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Dr. Jones' Extra Strength Ultimate BioActive Quercetin for Dogs and Cats (150mg, 30 Capsules)

Dr. Jones' Extra Strength Ultimate BioActive Quercetin is a powerful antioxidant with antihistamine, anti-inflammatory, and antiviral properties. The supplement contains naturally sourced Sophora Japonica flower extract, in capsule form (powder in capsules), and is generally more bio-available than other quercetin forms. Each Extra Strength capsule contains 150mg quercetin, with 30 capsules per jar.

Extra Strength version is Recommended for Medium to Large Dogs Only.

For cats and smaller dogs, you can find our regular strength (50mg) capsules here.

Save 10% (or more) with our optional auto-ship plan! Simply choose your renewal schedule from the 'Subscription type' drop-down box below. You can cancel or change your plan to a different schedule at any time from your Customer Account or by contacting support.

For no auto-ship, leave as 'No subscription'.

Subscription type:

First Period Price: $29.67

Ongoing subscription pricing:

  • Buy 2 for $29.67 each and save 10%
  • Buy 3 for $26.97 each and save 18%
  • Buy 6 for $23.97 each and save 27%


    Dr. Jones' Extra Strength Ultimate BioActive Quercetin for Dogs and Cats

    Dr. Jones' Extra Strength Ultimate BioActive Quercetin is Non-GMO and gluten free, and contains no wheat, corn, soy, or any artificial colors, flavors, or preservatives.

    The supplement is in capsule form (powder in capsules), containing 150mg Quercetin per capsule, with 30 capsules per jar.

    Dosage recommendations:

    • Dogs 30 - 45lbs: 1 capsule daily
    • Dogs 45 - 60lbs: 1 and 1/2 capsules daily
    • Dogs 60 - 90lbs: 2 capsules daily
    • Dogs over 90lbs: 3 capsules daily

    Quercetin is a powerful antioxidant with antihistamine (anti-allergy), neuroprotective, cardioprotective, antimicrobial/antiviral, antioxidant, and anti-inflammatory properties. Quercetin is a flavanol, from the flavonoid family, which are compounds found naturally in fruits and vegetables. Dr. Jones' Ultimate BioActive Quercetin contains naturally sourced Sophora Japonica flower extract, which is generally more bio-available than other quercetin forms.

    As an antioxidant, quercetin is 50 times more powerful than vitamin E and 20 times more powerful than vitamin C.

    Dr. Jones' Ultimate BioActive Quercetin can help your pet in the following ways:


    • Reduces allergy symptoms – quercetin is a very effective antihistamine (restricts histamine from being released from cells)
    • Studies show quercetin is just as effective as conventions drugs, with NONE of the side effects as seen with pharmaceuticals
    • Has been used in Chinese medicine for centuries for allergy help

    Heart disease

    • Improves blood flow
    • Reduces risk of heart disease and stroke


    • May reduce the risk of cancer
    • Combats free radicals, reduces oxidative stress which can inhibit cancer cell growth
    • Shown to have the ability to destroy cancerous cells

    Arthritis / Joint Health

    • With anti-inflammatory properties, quercetin can help relieve pain associated with arthritis


    • Has significant anti-diabetic effects and may be helpful in lowering blood sugar and increasing insulin sensitivity

    Eye Health

    • Cataracts - can enhance vision, promote clarity of the lens and help prevent cataracts

    Brain health

    • Is anti-inflammatory and an antioxidant – neuroprotective
    • May reduce the risk of neurodegenerative diseases (Alzheimer's, cognitive decline)
    • Studies have found diets high in quercetin show noticeably reduced markers of Alzheimer's disease, and improved cognitive function

    Antibacterial and antiviral

    • Can inhibit the growth of bad bacteria
    • May protect against viral infections

    For more detailed information on the ingredients click the Ingredients tab.

    Looking to save money? Order on our Auto-ship plan (on a 1, 2 or 3 month schedule) and save 10% - choose your plan term under 'Subscription type'.



    Buy 10 jars of Ultimate Canine Advanced and get 1 FREE!

    Starting with your first order, we'll automatically add you to our Ultimate Rewards Program. Whether you are on an auto-ship program or not, we'll keep track of your orders and send updates, and on your 10th order, we'll AUTOMATICALLY ship you a FREE jar! (Free jar will be included with your shipment when you reach your 10th jar). See more about it here.


    Dr. Jones' Extra Strength Ultimate BioActive Quercetin for Dogs and Cats Ingredients

    Ingredients (per capsule)

    Bioactive Quercetin (Sophora Japonica Extract (flower)) 150mg

    Other / Inactive ingredients:    Rice flour, Silicon dioxide, Magnesium stearate

    The bottle contains 30 capsules in total.

    1. "EXTRA" strength?!
      Review by Sara


      i think this is probably a great product, it seems to help, but i simply cant afford enough of it! It's supposed to be extra strength for medium to large dogs - my dog is medium - 65 lbs so he needs 2 capsules a day which means i have to buy 2 bottles per month! Can't imagine the cost if i had a LARGE dog!
      (Posted on 7/8/2024)

    2. My dog skin allergies are gone
      Review by Alma


      I can't express how grateful I am for discovering Dr. Jone's Quercetin supplement. My dog has been struggling with skin allergies since we adopted her (almost 4 years ago), and it used to be a constant battle. Before we started using this supplement, we had to take her to the vet every three months for an allergy shot. My poor furry baby was very uncomfortable, and it was heartbreaking to see her in that condition. That's when I decided to take a different approach and found this product.

      Since we started giving her the Quercentin, the change has been nothing short of miraculous. She only needed one more shot six months after starting the supplement, and the last shot was over a year ago. Now, she doesn't need the shots anymore!

      Her skin is healthier than ever, and she's so much happier and more comfortable. This supplement has truly transformed her quality of life, and I couldn't be happier with the results. If your dog is struggling with skin allergies, I highly recommend giving Dr. Jone's Quercetin a try. It has made a world of difference for us, and I hope it can do the same for you and your furry friend.
      (Posted on 6/19/2024)

    3. Itchy
      Review by Terrylynn


      I tried her on it, but I wasn’t sure if it was helping or not so I stopped.. I noticed after I stop, she started licking and biting at her paws. I bought some more I have found that it’s a lot less her chewing inviting at her paws. To buy only 30 capsules, for my dog really isn’t good because she uses one and a half capsules. It would be nice if they came in bigger bottles that the bottle would at least last a month..
      (Posted on 1/27/2024)

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