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Next-day processing (weekdays).
Orders placed on weekdays are dispatched the same or next working day from our warehouse in the Netherlands.
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Free shipping available.
Shipped from our warehouse in the Netherlands. As the official European distributor, we ensure the quality you expect — duties and taxes included for EU orders.
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Quercetin - Supports Immune Balance
Quercetin - Supports Immune Balance
What you can expect:
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Next-day processing (weekdays).
Orders placed on weekdays are dispatched the same or next working day from our warehouse in the Netherlands.
Shipping policy → -
Free shipping available.
Shipped from our warehouse in the Netherlands. As the official European distributor, we ensure the quality you expect — duties and taxes included for EU orders.
Shipping policy → -
30-day money-back guarantee.
If it is not right for you, return it within 30 days for a full refund — just send it back.
Shipping policy →
Bladder-friendly daily nutrition
Quercetin, a plant flavonoid in a measured daily amount
500 mg of quercetin — the flavonoid found in onions, apples, berries and green tea — with a little purified Desert Harvest aloe vera, in 90 vegan capsules. A calm daily food supplement, distributed across Europe by Bivio Medical.
For IC/BPS, bladder sensitivity & mast-cell flares
How Quercetin supports mast-cell and histamine calm in IC/BPS
Interstitial cystitis (IC/BPS) is associated with mast-cell activation and elevated histamine in the bladder wall — a cycle of immune signalling that can drive the pain, urgency and sensitivity many people live with daily. Quercetin is a plant-derived flavonoid studied for its ability to support immune balance at the mast-cell level. It is one of the supplements people with IC/BPS most commonly reach for alongside their bladder-care routine.
Quercetin is a flavonoid — a class of plant antioxidants that give fruits and vegetables their bright colours. In IC/BPS, mast cells in the bladder wall are thought to become over-activated, releasing histamine and other inflammatory signals that contribute to pain and urgency. Studies suggest quercetin may help stabilise mast cells and moderate this histamine release, supporting a calmer immune response. Desert Harvest Quercetin is derived from the flower buds of the Japanese pagoda tree (Sophora japonica) and paired with 100 mg of organic anthraquinone-free aloe vera per serving — the same purified, acemannan-rich aloe used in Super-Strength Aloe Vera — providing naturally occurring polysaccharides alongside the flavonoid. Capillary wall stability and healthy collagen development are additional mechanisms quercetin is associated with in the research literature.
Mast-cell and histamine support
Quercetin from Sophora japonica is studied for its ability to support mast-cell stability and moderate histamine signalling in sensitive tissue.
Paired with anthraquinone-free aloe vera
Each serving combines 500 mg quercetin with 100 mg organic aloe vera powder — the same purified, anthraquinone-free aloe trusted by people with IC/BPS for decades.
Bladder-friendly, nothing unnecessary
Gluten-free, no fillers, no artificial ingredients — formulated with a sensitive bladder in mind and manufactured to cGMP standards.
People with IC/BPS who include quercetin in their daily routine report that it helps take the edge off flare-related sensitivity and urgency, particularly in episodes they associate with food triggers or histamine-rich foods. As with all food supplements, responses vary — some people notice a difference within a few weeks, while others find the benefit builds over a longer period. It is a food supplement, not a medicine, and is used by many people with a sensitive bladder as part of a broader, personalised IC care approach.
Desert Harvest has supported people with interstitial cystitis since the early 1990s. Quercetin is among the supplements most frequently mentioned in IC community discussions and in integrative bladder-health literature, and it sits within a formulation range that is entirely gluten-free, bladder-friendly, and free from fillers and artificial ingredients — built to the strict cGMP standards Desert Harvest applies across every product. Reviewed by the Desert Harvest Europe team. Last reviewed June 2026.
Questions people ask
Can quercetin help with interstitial cystitis (IC/BPS)?
Many people with IC/BPS use quercetin as part of their daily supplement routine. Studies suggest it may support mast-cell stability and moderate histamine release in the bladder wall — two mechanisms thought to contribute to IC-related pain and urgency. It is a food supplement, not a medicine, and responses vary between individuals, but it is among the most widely used flavonoids in the IC community.
What is the link between mast cells, histamine and IC/BPS?
In interstitial cystitis, mast cells in the bladder wall are thought to become over-activated, releasing histamine and other signalling compounds that drive pain, urgency and sensitivity. Quercetin is a flavonoid that studies suggest may help stabilise mast-cell activity and reduce histamine release, which is why it is of particular interest to people managing IC/BPS.
Is this quercetin bladder-friendly?
Desert Harvest Quercetin is formulated specifically with a sensitive bladder in mind — it is gluten-free, contains no fillers or artificial ingredients, and is paired with organic anthraquinone-free aloe vera. The range follows the same strict cGMP manufacturing standards applied across all Desert Harvest supplements. As always, if you are unsure whether a new supplement is right for you, consult a qualified healthcare professional.
Can I take quercetin alongside Super-Strength Aloe Vera?
