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Our favorite cat supplement is The Missing Link The Original Superfood Supplement for Cats, which blends healthy fats, phytonutrients, and dietary fiber in an easily delivered powder form. For older cats, check out VetriScience Laboratories Nu Cat Senior MultiVitamin.
While felines, including house cats, are carnivores, their diets can include grains and veggies, which are a good source of vitamins, minerals, and fiber. Especially for cats fed a raw diet, supplementation can ensure that they're getting the appropriate micronutrients in addition to protein.
We recommend checking with a vet before introducing anything new to your cat's diet, especially since some dietary supplements for pets make exaggerated claims about their efficacy. We evaluated dozens of products for transparent ingredients and useful dietary supplements, including amino acids, digestive enzymes, and omega-3s for their skin, coat, and joints.
Here are the best cat supplements.
Best Overall: The Missing Link The Original Superfood Supplement for Cats Powder Formula
The Original Superfood Supplement is an all-natural powdered formula. It has omega-3 and omega-6 fatty acids for healthy skin and fur, dietary fiber for digestion, and phytonutrients, which can help with inflammation.
This cat supplement contains ingredients flaxseed, beef liver, dried kelp, barley grass, and alfalfa meal for a well-rounded dose of protein, fat, fibrous carbs, vitamins, and minerals. The cold-pressed powder can be sprinkled onto your cat's kibble or wet food.
Best for Joints: Nutramax Professional Line Cosequin Joint Health Supplement for Cats
If your feline has arthritis or other joint issues, we recommend Nutramax Cosequin. This supplement contains a blend of glucosamine, manganese, and chondroitin sulfate, which help produce cartilage and protect bones. It might be just what your pet needs to pounce, jump, and play like they're still a kitten.
Depending on your cat's weight, you can sprinkle one or two capsules onto their food once a day for about a month and then every other day for maintenance. Aside from joint support, Cosequin might also help with bladder health in cats.
Best for Skin and Coat: Zesty Paws Core Elements Wild Alaskan Salmon Oil for Dogs & Cats
As the name suggests, Zesty Paws Salmon Oil contains wild Alaskan salmon oil, which is rich in Omega-3 fatty acids, plus Vitamin E. Just one pump on your cat's food every day can help keep their skin and coat healthy, soft, and shiny.
Omega-3s from EPA and DHA (found in fish like salmon) can also lubricate your cat's joints, support immune function, and benefit heart health. Vitamin E helps condition the skin and promotes more lustrous hair growth. Best of all, cats purr with delight over the fishy flavor.
Best for Seniors: VetriScience Laboratories Nu Cat Senior MultiVitamin
Cats may have "nine lives," but that doesn't mean they're invincible. When your four-legged friend reaches old age (around 11 years), you might start noticing issues relating to vision, mobility, and respiratory health. Nu Cat Senior is a multivitamin and mineral formulated to support whole-body health in senior house cats.
One pack comes with 30 bite-sized chews in a tasty fish flavor your pet will pounce on. Ingredients like salmon oil, safflower oil, taurine, lysine, oat flour, and rye flour provide healthy fats, whole-grain fiber, and amino acids. This supplement also contains several vitamins and minerals like calcium, vitamin D, magnesium, zinc, Vitamin B12, Vitamin A, folic acid, and biotin. It's also got brewer's yeast, which can help repel fleas.
Best for Immune Support: Pet Naturals L-Lysine Chews for Cats
The best cat supplement for immune support is Pet Naturals L-Lysine. Your feline will appreciate that these appetizing chews are naturally flavored with chicken liver. As the name implies, they contain l-lysine, an amino acid often given to cats to fend off infections.
Other ingredients include oat, barley, and rye flour, brewer's yeast, and calcium. Offering your cat one chew a day might help with immunity and respiratory health, but be sure to check with your veterinarian before supplementing their diet.
Best for Digestion: Purina Pro Plan Veterinary Supplements FortiFlora for Cats
If your pet is struggling with digestive issues, you might try Purina Pro Plan FortiFlora. This powdered probiotic is specially formulated to alleviate diarrhea in cats. The probiotics come from dried "enterococcus faecium fermentation," which is a fancy way to say good bacteria that benefits gut health and digestion.
Other ingredients include brewer's yeast, vitamin C, zinc, manganese, calcium, and taurine. One box comes with 30 pre-portioned packets containing live microorganisms (probiotics), which you can sprinkle over your cat's food once a day.
If you're looking for a high-quality supplement that supports whole-body health, your best bet is The Missing Link The Original Superfood Supplement for Cats. The all-natural powdered formula is chock full of healthy fats, phytonutrients, and dietary fiber. That said, if you have a senior cat at home, you might want to select something formulated specifically for older felines, like VetriScience Laboratories Nu Cat Senior MultiVitamin, which has essential amino acids and omega-3s, plus a blend of vitamins and minerals.
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This article was written by Theresa Holland, a professional writer, animal lover, and former pet owner with extensive experience covering cat and dog products. You can read more of her work on The Spruce, MyDomaine, and Byrdie.