Quercetin - Alternative Medicine for Dogs and Cats - Benefits, Interactions, Dosage

Quercetin for dogs and cats, a natural antihistamine
★ 3 min read
In this article:

1. About Quercetin
2. Health Benefits
3. Cautions
4. Side Effects
5. Drug Interactions
6. Administration and Dosage

1.0 About Quercetin

What is Quercetin

Quercetin sometimes called nature’s Benadryl, is a naturally occurring flavonoid found in many plants. Flavonoids (or bioflavonoids) are plant-pigments that play an essential role in attracting pollinators to plants. Flavonoids also offer a host of beneficial properties to humans, dogs, cats and other animals. Quercetin is:
  • Anti-allergenic
  • Anti-carcinogenic
  • Anti-fungal
  • Anti-Inflammatory
  • Anti-microbial
  • Anti-viral

Quercetin rich foods and herbs for dogs
Examples of fruit, vegetables and herbs naturally rich in quercetin
  • Apples (fresh)
  • Berries
  • Bananas
  • Broccoli
  • Cherries (dark)
  • Garlic (fresh)
  • Grapefruit (particularly white grapefruit) and grapefruit seed extract
  • Green tea
  • Ginkgo biloba
  • Chamomile tea
  • Parsley
  • Summer squash
  • St. John’s Wort

Quercetin is Available In Supplemental Form
  • Capsules
  • Drops
  • Pills
  • Powder
As quercetin can sometimes be difficult for the body to assimilate, taking Bromelain (pineapple derived digestive enzyme) with quercetin can add absorption.
  • Bromelain also works to inhibit histamine
  • The ratio is: ¼ to 1/3 the amount of bromelain to quercetin

2.0 Health Benefits of Quercetin

A partial list:
  • Anti-allergenic
    • Asthma (an inflammatory disease)
      • Quercetin minimizes the degree of constriction that occurs as it moderates the constriction of bronchial tubes
    • Environmental allergies
      • Dust and dust mites
      • Chemical-based cleaning products
      • Insect bites
      • Insect and parasite preventatives  - chemical based
      • Grass and wild flower (weed) pollen
      • Trees and tree pollen
      • Mold , mushroom, fungus spores
    • Food Allergies
    • Quercetin’s anti-histamine, anti-inflammatory, anti-oxidant properties work together to turn-off histamine production and suppress or reduce inflammation and itching
  • Anti-Inflammatory
  • Atherosclerosis - hardening of the arteries, (an inflammatory disease)
  • Blood Conditions
  • Cataracts
  • Cancer prevention
    • Breast cancer
    • Colon cancer
    • Endometrial cancer
    • Mast cell
    • Ovarian cancer
    • Prostate cancer
  • Chronic fatigue syndrome
  • Diabetes
  • Heart conditions and heart disease
  • Inflammation
  • Prostate pain and inflammation
  • Vascular (circulation) issues
  • Viral infections

3.0 Cautions

  • Very high doses can cause kidney damage
  • Never exceed the daily recommended dose.
  • DO not give Quercetin to dog and cats with kidney disease
  • Do not give to pregnant or lactating dogs and cats

4.0 Side Effects

In some individuals can cause tingling in the limbs.

5.0 Drug Interactions

  • Some antibiotics for example:
  • Cyclosporin
  • Medications changed by the liver
  • Medications moved by pumps in cells

6.0 Quercetin Administration and Dosage


  • Quercetin can be administered for up to 12 consecutive weeks at a time, after which you must take a break from use.
  • Only use Quercetin for as long as absolutely required, you should not keep your dog or cat permanently on Quercetin

Dosage by Body weight

  • Dog’s or Cat’s body weight (lbs) x 1000mg
  • Divide the resulting number by 125
  • The resulting number will be the mg daily dosage required
  • Then split the daily dosage in half
  • Administer the half dosage two times a day with food
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Article and graphics by Karen Rosenfeld


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