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Dr. Jones' Ultimate BioActive Quercetin for Dogs and Cats (50mg, 30 Capsules)

Dr. Jones' 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 capsule contains 50mg quercetin, with 30 capsules per jar.

The regular (50mg) capsules are recommended for cats and smaller dogs (up to 30lbs). For medium and large breed dogs, choose our New Extra Strength Version 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: $14.97

Ongoing subscription pricing:

  • Buy 2 for $14.97 each and save 12%
  • Buy 3 for $13.47 each and save 21%
  • Buy 6 for $11.97 each and save 29%


    Dr. Jones' Ultimate BioActive Quercetin for Dogs and Cats

    Dr. Jones' 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 50mg Quercetin per capsule, with 30 capsules per jar.

    Dosage recommendations

    • Dogs and cats up to 10lbs: 1/2 capsule daily
    • Dogs 10 - 50lbs: 1 capsule daily
    • Dogs 50-100lbs: 1 and 1/2 capsule daily
    • Dogs over 100lbs: 2 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' Ultimate BioActive Quercetin for Dogs and Cats Ingredients

    Ingredients (per capsule)

    Bioactive Quercetin (Sophora Japonica Extract (flower)) 50mg

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

    The bottle contains 30 capsules in total.

      Review by Mastura


      I've seen some improvement in my cat with less scratching and her acne chin is totally recovered. Thank you Dr. Jones for producing a clean product.
      (Posted on 6/12/2024)

    2. Allergies
      Review by Terrylynn


      I use this one first, and then I got the extra strength one for Miska and it really worked very well for her. I think it’s a great product and I like how fast these products work.
      (Posted on 5/29/2024)

    3. Great Results
      Review by henry


      My English Cocker was scratching endlessly. Resorted to allergy shots that helped but were expensive and not good for her health. Tried a couple of other supplements and didn’t seem to help until gave her this particular one. Her scratching has decreased by more than ninety percent. Very pleased with the results this far.
      (Posted on 4/30/2024)

    4. Works! Didn't need flea drops!
      Review by Summer


      My cat's reaction to fleas was to scratch herself into seizure type of behavior. I started giving this to her, after a week or two, she didn't need the flea drops any more! It was amazing! I've told other cat owners about the product.
      (Posted on 4/28/2024)

    5. It is like a miracle!
      Review by Tania


      I am a repeat customer and have been giving both of my chihuahuas the Ultimate Bioactive Quercetin / 50mg for several months and their allergies are so much better under control! It is like a miracle!
      (Posted on 4/14/2024)

    6. Not helpful for allergies
      Review by Christine


      I purchased this for my cat's skin allergies and unfortunately it did not help him at all. I went through the whole bottle as directed. I gave this two stars because it did seem to help his arthritis symptoms, so at least it wasn't a total loss.
      (Posted on 3/10/2024)

    7. Works great!!
      Review by Amy


      I decided to try this for my almost 17 year old Maltese/Pom. She was DX w/mammary & lung cancer 3 1/2 years ago. It's been a very long, trying road but thanks to great folks like Dr Jones...we have been in great shape. She started itching like crazy so we decided to give this a shot for that but also the other amazing benefits it has. She just finished the bottle and I'm back to place another order. I was told today by a very dear friend of mine that is a Pet Nutritionist that Dr Jones supplements are actually top notch and she recommended that I go through him rather than our local health store :) So that's what I'll do for all of her supplements that he has that she can take :) Thank you Dr Jones!! You are the best!!
      (Posted on 2/15/2024)

    8. Amazing product.. question about dosage
      Review by Sol


      Started giving this to my baby girl Luna who has suffered from chronic ear infections all her 14 years of life not even surgery helped her as much as this product and I know it was working amazing and definitely proved it because I wasn’t able to give it to her for couple weeks (was in hospital sitter forgot to give it to her) and her ears started back again with the itching and smell by the time I came back home… so I started to give immediately and a few days later and her ears are starting to get better again!! Thank you Dr Jones!!

      The only thing is that here on the website the dosage is different from the bottle so which is it? She’s 70lbs do I give her 1.5 caps or 4 like the bottle says?
      (Posted on 1/22/2024)

    9. A good immune booster
      Review by Pat


      With the dog flu going around, it's best to give this to boost my dog's immune system.
      (Posted on 1/11/2024)

    10. Love this stuff!
      Review by Leah


      My dog has been taking allergy shots (very expensive) and Zyrtec for months with not much improvement and we’re about a month into giving him this Quercetin and he has stopped itching.
      (Posted on 1/10/2024)

    11. Not itching or sneezing as much
      Review by MARI


      Not itching or sneezing as much
      (Posted on 12/25/2023)

    12. the advance plus is amazing
      Review by Kristyne


      I use this powder in his food that I make myself. It works really well. I found out how well when I ran out and it was a few days before I got more!! This product really drops the inflammation and thusly reduces pain. I'm excited to get another bottle of the CBD too for such a great price! Thanks Dr Jones
      (Posted on 9/15/2023)

    13. AMAZING!!!
      Review by Micky


      This product has helped my dog who was having some severe symptoms. Even steroids didn't help him out as much as this truly amazing product!!! Can't recommend it enough! Dr. Jones, you're a brilliant vet who really helps pups out!!!
      (Posted on 9/11/2023)

    14. Queritin good for my senior cats
      Review by Jean


      I would recommend Queritin for cats. My two tabby Senior cats Almondmeal and Pecan Pie are doing quite well with this remarkable Queritin treatment I give them each one capsule every other day, noticed improvement with skin care and also helped them with constipation. I’m also hoping it helps avoid diabetes and helps Almond with his heart murmur which will help him to get his dental work done. I am recommending people with cats give it try along with cbd oil ultimate feline.
      (Posted on 9/5/2023)

    15. Dr. Jones' Ultimat Bioactive quercetin
      Review by Nancy


      Another great product from Dr. Jones... bought the quercetin for my cocker spaniel with awful irritated ears. This is way cheaper and a better quality supplement. I bought 6 bottles...great price.
      Thank you for everything...your videos are so helpful and appreciated!
      (Posted on 6/18/2023)

    16. Works well
      Review by Barb


      Dr. Jones Quercetin really does seem to work better than a supplement I got from the store. I have two large dogs, so Inwish this came in a bigger size, though.
      (Posted on 6/11/2023)

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