The 20 Best Probiotics For Cats
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The best probiotics for cats are packed with living bacteria, focus on beneficial strains, and adhere to stringent quality standards.
Because it’s a human-grade probiotic backed by the latest research, we recommend Nom Nom’s full-spectrum probiotic as the best probiotic for cats. But there’s no single probiotic supplement that’s right for every cat or every budget.
We’ve sifted through the world of probiotic supplements for pets and found 20 of the best probiotics you can give your cat.
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At a Glance: Best Probiotics for Cats To Buy
We highly recommend looking at the comparison table we have below where we highlighted the features of each product. You’ll also find more detailed information about each product later in the article.
Compare Best Probiotics For Cats
Best For Cats Who’ve Lost Their Appetite
2. Purina Pro Plan Veterinary Diets FortiFlora Probiotic Gastrointestinal Support Cat Supplement |
Best Timed-Release Probiotic
3. PRO-Pets Probiotics for Dogs and Cats |
Best For Allergies
4. Jarrow Formulas Pet Dophilus Powder for Dogs & Cats |
Best For People On A Budget
5. NOW Supplements, 8 Billion Acidophilus & Bifidus 120 Veg Capsules |
Best For Diarrhea
6. NOW Supplements, Saccharomyces Boulardii,Probiotic 5 Billion CFU, 60 Veg Capsules |
Best For Daily Maintenance
9. Nusentia Probiotic Miracle Premium Blend Dog & Cat Supplement |
Best For Sick Cats
10. Tomlyn Pre & Probiotic Water Soluble Powder Cat Supplement |
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Supplement Type
Probiotic |
Supplement Type
Probiotic |
Supplement Type
Probiotic |
Supplement Type
Probiotic |
Supplement Type
Capsule |
Supplement Type
Probiotic |
Supplement Type
Probiotic |
Supplement Type
Probiotic |
Supplement Type
Probiotic |
Supplement Type
Probiotic |
Flavor
No Added Flavor |
Flavor
Animal Digest |
Flavor
Animal Digest |
Flavor
Animal Digest |
Flavor
None |
Flavor
None |
Flavor
None |
Flavor
Animal Digest |
Flavor
Animal Digest |
Flavor
Animal Digest |
Key Benefit
A concentrated, well-researched probiotic supplement |
Key Benefit
An extremely palatable probiotic supplement |
Key Benefit
A timed-release probiotic designed for better survivability |
Key Benefit
A trusted probiotic that receives positive customer reviews |
Key Benefit
A human-quality probiotic with generous doses of trusted strains |
Key Benefit
An effective solution for cats with diarrhea |
Key Benefit
An extremely diverse supplement containing 14 strains of probiotic bacteria and yeast |
Key Benefit
An easy-to-administer gel ideal for sick cats and kittens |
Key Benefit
A well-respected probiotic supplement |
Key Benefit
A well-balanced probiotic that comes in packets |
Ideal For
Cats with digestive issues |
Ideal For
Seniors, sick cats, cats with digestive issues |
Ideal For
Support Your Pet’s Digestive Tract |
Ideal For
For cats and dogs to maintain a balanced intestinal microbial ecosystem |
Ideal For
For maintaining healthy intestine |
Ideal For
For maintaining healthy intestine |
Ideal For
Help support your pet's gastrointestinal health and wellbeing |
Ideal For
Relieves intestinal stress with lactic acid producing bacteria |
Ideal For
Help support proper digestive and bowel health |
Ideal For
Premium formula to support wellness for dogs and cats |
How Do You Choose The Best Probiotics For Cats?
Probiotics are microorganisms—residents of the microbiome—that are beneficial to the host. They’re usually bacteria. Some are yeast. They come in different species and strains and are developed from different sources. All of them confer benefits by supporting and fortifying the population of friendly microorganisms already existent in your cat’s body.
Indeed, the word “probiotic” is a combination of the Latin preposition pro, meaning “for”, and the Greek adjective βιωτικός (biōtikos), meaning “fit for life” or “lively”.
Probiotics promote life—at least in theory. In reality, the world of probiotics is just as sticky and troubled as that of any other supplement. Keeping a few factors in mind will help you to wade through the exploding probiotic market and find a product you can trust.
The Best Probiotics For Cats Are High-quality Products That You Can Trust.
