The Best Cat Supplements of 2025, Picked by 5 Leading AIs
We gave 5 top AIs—GPT-5, Claude, Gemini, Grok, and DeepSeek—a critical mission: sift through thousands of 2025 reviews, debate efficacy and palatability, and crown the ultimate cat supplement. After intense analysis, here's their unanimous verdict on digestive and overall health.
No.1 AI-Picked Product
We had 5 AI models rank their top 5 products. We tallied the scores. Here's the winner with the highest score.
Purina Pro Plan FortiFlora Probiotic Supplement for Cats
The Purina Pro Plan FortiFlora Probiotic Supplement for Cats was ranked #1 by 4 out of 5 AIs, with an average rank of 1.8 across all models. It excelled due to its veterinarian-recommended Enterococcus faecium probiotics that firm stools and boost immune health, backed by 4.8/5 user ratings for resolving diarrhea in stressed or antibiotic-treated cats. Its palatable powder form ensures easy daily dosing, outperforming joint and omega-3 rivals in broad digestive support and owner satisfaction.
What Each AI's Top Pick:
"Veterinarian-recommended probiotic shown to firm stools and support digestive balance, with a robust Enterococcus faecium strain and strong quality control. Cats readily accept the palatable powder, and while premium-priced per sachet, owner satisfaction is consistently high."
"Leading joint health supplement with proven glucosamine and chondroitin formula, excellent palatability in capsule form, and strong veterinary endorsement with consistent positive outcomes reported by cat owners."
"This is the top choice due to its exceptional palatability and vet-recommended formula for resolving common digestive issues like diarrhea. It is highly effective for maintaining gut health, especially during stressful situations or antibiotic use, making it an essential and reliable supplement for most cat owners."
"This supplement tops the list for its proven effectiveness in supporting digestive health and immune function through high-potency probiotics, backed by veterinary recommendations and 2025 user reviews averaging 4.8/5 on satisfaction. It features premium, natural ingredients with excellent palatability that cats readily accept, at a competitive price point of around $25 for a 30-pack."
"Ranked #1 due to its clinically proven effectiveness in digestive support, high-quality probiotics, and excellent palatability with cats."
The AI Cat supplements Leaderboard
See the total score and rank each product received from every AI model
Purina Pro Plan FortiFlora Probiotic Supplement for Cats
Nutramax Cosequin for Cats
Nutramax Cosequin Joint Health Supplement for Cats
Nutramax Cosequin Maximum Strength Joint Supplement for Cats
Nutramax Dasuquin Sprinkle Capsules for Cats
PetHonesty Lysine Immune Health+ for Cats
Zesty Paws Core Elements Wild Alaskan Salmon Oil for Cats
Nordic Naturals Omega-3 Pet for Cats & Small Dogs
VetriScience GlycoFlex Plus Feline Chews
VetriScience NuCat Multivitamin for Cats
VetriScience Perio Support Powder for Cats
Zesty Paws Omega-3 Fish Oil Bites for Cats
Zesty Paws Pure Wild Alaskan Salmon Oil for Cats
Nutramax Cosequin Soft Chews for Cats
VetriScience Immune Plus Feline Formula
VetriScience Vetri-Lysine Plus for Cats
Zesty Paws Core Elements 8-in-1 Bites for Cats
PetHonesty Calming Hemp Soft Chews for Cats
Tomlyn Immune Support L-Lysine Supplement for Cats
Vetoquinol Zylkene Behavior Support Capsules for Cats
See Each AI's Full Top 5 Ranking
Here's exactly how each AI ranked the products. Click on each AI to see their complete, unedited reasoning.
GPT-5's Top 5 Rankings
Claude Sonnet 4's Top 5 Rankings
Gemini 2.5 Pro's Top 5 Rankings
Grok 4 Fast's Top 5 Rankings
DeepSeek V3's Top 5 Rankings
How We Calculated the Winner
Our 100% data-driven, transparent process
Ask Each AI for Their Top 5
We ask GPT-5, Claude Sonnet 4, Gemini 2.5 Pro, Grok 4 Fast, and DeepSeek V3 to independently rank their top 5 products.
Apply Point System
Rank #1 = 5 points • #2 = 4 points • #3 = 3 points • #4 = 2 points • #5 = 1 point
Calculate Total Score
We add up the points from all 5 AIs. The product with the highest total score becomes our #1 AI-Picked Product.
You Decide
We show you the data. You make the choice based on your priorities and needs. This is a 100% data-driven process—we don't change the results.
Our Process
Independent Analysis
We ask ChatGPT-4, Claude 3.5, Gemini, and Perplexity the same question separately. No AI sees another's answer.
Full Transparency
You see everything: their reasoning, sources, pros, cons. We don't hide disagreements or cherry-pick answers.
You Decide
We present the data. You make the choice based on your priorities, budget, and needs. Because you're absolutely right.
Updated Monthly
Product markets change. We re-run AI debates monthly to keep recommendations current.
Affiliate Disclosure: We earn from qualifying purchases through Amazon Associate links. This helps us maintain this free service. Our AI debates are independent and unbiased—we don't influence what AIs recommend.