salmon oil, give good taste and some additional nutrients, while each chew clearly states the lysine content. It does rely on multiple sugars and synthetic preservatives, which are safe but not ideal for cats needing strict calorie or additive control, so it’s best used as a targeted supplement rather than a frequent treat.
The KibbleLab Score (1–10) is assessed from publicly available product data. Our evaluation is science-based, not marketing-based.
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At a Glance
KibbleLab Review
Strengths
- Provides a defined amount of L-lysine (125 mg per chew), making dosing straightforward for immune or respiratory support under veterinary guidance.
- Uses animal-based ingredients like chicken meal, chicken liver, and salmon oil, which are generally very palatable for cats and contribute quality protein and fats.
- Relatively low calories per chew (about 5 kcal), which helps limit extra calorie intake when used as directed.
- Includes effective preservatives such as potassium sorbate, parabens, and mixed tocopherols to help maintain product stability and safety over time.
Considerations
- Contains chicken and chicken liver, which are common allergens for some cats; it would not be a good choice for cats with known chicken allergies.
- Includes several sugar sources (cane molasses, powdered sugar, corn starch), so it adds extra simple carbohydrates that may not be ideal for overweight cats or those with diabetes when used frequently.
- This is a supplement, not a complete and balanced diet, so it should only be given in addition to a regular cat food that meets all nutritional requirements.
- Uses synthetic preservatives (methylparaben, propylparaben) which are considered safe but may not be preferred by some owners and are unnecessary for cats that can’t tolerate certain additives.
Full Ingredient List
Ingredients and analysis reflect manufacturer data at the time of our last update and can change without notice. Always check the actual product packaging before feeding.
Ingredient filtering helps identify compatible options but is not a substitute for a veterinary elimination diet.
Top 5 Ingredients Explained
01
Chicken
Chicken is a common animal-based protein in dog and cat foods, supplying essential amino acids, B vitamins, and energy-dense fats that support muscle maintenance, growth, and overall health; for cats it also contributes toward dietary taurine but must be present in sufficient amounts or provided via supplementation. It is prized for its digestibility and palatability, though some pets develop sensitivities or allergies to chicken, and nutritional value and safety depend on ingredient quality and processing—raw chicken carries pathogen risks and whole bones can pose choking or GI hazards.
02
Chicken Liver
Chicken liver is a nutrient-dense organ meat commonly used in pet foods and treats as a highly palatable protein source and flavor enhancer, providing concentrated vitamins (especially vitamin A and B-complex), iron, and copper that support energy metabolism, red blood cell formation, and skin/coat health in both dogs and cats. Because it is so rich, liver should be fed in moderation—excessive intake can cause vitamin A toxicity, and its high fat content and risk of bacterial contamination mean it should be properly sourced or cooked and limited for pets with pancreatitis or specific dietary restrictions.
03
Glycerol
Glycerol (glycerin) is used in pet foods primarily as a humectant and sweetening agent to retain moisture, improve texture and palatability, and serve as a solvent or carrier in wet foods, treats, and liquid supplements. It provides a modest source of metabolizable energy for dogs and cats, but in large amounts can cause gastrointestinal upset and may affect blood glucose, so products intended for diabetic pets or sensitive animals should be used with caution.
04
Cane Molasses
Cane molasses is a viscous sweetener and palatability enhancer used in pet foods and treats to add simple carbohydrates, help bind ingredients, and contribute trace minerals like iron, calcium, potassium and magnesium along with small amounts of B vitamins. It can improve taste and texture but is high in sugars and calories, so it should be used sparingly—excessive intake can contribute to weight gain, dental issues, or unstable blood glucose in diabetic or obese pets.
05
L-Lysine Hydrochloride
L‑Lysine hydrochloride is a highly bioavailable supplemental essential amino acid commonly added to pet foods to ensure adequate lysine for protein synthesis, growth, tissue repair and immune function in both dogs and cats. The HCl form is stable and easy to formulate, but supplementation should follow AAFCO or veterinary guidelines because excess lysine can create amino acid imbalances and routine therapeutic uses (for example against feline herpesvirus) have mixed, inconclusive evidence.
Nutritional Breakdown
How to read As Fed versus Dry Matter
As fed shows the numbers straight off the label, water included. Dry matter removes the water so you can compare a wet food and a dry food fairly.What is calorie density
How many calories the food packs per unit. Denser foods mean smaller portions for the same calories.Product Details & Brand
Product Specs
Brand
Under the Weather Pet is a pet food and supplement brand offering freeze-dried bland diets, broth toppers, and wellness chews for dogs and cats. The brand targets health-conscious pet owners seeking convenient, vet-formulated solutions for digestive upset and recovery support.
Visit Under the Weather PetManufacturer
All Under the Weather products are manufactured in the United States in facilities that follow FDA and USDA guidelines. The company emphasizes quality control, sourcing premium human-grade ingredients, and producing small batches to ensure safety and nutritional integrity.
Manufacturing details are compiled from public sources and not independently verified; they may not reflect contract manufacturing or co-packing.
Recall History
Under the Weather Pet L-Lysine Immune Support Chews Supplement for Cats has no recalls since 2014.
Source: FDA Pet Food Recall Database · Monitored daily
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Frequently Asked Questions
Has Under the Weather Pet ever been recalled?
We have no recalls on record for Under the Weather Pet. We monitor the FDA Pet Food Recall Database daily.
How does KibbleLab rate foods?
Our scores are based on ingredient composition, nutritional profile, AAFCO compliance, and health considerations. We don't penalize by-products, grains, or synthetic preservatives. Brands cannot pay for higher scores.
Is KibbleLab a substitute for veterinary advice?
No. KibbleLab provides data-driven food analysis, not medical advice. Always consult your veterinarian before making dietary changes, especially for pets with health conditions.
KibbleLab provides informational content only. This is not veterinary advice. Always consult a qualified veterinarian before changing your pet's diet.
KibbleLab may earn affiliate commissions through product links. No one can pay for a higher score, or to change what we recommend for your pet.
Product data sourced from manufacturer websites, AAFCO statements, and FDA recall database. Last verified dates reflect our most recent data check.
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