Like most health supplements, probiotics are prone to overzealous marketing and inconsistent product quality.
Bacteria are often dead on arrival, meaning that the probiotics you get aren’t the probiotics the label promises. When Labdoor tested thirty-seven leading probiotic supplements, they found that about half the products contained amounts of viable bacteria that differed from their label claims by 50% or more.
Pet probiotics have even more problems. Pet probiotic producers can get away with inaccurate CFU counts, high percentages of dead bacteria, and worse. One study found that of twenty-five of the most popular pet probiotics, three of them claimed to contain bacterial species that didn’t even exist.
Because there’s so little understanding of which probiotics cats need and how what works best, there’s almost no standardization in the pet probiotic world. They don’t always mention viability on the label, contain a smorgasbord of bacteria that may or may not help cats, and make claims that aren’t backed up by any research.
While there’s no comprehensive database of cat probiotics to tell us which supplements are and aren’t top-notch, we can learn about the company’s background, find out how the products are formulated, and run customer reviews through the analyzer at FakeSpot.com. Additionally, look for companies that are on the National Animal Supplement Council (NASC) list of preferred suppliers.
And of course, if you want to get a great probiotic with a history of reliability, don’t be afraid to give your cat a supplement made for people.
Are Human Probiotics Safe For Cats?
Almost 100% of the time, human probiotics are as safe for cats—or safer—than those marketed for pets. Most cat-oriented probiotics are based on human microbiome research anyway, so there’s little risk of human probiotics giving your cat the wrong species of bacteria. The only drawback is that human probiotics don’t contain the meaty flavor additives found in some cat-oriented probiotics.
Though Research On The Feline Microbiome Is Limited, We Do Know That A Few Bacteria Species Are Essential.
The best probiotics for cats include well-researched species of bacteria with known benefits for cats. Though other, less-known, species and strains may be beneficial, only a few have demonstrated positive effects in cats.
- Lactobacillus acidophilus: This probiotic organism has beneficial immunomodulatory effects, potentially helping cats with allergies and other inflammatory issues. It also helps to support a healthy balance of bacteria in the intestinal tract.
- Bifidobacterium animalis: Two strains of B. animalis have been studied extensively in both humans and animals, showing an ability to control diarrhea and improve gastrointestinal health.
- Enterococcus faecium: This bacteria has been shown to reduce diarrhea in cats.
- Saccharomyces Boulardii: This yeast has a well-documented history of benefits for people, cats, and other animals with diarrhea.
In General, The Best Probiotics For Cats Provide Between 1 Billion And 5 Billion Cfus (Colony Forming Units) Per Day.
CFUs or colony-forming units is a term referring to viable (living) cells. A higher CFU count translates to more living microorganisms going into your cat’s body.
As a general rule, probiotics for cats should deliver at least 1 billion CFUs. From there, it appears that healthy cats will get benefits from CFU counts ranging between one and five billion, while higher doses may help cats with serious health issues. High doses of certain species can help to prevent and treat antibiotic-related health issues, neurofitnessfoundation.org/amoxil-treat-infections/ IBD, and other problems.
Remember that the CFUs in the bottle aren’t the same as the ones that will eventually populate your cat’s gut. A good probiotic will thrive and multiply inside of your cat’s colon. Too many CFUs of too many different strains and species could be less effective than a single-strain, relatively low-CFU supplement. Not all bacteria play nicely together and dilution is a real concern.
Prebiotic Fiber Is Also Important.
Prebiotic fiber is a type of fiber that feeds friendly bacteria in the gut. Sources of prebiotic fiber include inulin, chicory root, and fructooligosaccharides (often abbreviated as FOS). You’ll find prebiotics in many commercially-available cat foods. They’re also added to many probiotic supplements.
When a probiotic supplement contains prebiotics in addition to fiber, it’s called a synbiotic—a synergized blend of bacteria and the food it needs to thrive.