Many people with IC/BPS take quercetin alongside Super-Strength Aloe Vera and Calcium Glycerophosphate as part of a layered bladder-care routine — addressing the GAG layer, food-related acidity and mast-cell sensitivity together. Desert Harvest Quercetin already includes 100 mg of organic purified aloe per serving, so it fits naturally within that approach. As with any supplement combination, it is worth discussing with your healthcare professional.
What's in every serving
A simple quercetin food supplement
Quercetin in a measured daily amount, with a little aloin-free aloe vera — described plainly, in composition facts, with no health claims.
A plant flavonoid
Quercetin is a naturally occurring flavonoid found in everyday foods such as onions, apples, berries, capers and green tea. A typical diet provides only modest amounts.
500 mg per serving
Each two-capsule serving provides 500 mg of quercetin, paired with a little anthraquinone-free Desert Harvest aloe vera.
An easy daily habit
90 vegan capsules. Two capsules, up to twice a day, with a full glass of liquid, as part of a calm routine.
About quercetin
Quercetin, described plainly
Quercetin is one of the most widely studied plant flavonoids — a natural pigment compound found in everyday foods such as onions, apples, berries, capers and green tea. A typical mixed diet provides only modest amounts.
This is a simple food supplement that provides quercetin in a measured daily amount, paired with a little Desert Harvest aloe vera. It is popular among people who follow a bladder-friendly daily routine and want to include quercetin alongside their doctor's guidance.
Quercetin is a food, not a medicine, and we make no claim that it treats, prevents or relieves any condition. We describe the composition plainly and let you decide. To see how the wider range fits a bladder-friendly routine, read the guide.
Read the guideThe detail
Quercetin — at a glance
| Specification | Quercetin |
|---|---|
| Quercetin per serving | 500 mg |
| Servings per bottle | 45 (2 capsules) |
| Capsules per bottle | 90 vegan capsules |
| Also contains | Purified Desert Harvest aloe vera (100 mg) |
| Suitable for | Vegetarians and vegans |
| Testing | Third-party tested composition |
Good to know
Questions people ask
What is quercetin and where is it found?
Is quercetin used by people with interstitial cystitis?
How much quercetin is in a serving, and how do I take it?
Which vitamins and minerals are best to take with a sensitive bladder?
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Read →What people say
Rated 4.97 out of 5 by Desert Harvest customers
Desert Harvest is one company worldwide. These are reviews from the wider Desert Harvest community — our European reviews are still growing.
“It helped me after about two weeks to release my pains.”
Roger Eppley
“Great product and it helps with my seasonal allergies as well.”
PA
“Desert Harvest is the best company for all your bladder needs.”
Trisha McClellan
Bladder-friendly daily nutrition — the guide · All articles · Buffered Vitamin C · Super-Strength Aloe Vera · Food acid & the bladder
Food supplement. Not a substitute for a varied, balanced diet and a healthy lifestyle. Do not exceed the recommended daily dose. Keep out of reach of children. Consult a healthcare professional before use if pregnant, breastfeeding, taking medication, or if you have a medical condition. This is a food, not a medicine; no medical claims are made about this product. Made in the USA by Desert Harvest Ltd. Imported into the EU by BIVIO Medical B.V., Zuideinde 91, 1843 JM Grootschermer, Netherlands.
Organic Aloe Vera
Grown in nutrient-rich volcanic soil to maximize potency, purity, and health benefits from the very start.
Patented Harvesting Process
A unique method begins within 20 minutes of harvest to lock in nutrients and remove harmful latex compounds.
Bladder & IC Friendly
Formulated specifically to support bladder health and Interstitial Cystitis, trusted by patients worldwide.
Trusted by Experts
Recommended by urologists, pelvic pain specialists, and IC/BPS communities for over 30 years.
From Farm To Bottle
Fresh Harvest
At Desert Harvest, we harvest aloe leaves and begin processing within just 20 minutes to lock in their full nutritional power. This rapid method preserves delicate bioactive compounds that are often lost in slower processing, ensuring maximum potency, purity, and effectiveness in every capsule for optimal pelvic and bladder health.
Latex Removal
Our specialized latex removal process ensures that only the purest aloe vera gel is used in our supplements, eliminating any potentially irritating compounds while preserving the beneficial properties.
Freeze Dried
Through our advanced freeze-drying technology, we preserve the natural structure and potency of aloe vera, creating a stable, concentrated form that maintains its therapeutic benefits.
Certified
Through our advanced freeze-drying technology, we preserve the natural structure and potency of aloe vera, creating a stable, concentrated form that maintains its therapeutic benefits.
Direct Supply
Through our advanced freeze-drying technology, we preserve the natural structure and potency of aloe vera, creating a stable, concentrated form that maintains its therapeutic benefits.
Volcanic Soil
Through our advanced freeze-drying technology, we preserve the natural structure and potency of aloe vera, creating a stable, concentrated form that maintains its therapeutic benefits.