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Cat Nutrition5 min read2026-10-06

Vitamin C in Cats: Deficiency and Excess

Vitamin C, one of the organic compounds necessary for sustaining life, is naturally found in some foods. Citrus fruits, broccoli, blueberries, red peppers, and dark green leafy vegetables are very rich in vitamin C. Just like humans, cats need vitamins to be healthy. One of them is vitamin C.

Written byBurak
Vitamin C in Cats: Deficiency and Excess
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Vitamin C, one of the organic compounds necessary for sustaining life, is naturally found in some foods. Citrus fruits, broccoli, blueberries, red peppers, and dark green leafy vegetables are very rich in vitamin C. Just like humans, cats need vitamins to be healthy. One of them is vitamin C. Also known as ascorbic acid or ascorbate, vitamin C plays an important role in tissue repair.

Orange-furred cat lying on the floor

What is Vitamin C?

Vitamin C is a water-soluble vitamin. Unlike humans, some animals can synthesize vitamin C, therefore requiring less external intake. Cats can synthesize vitamin C in their livers. Vitamin C has important physiological functions in cats. It plays a significant role in tissue growth and health, improving oxidative stress, and regulating the immune system. In some critically ill cases, vitamin C supplementation reduces the severity of the disease and increases the chances of survival. Furthermore, the use of vitamin C intravenously in life-threatening conditions such as septic shock has been shown to yield beneficial results. Although information on the use of vitamin C in animals is still limited, it is among the vitamins most frequently used, especially in cats and dogs, due to its low risk of side effects, ease of production, and the benefits it provides.

Different Forms of Vitamin C

Vitamin C has different forms, and therefore its use in cats can also vary. These forms have different properties.

Ascorbic Acid: The natural form of vitamin C.

Ascorbyl Palmitate: The fat-soluble form of vitamin C. This property allows it to work more effectively with other antioxidants.

Calcium Ascorbate: The most useful form of vitamin C, especially for those with sensitive stomachs. Calcium ascorbate is easily absorbed anywhere in the intestinal tract of most mammals.

Ester C Calcium Ascorbate: Ester C Calcium Ascorbate, a non-acidic form of vitamin C, has a neutral pH and therefore does not cause stomach discomfort. It is produced by mixing calcium, ascorbate, and metabolites.

Sodium Ascorbate: Sodium ascorbate is also a type of vitamin C that is easily absorbed by the body. Furthermore, because it is in an acidic form, it remains in the body twice as long.

According to research, sodium ascorbate is the most effective option for vitamin C in terms of cost, bioavailability, and effectiveness.

Gray cat standing next to a fruit bowl

What are the Benefits of Vitamin C for Cats?

A comprehensive answer is needed to the question "What is the function of vitamin C in cats?" because vitamin C is quite important for cats. Vitamin C is especially used in the production of two important amino acids called proline and lysine, which enable collagen production. Collagen ensures that bones, teeth, and connective tissues in the body are healthy and strong. It also makes a significant contribution to the growth and development of the skeleton. Vitamin C supplementation in cats significantly reduces the risk of dysplasia, spinal problems, or degenerative joint disease. Like humans, cats also suffer from various allergies. Vitamin C acts as an antihistamine, a compound that counteracts histamine and fights inflammation, thus alleviating allergy symptoms. It is also an effective antioxidant. It is essential for cats to have healthy, shiny fur. It is used in conjunction with vitamin E for a healthy coat. Vitamin C is a natural immune system booster. When absorbed by the body, it increases the number of antibodies that fight toxins, bacteria, and viruses. Therefore, vitamin C deficiency in cats causes illnesses to take longer to heal. Interferon levels, which fight cancer and viral infections, increase with vitamin C. Another important property of vitamin C is that when consumed in the correct amount, it also increases the absorption rate of other nutrients consumed with it.

Just like humans, cats also have various allergies. Vitamin C acts as an antihistamine, a compound that counteracts histamine and fights inflammation, thus alleviating allergy symptoms. It is also an effective antioxidant. It is essential for cats to have healthy and shiny fur. Used in conjunction with Vitamin E for a healthy coat.

Vitamin C is a natural immune system booster. When absorbed by the body, it increases the number of antibodies that fight toxins, bacteria, and viruses. Therefore, Vitamin C deficiency in cats causes illness to take longer to heal. Interferon levels, which fight cancer and viral infections, increase with Vitamin C. Another important feature of Vitamin C is that when consumed in the right amount, it increases the absorption rate of other nutrients consumed with it.

Yellow-furred cat reaching for vitamin supplements

How Much Vitamin C Do Cats Need?

When it comes to vitamin C for humans, the general belief is that it will at best be beneficial and at worst harmless. Vitamin C is also relatively harmless for cats. While the answer to the question "Can you give vitamin C to cats?" is yes, the important thing is the amount of vitamin C given. Giving too much vitamin C to cats can cause diarrhea. Also, the daily amount of vitamin C needed varies depending on the cat's weight. Therefore, dosage adjustment should be done in consultation with a veterinarian. Generally, 25mg of vitamin C per day is considered sufficient for cats. Since cats can synthesize vitamin C, food manufacturers usually do not add vitamin C to the food content or add it in very small amounts. Therefore, supplemental vitamin C can be given to cats. You can review vitamins and supplements formulated for cats by clicking here.

However, when cats are stressed, sick, or tired, their bodies use vitamin C for recovery. This leads to a decrease in the body's reserves. To normalize vitamin levels in the body, veterinarians may recommend vitamin supplements.

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