Our Top Picks For The Best Probiotics For Cats
Nom Nom Probiotic Support Full Spectrum Probiotic
Product Info
- Supplement Type: Probiotic
- Flavor: No Added Flavor
- Key Benefit: A concentrated, well-researched probiotic supplement
- Ideal For: Cats with digestive issues
- Formulated by experts in veterinary nutrition and microbiology
- Contains four full-spectrum probiotic strains
- Made from human-grade ingredients and tested for safety
- Hasn’t gotten a lot of customer reviews
- One of the most expensive probiotics for cats
Purina Pro Plan Veterinary Diets FortiFlora Probiotic Gastrointestinal Support Cat Supplement
Product Info
- Supplement Type: Probiotic
- Flavor: Animal Digest
- Key Benefit: An extremely palatable probiotic supplement
- Ideal For: Seniors, sick cats, cats with digestive issues
Guaranteed Analysis
Dry Matter Basis
- One of the world’s best-trusted probiotic supplements
- Has a rich, intense flavor that cats love
- Many reviewers say that it helped to ease their cats’ digestive problems
- Uses one of the world’s best-researched probiotic bacteria strains
- Low CFU count makes this one of the weaker probiotics you can use
- Among the most expensive probiotics on the market
PRO-Pets Probiotics for Dogs and Cats
Product Info
- Supplement Type: Probiotic
- Flavor: Animal Digest
- Key Benefit: A timed-release probiotic designed for better survivability
- Ideal For: Support Your Pet’s Digestive Tract
- Timed-release delivery helps to increase the probiotics’ survival rate
- Has a tasty beef flavor that cats seem to enjoy
- Receives positive customer reviews
- Uses some of the most well-researched bacteria strains
- Some cats refuse to eat the pills, even if they’re hidden in food
Jarrow Formulas Pet Dophilus Powder for Dogs & Cats
Product Info
- Supplement Type: Probiotic
- Flavor: Animal Digest
- Key Benefit: A trusted probiotic that receives positive customer reviews
- Ideal For: For cats and dogs to maintain a balanced intestinal microbial ecosystem
- Contains five of the most trusted probiotic bacteria for cats
- Receives positive customer reviews
- Synergized with inulin and metabolin
- One of the most readily available and popular probiotic supplements you can buy
- May not have a high enough CFU count for some cats with inflammatory issues or digestive problems
NOW Supplements, 8 Billion Acidophilus & Bifidus 120 Veg Capsules
Product Info
- Supplement Type: Capsule
- Flavor: None
- Key Benefit: A human-quality probiotic with generous doses of trusted strains
- Ideal For: For maintaining healthy intestine
- Made for humans, which suggests higher quality control standards
- One of the most economical probiotic supplements you can buy
- Contains three strains known to help improve cats’ health
- Hasn’t received many reviews from people giving it to their cats
NOW Supplements, Saccharomyces Boulardii,Probiotic 5 Billion CFU, 60 Veg Capsules
Product Info
- Supplement Type: Probiotic
- Flavor: None
- Key Benefit: An effective solution for cats with diarrhea
- Ideal For: For maintaining healthy intestine
- One of the most well-researched probiotics
- Ideal for cats with diarrhea
- A human-grade probiotic
- Some people may prefer a more varied probiotic supplement
Dr. Mercola Complete Probiotics Dog & Cat Supplement
Product Info
- Supplement Type: Probiotic
- Flavor: None
- Key Benefit: An extremely diverse supplement containing 14 strains of probiotic bacteria and yeast
- Ideal For: Help support your pet's gastrointestinal health and wellbeing
- A high-CFU probiotic that gives your cat a wide range of probiotic bacteria and yeast
- Easy to mix into your cat’s food
- Gets positive customer reviews
- Contains fourteen strains of probiotics, which may dilute the effect of individual strains
