5 Effective Immune Boosters for Cats You Must Know

Geriatric cat with low immune system

People choose immune boosters for cats for several different reasons.

Many kittens suffer from weak immune systems at birth, leaving them sickly and prone to diseases.

Older cats, on the other hand, suffer immune problems as the normal functioning of their immune system declines with age.

Sometimes pet parents choose cat immune boosters to be proactive. They want to prevent health problems before they occur.

The following immune boosters for cats can help young and old alike, helping weak cats fight off infections like cats with more robust immune systems.

And, giving healthy cats an even better edge on life.

Our 5 Favorite Immune Boosters for Cats

The immune system protects your cat’s body from outside invaders.

Outside invaders include germs such as bacteria, viruses, fungi, and toxins.

Your cat’s immune system consists of different organs, cells, and proteins that work together to destroy outside invaders.

If your cat’s immune system isn’t functioning at total capacity, cat immune boosters help even the odds.


1. Sodium Ascorbate Vitamin C

Sodium ascorbate vitamin C is the easiest cat immune booster to obtain and use.

It is an over-the-counter form of Vitamin C which boosts the immune system and provides antihistamine and anti-inflammatory effects.

Elevated vitamin C levels aid immune system regeneration, simultaneously destroying bacteria and viruses.

You must use the sodium ascorbate form of vitamin C. Do not use Ascorbic Acid, the most common form of vitamin C.

Sodium Ascorbate is neutral pH, so it does not cause gastrointestinal distress as ascorbic acid does in higher doses. (Ascorbic Acid is not recommended due to its acidic pH.)

The standard supplement dosage for adult cats is 1/8 (500 mg) twice daily in food.

For kittens and cats under 7 lbs, start at 1/16 tsp (250mg) twice daily food. 

It’s usually challenging to find the sodium ascorbate form of vitamin C in the drugstore, so we recommend purchasing it online.

For large pets, the 2.2 lb size is the better deal, for small pets (under 25 lbs), the 8 oz. or 16 oz. should last a couple of months. 

Sodium ascorbate also helps cats suffering from constipation. If your cat is still constipated on 1/8 teaspoon, try upping the dose to 1/4 teaspoon to loosen the stool.

How to Titrate to Bowel Tolerance

“Titrating to bowel tolerance” is the best way to find the exact dose of sodium ascorbate for your cat. 

Titrating to bowel tolerance simply means starting at a low dose and gradually increasing the dose until your pet develops loose stools. 

Once your pet’s stool becomes loose, drop back to the dose you gave just before the loose stool. This is your pet’s “bowel tolerance.” 

For tiny puppies and kittens, we recommend starting at 1/16 of a teaspoon sprinkled in food twice daily and increasing by 1/16 teaspoon per day until bowel tolerance is reached.

For pets under 25 lbs, we recommend starting at 1/8 of a teaspoon sprinkled in food twice daily and increasing by 1/8 teaspoon per day until bowel tolerance is reached.

For pets over 25 lbs, we recommend starting at 1/4 of a teaspoon twice daily and increasing by 1/4 teaspoon per day until bowel tolerance is reached.

Don’t worry, vitamin C is water-soluble. In other words, whatever your pet doesn’t need is excreted, hence the loose bowels when discovering your pet’s tolerance.

If your pet has loose stools more than two days in a row at any time, reduce the dose by one increment.

After you’ve reached your pet’s bowel tolerance, once every week or two, try upping the dose by one increment to see if your pet needs a little more vitamin C.

Stay at the higher dose if your pet does not develop loose stools.

If your pet develops loose stools, simply return to the regular dose. 

2. Acemannan

Acemannan is an immunomodulatory polysaccharide extracted from the popular healing herb Aloe Vera.

Years ago, the FDA approved injectable Acemannan for treating Fibrosarcomas and Feline Leukemia Virus (FeLV). But since injectable Acemannan is no longer available, the oral variety is your only choice.

Our clinic uses the following protocol:

Loading dose: 1 teaspoonful of oral Acemannan daily for 5 days

Maintenance dose: 1/2 teaspoon daily for 4-5 weeks.

If you see an improvement in your pet, continue at a rate of 1/2 teaspoon daily.

You can buy Acemannan online and without a prescription.

3. Lysine

Lysine is an over-the-counter amino acid supplement recommended for cats suffering FIV, upper respiratory infections, conjunctivitis, sneezing, and herpes virus.

It’s available as a gel, pill, flavored powder, or treat.

“Human” lysine brands come in tablet and capsule form.

But we’ve found mixing Lysine powder into canned food the most efficient feeding method.

The recommended Lysine dosage is:

500 mg per day, given twice daily for adult cats

250 mg per day, given twice daily for kittens

You can buy lysine online without a prescription.

4. Frankincense Essential Oil

Frankincense essential oil is an amazing immune booster in cats.

Cats are very sensitive to essential oils, so you must adhere to basic safety principles.

To use essential oils on your cat in a safe manner, make sure the oils are pure, unadulterated oils.

Our first choice of essential oil providers is doTERRA.

To use Frankincense on your cat, simple follow these steps:

  1. Place just 1-2 drops of undiluted Frankincense essential oil in your hand.
  2. Then, rub your hands together, allowing your palms to absorb most of the essential oil.
  3. Finally, stroke your cat’s body.

If you smell the essential oil on your cat’s fur, it’s working!

5. Lymphocyte T-Cell Immunomodulator (LTCI)

Lymphocyte T-Cell Immunomodulator (LTCI) enhances the immune system of cats suffering from Feline Leukemia Virus and Feline Immunodeficiency Virus (FeLV & FIV).

LTCI is a natural protein product and a USDA-approved treatment for cat viral diseases. This treatment requires a series of painless injections. But, rest assured it will boost your kitty’s immune system.

Learn more about the advantages of Lymphocyte T-Cell Immunomodulator.

Pairing Cat Immune Boosters with An Energetically Appropriate Diet

Immune boosters for cats are essential. 

However, cat immune boosters with an energetically appropriate diet will dramatically boost your cat’s immune system.

Sometimes, home-cooked diets provide the best nutrients to strengthen your cat’s immune system.

So, if you want to learn how choose an energetically appropriate diet and cook for your cat, visit the recipe page at PET | TAO Holistic Pet Products.

Or if you’d like a health makeover for your cat, contact our clinic today

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