Best Immune System Supplements for Cats
Updated May 2025
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Best Immune System Supplements for Cats
2025 Buyer's GuideUpdated May 2025
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1
2
2
Rocco & Roxie Allergy Relief for Cats, Cat Supplements & Vitamins, Probiotics to Support Gut Health, Fish Oil for Skin, Sneezin...
Effectiveness
Taste
Calming effect
Eatability
Scratching resistance
Health benefits
3
3
L-Lysine Supplement for Cats 900mg/scoop - Cat Supplement for Sneezing and Runny Nose, Cold, Immune Support, Eye Function, and ...
COCO AND LUNA
Effectiveness
Health benefits
Mixability
Sneezing
Ease of use
4
4
Vetoquinol Viralys Daily L-Lysine Powder for Cats and Kittens, Fish Flavored Lysine Supplement for Cats and Kittens to Support ...
Works well
Immune system
Taste
Value for money
Eye health
Ease of use
5
5
Pet Honesty Cat Multivitamin Crunchy & Creamy Chews - Cat Treats for Health + Immune, Joint Support, Skin & Coat, & Digestion -...
Vitamin content
Value for money
Taste
Dog love
Energy level
Shinier coat
6
6
VetriScience Vetri Lysine Plus - 120 Chews - Immune Support Cat Supplements and Vitamins with L-Lysine and DMG for Immunity and...
Health
Value for money
Taste
Effectiveness
Sneezing
7
7
Vetoquinol Viralys Daily L-Lysine Gel for Cats and Kittens, Maple Flavored Lysine Supplement for Cats and Kittens to Support Im...
Effectiveness
Taste
Cat health
Ease of use
Appeal
Health
8
8
Purina Pro Plan Veterinary Supplements FortiFlora Cat Probiotic Supplement for Cats with Diarrhea - 30 ct. Box
Taste
Odor
Quality
Ease of use
9
10
10
Tomlyn Immune Support Daily L-Lysine Supplement, Fish-Flavored Lysine Powder for Cats and Kittens, 3.5oz
Health benefits
Effectiveness
Taste
Sneezing
Value for money
Eye clarity
Our Top Choice
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