PetAg Bene-Bac Plus FOS & Probiotics Gel Supplement
Product Info
- Supplement Type: Probiotic
- Flavor: Animal Digest
- Key Benefit: An easy-to-administer gel ideal for sick cats and kittens
- Ideal For: Relieves intestinal stress with lactic acid producing bacteria
- Easy to administer to sick cats and kittens
- Contains several well-known, trusted probiotic strains
- One of the most well-respected products on the market
- Low CFU count
Nusentia Probiotic Miracle Premium Blend Dog & Cat Supplement
Product Info
- Supplement Type: Probiotic
- Flavor: Animal Digest
- Key Benefit: A well-respected probiotic supplement
- Ideal For: Help support proper digestive and bowel health
- Contains six types of beneficial bacteria
- Receives positive customer reviews
- Nusentia appears to be a trustworthy brand
- Doesn’t contain Enterococcus faecium bacteria
Tomlyn Pre & Probiotic Water Soluble Powder Cat Supplement
Product Info
- Supplement Type: Probiotic
- Flavor: Animal Digest
- Key Benefit: A well-balanced probiotic that comes in packets
- Ideal For: Premium formula to support wellness for dogs and cats
- Contains a variety of probiotic organisms with benefits for cats
- As a water-soluble probiotic, this powder dissolves well in water and is easy to inject with a syringe if needed
- Gets positive customer reviews
- One of the most expensive probiotic supplements you can buy
Probios Intelliflora Probiotic Cat Supplement, 30 count
Product Info
- Type: Powder in packets
- CFUs per Serving: 200 million
- Species: Enterococcus Faecium, Lactobacillus Acidophilus, Lactobacillus Plantarum, Lactobacillus Casei
- Contains Prebiotics: Yes
- Key Strengths: A flavored cat-specific supplement that’s earned the NASC Quality Seal
- Has a chicken liver flavor to increase palatability
- Contains four well-respected probiotic strains
- Synergized with inulin
- Low CFU count
- Contains sugar
VetOne Advita Probiotic Nutritional Cat Supplement, 30 count
Product Info
- Type: Powder in Packets
- CFUs per Serving: 200 million per gram
- Species: Enterococcus Faecium, Lactobacillus Acidophilus, Lactobacillus Casei, Bacillus Coagulans
- Contains Prebiotics: Yes
- Key Strengths: A flavored probiotic that contains four well-regarded strains
Guaranteed Analysis
Dry Matter Basis
- Contains supplemental vitamins and taurine for better health
- Contains poultry liver flavor for increased palatability
- Features four relatively well-known strains
- Low CFU count
DrFormulas Nexabiotic Probiotics for Cats
Product Info
- Type: Capsule
- CFUs per Serving: 17.25 billion
- Species: Contains 23 probiotics, including Saccharomyces boulardii, Lactobacillus acidophilus, Lactobacillus rhamnosus, Bifidobacterium animalis lactis, Bacillus subtilis, Streptococcus thermophilus, Enterococcus faecium
- Contains Prebiotics: Yes
- Key Strengths: A trusted probiotic with a wide array of bacteria strains
- A well-respected supplement
- Contains some of the best-known probiotic bacteria for cats
- Receives positive customer reviews
- High CFU count at the time of manufacture
- Too many probiotics at once may dilute the effects of individual strains
Vetoquinol Azodyl Kidney Health Supplement for Dogs & Cats
Product Info
- Type: Capsule
- CFUs per Serving: 15 billion per capsule
- Species: Streptococcus thermophilus, Lactobacillus acidophilus, and Bifidobacterium longum
- Contains Prebiotics: Yes
- Key Strengths: Intended for cats with kidney disease
- Has earned the NASC quality seal
- Some people say that this supplement helped their cats feel better with kidney disease
- Very expensive
PetUltimates Probiotics for Cats
Product Info
- Type: Powder
- CFUs per Serving: 5 billion
- Species: Lactobacillus acidophilus, Lactobacillus brevis, Lactobacillus casei...
