Omega-3 fatty acids — particularly EPA and DHA found in marine sources — have well-documented anti-inflammatory effects that calm irritated, flaky skin from the inside out. Omega-6 fatty acids, especially linoleic acid, are structural components of the skin barrier itself, helping to lock moisture in and keep irritants out. When either is deficient, the barrier weakens and transepidermal water loss increases, resulting in dry, flaky skin.

Look for foods where a named fish (salmon, sardine, herring, mackerel) appears in the first few ingredients, or where fish oil is listed as a supplemental fat source. Plant-based ALA from flaxseed is less effective for cats, as felines have a very limited ability to convert ALA to EPA and DHA.

Cats are obligate carnivores — they rely on animal-source amino acids for virtually every physiological process, including skin and coat maintenance. The amino acids methionine and cysteine are direct precursors to keratin, the structural protein that makes up fur and the outer skin layer. Taurine deficiency, while more commonly associated with cardiac issues, also contributes to poor coat quality.

Look for foods with a named animal protein (chicken, turkey, salmon, duck) as the very first ingredient. Foods listing “meat by-product meal” as the primary protein without specifying the species are a lower-quality choice for skin health.

Vitamin E (alpha-tocopherol) is a fat-soluble antioxidant that protects skin cell membranes from oxidative damage caused by UV light, environmental pollutants, and normal metabolic processes. It also helps maintain the lipid layer of the skin, supporting moisture retention. Cats fed diets high in polyunsaturated fatty acids (like fish-rich diets) have higher vitamin E requirements, since E is needed to protect those fatty acids from peroxidation.

Most quality commercial cat foods are fortified with vitamin E. If you’re supplementing fish oil independently, ensure your cat’s food still provides adequate vitamin E to compensate for the increased oxidative load.

Zinc is essential for over 300 enzymatic reactions in the body, many of which are directly involved in skin cell turnover and repair. It plays a key role in sebaceous gland function — the glands responsible for producing the natural oils that keep skin supple and coat glossy. Zinc deficiency leads to a condition called zinc-responsive dermatosis, characterized by scaling, hair loss, and crusting. Most balanced commercial cat foods contain adequate zinc, but cats fed homemade diets without careful formulation are at higher risk of deficiency.

Important: Do not supplement zinc without veterinary guidance. Both deficiency and excess are harmful — zinc toxicity in cats is a medical emergency.

Cats evolved as desert animals with a naturally low thirst drive — they were designed to get most of their water from prey. This means cats fed exclusively on dry kibble (which contains only 8–10% moisture) are chronically mildly dehydrated compared to cats eating wet food (which contains 70–80% moisture). Even mild dehydration reduces skin elasticity and the skin’s ability to maintain its barrier, contributing to dryness and flaking.

Switching partially or fully to wet food is often one of the fastest improvements owners see. Cats also tend to drink more from running water — a cat fountain can meaningfully increase voluntary water intake.