Vitamin A is vital for your cat's vision, immune system, skin integrity, and growth — but here is the critical difference between cats and most other animals: cats cannot convert beta-carotene (the orange pigment in carrots and sweet potatoes) into usable vitamin A. While dogs, rabbits, and humans easily perform this conversion, cats lack the intestinal enzyme beta-carotene dioxygenase needed to split beta-carotene into retinol. This means your cat must consume preformed vitamin A (retinol), which is found exclusively in animal tissues — particularly liver, egg yolks, fish oils, and dairy. No amount of carrots or pumpkin will provide your cat with vitamin A. This metabolic limitation is another hallmark of obligate carnivore biology. Vitamin A maintains the health of epithelial tissues (skin, cornea, respiratory lining, digestive tract), supports night vision and overall eye health, drives proper immune cell function, and is essential for fetal development during pregnancy. It is a fat-soluble vitamin, meaning it is stored in the liver and can accumulate to toxic levels if over-supplemented.
A small piece of chicken liver the size of your thumbnail (about 10g) provides roughly 3,000–4,000 IU of vitamin A — your adult cat needs approximately 200–1,000 IU per day, so liver should be an occasional treat rather than a daily staple. Commercial cat foods provide appropriate levels of preformed vitamin A. Remember, plant sources like carrots provide zero usable vitamin A for cats, so animal-based sources are the only option.
0.0% of daily nutrient intake
Vitamin A makes up 0.0% of your cat's total daily nutritional requirements by weight. That's a tiny amount — but it matters.
Night blindness progressing to more severe vision problems, dry and flaky skin, poor coat quality, increased susceptibility to respiratory and skin infections, stunted growth in kittens, and reproductive problems in breeding cats. Because the liver stores vitamin A, deficiency typically takes weeks to months to develop even on a completely deficient diet.
Vitamin A toxicity (hypervitaminosis A) is a well-documented condition in cats, most commonly seen in cats fed excessive amounts of raw liver over long periods. Symptoms include cervical spondylosis (bony growths along the spine and neck that cause stiffness and pain), reluctance to groom or move the head and neck, joint pain, lethargy, and in severe cases, liver damage. Do not supplement vitamin A beyond what is in a balanced commercial diet without veterinary guidance.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | — | 200 | 1000 | IU | Adult cats need preformed retinol from animal sources. Liver is the richest source but should be fed sparingly to avoid toxicity. |
| Juvenile | — | 200 | 800 | IU | Growing kittens need preformed vitamin A (retinol) for vision, immune, and tissue development. Cannot use beta-carotene from plants. |
| Pregnant / Nursing | — | 400 | 1500 | IU | Pregnant queens need higher vitamin A for fetal development, but excess can cause birth defects. Stay within recommended ranges. |
| Senior | — | 200 | 800 | IU | Senior cats maintain similar vitamin A needs. Excess supplementation should be avoided, especially in cats with liver issues. |
Source: NRC 2006, AAFCO 2024
Vitamin A is fat-soluble and requires dietary fat for proper absorption from the intestines. A very low-fat diet impairs vitamin A uptake regardless of how much retinol is present in the food.
What this means: Always serve vitamin A-rich foods (liver, egg yolk) with some dietary fat to ensure absorption. This is naturally the case with whole animal foods, but matters if you are adding purified supplements to a very lean diet.