- Contains Prebiotics: Yes
- Key Strengths: A high-diversity probiotic for those who want to give their cat a wide array of strains
- Provides a wide variety of probiotic bacteria
- One of the most popular probiotic supplements on the market
- Synergized with prebiotic fiber
- Made in the United States in a GMP-certified facility
- Such a wide variety of bacteria may dilute the effect of individual strains
Fera Pet Organics Probiotics with Organic Prebiotics for Dogs & Cats, 72-g
Product Info
- Type: Powder
- CFUs per Serving: 5 billion
- Species: Lactobacillus acidophilus, Lactobacillus casei, Saccharomyces boulardii, Lactobacillus plantarum, Bifidobacterium infantis, Lactobacillus bulgaricus, Bifidobacterium bifidum, Bifidobacterium longum, Enterococcus faecium, Lactobacillus brevis, Lactobacillus rhamnosus, Streptococcus thermophilus
- Contains Prebiotics: Yes
- Key Strengths: A USDA-certified organic probiotic supplement
Guaranteed Analysis
Dry Matter Basis
- Contains a variety of well-known probiotic strains
- USDA certified organic
- Synergized with the prebiotic FOS and inulin
- Receives positive customer reviews
- A moderately-priced product
- None
VetriScience Vetri-Mega Probiotic Digestive Health Dog & Cat Capsules
Product Info
- Type: Capsule
- CFUs per Serving: 2.5 billion
- Species: Lactobacillus Acidophilus, Lactobacillus Plantarum, Lactobacillus Casei, Lactobacillus Brevis, Bifidobacterium Bifidum, Bifidobacterium Longum, Enterococcus Thermophilus
- Contains Prebiotics: Yes
- Key Strengths: A multi-purpose probiotic that works as well for dogs as it does cats
- Each capsule contains 2.5 billion CFUs of 8 well-known probiotic strains
- One of the best-rated products on the market
- Synergized with prebiotic fiber
- Comes in large capsules
Rx Vitamins Rx Biotic Probiotic Dogs & Cat Supplement
Product Info
- Type: Powder
- CFUs per Serving: 2 billion
- Species: Lactobacillus acidophilus, Bifidobacterium longum, Bifidobacterium bifidum, Bifidobacterium Lactis
- Contains Prebiotics: Yes
- Key Strengths: A straightforward probiotic supplement approved by the NASC
- Veterinarian-formulated and approved by the NASC
- Contains prebiotics, which help the probiotic bacteria flourish
- Receives almost universally positive customer reviews
- Doesn’t contain Enterococcus faecium, one of the best-known probiotics for cats
Only Natural Pet Complete Gut Health Probiotic & Enzyme Digestive Powder Dog & Cat Supplement
Product Info
- Type: Powder
- CFUs per Serving: 1.92 billion
- Species: Aspergillus Oryzae, Bifidobacterium Longum, Lactobacillus Plantarum, Bifidobacterium Animalis, Lactobacillus Acidophilus
- Contains Prebiotics: Yes
- Key Strengths: A total digestive health blend of enzymes and probiotics
- Contains a variety of supplements for digestive health
- Made in an FDA-approved facility
- Uses well-known probiotic bacteria
- Some reviewers say that their cats refused to take this supplement
Wholistic Pet Organics Digest-All Plus Dog & Cat Supplement
Product Info
- Type: Powder
- CFUs per Serving: 5 billion
- Species: Bacillus subtilis, Lactobacillus acidophilus, Bifidobacterium longum
- Contains Prebiotics: Yes
- Key Strengths: A NASC-certified mix of probiotics and digestive enzymes
- Contains a mix of digestive enzymes, probiotics, and prebiotics for digestive health
- Receives positive customer reviews
- Has earned the NASC quality seal
- Doesn’t contain Enterococcus faecium, one of the best-known beneficial bacteria species for cats
Alyce
You mentioned that human probiotics are safe for cats when many vets will not recommend human probiotics, including my own vet. "Can cats take probiotics made for humans? “No, cats should take probiotics made for cats,” says Dr. Eldredge. “The intestinal flora varies with each species, so bacteria that are ideal for people may not help cats at all (may not hurt but may not help). Some people eat live culture yogurt to get healthy bacteria, but many cats don’t handle dairy products very well. You could make things worse.” Stick to probiotics formulated specifically for cats." "Can I Give my Cat Human Probiotics? While there are no current studies that point to the fact that giving cats a probiotic supplement designed for humans is dangerous, veterinarians still urge pet parents to opt for a product that is specially designed for cats. “The microflora in a cat's small and large intestine are different than for people, so we can't assume that human probiotics will work in cats,” say Deirdre Frey, VMD with Vet at Your Door, a Portland, Maine-based veterinary home-care practice." "Are Human Probiotics Safe for Cats? Many people have experienced the benefits of probiotics for themselves and want their cats to benefit, too. You can’t give the same probiotics you’re taking to your cat, however. “An over-the-counter supplement recommended for human use that a pet owner considers giving to their dog or cat would concern me,” says Dr. Cross. “I only recommend probiotics that have been shown to be safe for dogs and cats and have a positive health effect.”
Kate Barrington
Hey Alyce, we appreciate your comment and the time you've put into your research! We always recommend taking your vet's advice because they know your cat best. You're right that there isn't sufficient evidence suggesting that human probiotics are harmful for cats, but the main question is whether they are effective. We'll do some more research into this and update the article if we find new information!