Last update
5/11/2026
Reviewed By
Overview
SCIENTIFIC SCORE
Moderately Effective
Based on 6 Researches
8.5
USERS' SCORE
Good
Based on 95 Reviews
8.6
Supplement Facts
Serving Size: 2 Veg Capsules
Amount Per Serving
%DV
Quercetin
800 mg
**
Bromelain (2,400 GDU/g)
165 mg
**
Top Medical Research Studies
9
Quercetin reduces sinus inflammation
This study explored how quercetin may help reduce inflammation associated with sinusitis using a rat model. We observed that introducing lipopolysaccharides (LPS) caused significant inflammation in nasal and sinus areas, as well as in the lungs and brain.
When we administered quercetin after the LPS treatment, it notably decreased inflammatory markers like TNF-α and IL-6. The results indicated reduced inflammation in nasal and lung tissues, showcasing quercetin's potential benefits. However, while there were encouraging findings, its effects on brain inflammation were more limited.
When we administered quercetin after the LPS treatment, it notably decreased inflammatory markers like TNF-α and IL-6. The results indicated reduced inflammation in nasal and lung tissues, showcasing quercetin's potential benefits. However, while there were encouraging findings, its effects on brain inflammation were more limited.
Read More
9
Quercetin reduces chronic sinusitis via TLR2-NF-κB inhibition
Researchers explored how quercetin, a natural plant compound, might help prevent chronic rhinosinusitis (CRS)—a condition involving persistent nasal inflammation and tissue damage. Using both lab-grown nasal cells and mice with CRS, we found that quercetin significantly reduced inflammatory responses triggered by bacterial toxins and blocked harmful tissue remodeling processes.
The compound worked by shutting down a key inflammatory pathway called TLR2-NF-κB. Quercetin also restored balance to immune cells that had become skewed in CRS, bringing Treg and Th17 levels back into harmony. When researchers artificially reactivated this pathway, quercetin's protective effects disappeared—confirming this mechanism was essential. These results suggest quercetin could become a promising treatment for people struggling with chronic sinusitis.
The compound worked by shutting down a key inflammatory pathway called TLR2-NF-κB. Quercetin also restored balance to immune cells that had become skewed in CRS, bringing Treg and Th17 levels back into harmony. When researchers artificially reactivated this pathway, quercetin's protective effects disappeared—confirming this mechanism was essential. These results suggest quercetin could become a promising treatment for people struggling with chronic sinusitis.
Read More
9
Quercetin reduces sinusitis through inflammation inhibition
We investigated whether quercetin, a natural plant compound, could help treat chronic rhinosinusitis without nasal polyps (CRSsNP)—a widespread inflammatory condition affecting the sinuses. Using a mouse model of the disease, we found that quercetin dose-dependently reduced allergic symptoms like sneezing and nasal itching while restoring normal nasal tissue structure.
Quercetin worked by suppressing inflammation-causing proteins (IL-1β, IL-6, and IL-4) and blocking a specific cellular pathway called XBP1/HIF-1α/wnt-β-catenin that drives tissue damage. Lab tests with human nasal cells confirmed that quercetin prevented harmful cell death and restored cell growth that the disease had suppressed. These findings suggest quercetin could be a promising natural treatment for chronic sinusitis.
Quercetin worked by suppressing inflammation-causing proteins (IL-1β, IL-6, and IL-4) and blocking a specific cellular pathway called XBP1/HIF-1α/wnt-β-catenin that drives tissue damage. Lab tests with human nasal cells confirmed that quercetin prevented harmful cell death and restored cell growth that the disease had suppressed. These findings suggest quercetin could be a promising natural treatment for chronic sinusitis.
Read More
Most Useful Reviews
10
Life-changing results
691 people found this helpful
This is incredible. I’ve suffered from nearly constant earaches for over 10 years. Despite visits to the doctor and prescribed medication, the problem persisted. After trying this product, my sinuses opened immediately, alleviating my ear pain. It has led to increased energy and improved well-being—I hadn’t felt this good in years!
Read More
9
Allergy relief obtained
59 people found this helpful
I developed chronic sinusitis due to Eustachian tube dysfunction from allergies. Previously, I'd visit doctors for antibiotics without any lasting relief. After starting this product, I’ve had no sinusitis or clogged ears. It even helped my sister with her allergies. Her quality of life has significantly improved!
Read More
9
Improved nasal congestion
33 people found this helpful
I started taking one tablet twice daily for my chronic sinusitis. After a month, my headaches from rhinitis faded, and I no longer wake up with a clogged nose. When my rhinitis was severe, I took two tablets twice a day, and I felt progressively better. I intend to continue this.
Read More
Medical Researches
SCIENTIFIC SCORE
Moderately Effective
Based on 6 Researches
8.5
- All Researches
9
Quercetin reduces sinus inflammation
This study explored how quercetin may help reduce inflammation associated with sinusitis using a rat model. We observed that introducing lipopolysaccharides (LPS) caused significant inflammation in nasal and sinus areas, as well as in the lungs and brain.
When we administered quercetin after the LPS treatment, it notably decreased inflammatory markers like TNF-α and IL-6. The results indicated reduced inflammation in nasal and lung tissues, showcasing quercetin's potential benefits. However, while there were encouraging findings, its effects on brain inflammation were more limited.
When we administered quercetin after the LPS treatment, it notably decreased inflammatory markers like TNF-α and IL-6. The results indicated reduced inflammation in nasal and lung tissues, showcasing quercetin's potential benefits. However, while there were encouraging findings, its effects on brain inflammation were more limited.
Read More
9
Quercetin reduces chronic sinusitis via TLR2-NF-κB inhibition
Researchers explored how quercetin, a natural plant compound, might help prevent chronic rhinosinusitis (CRS)—a condition involving persistent nasal inflammation and tissue damage. Using both lab-grown nasal cells and mice with CRS, we found that quercetin significantly reduced inflammatory responses triggered by bacterial toxins and blocked harmful tissue remodeling processes.
The compound worked by shutting down a key inflammatory pathway called TLR2-NF-κB. Quercetin also restored balance to immune cells that had become skewed in CRS, bringing Treg and Th17 levels back into harmony. When researchers artificially reactivated this pathway, quercetin's protective effects disappeared—confirming this mechanism was essential. These results suggest quercetin could become a promising treatment for people struggling with chronic sinusitis.
The compound worked by shutting down a key inflammatory pathway called TLR2-NF-κB. Quercetin also restored balance to immune cells that had become skewed in CRS, bringing Treg and Th17 levels back into harmony. When researchers artificially reactivated this pathway, quercetin's protective effects disappeared—confirming this mechanism was essential. These results suggest quercetin could become a promising treatment for people struggling with chronic sinusitis.
Read More
9
Quercetin reduces immune-driven sinusitis progression
Researchers explored quercetin's potential to treat chronic rhinosinusitis with nasal polyps (CRSwNP) by examining how it affects immune cell behavior and tissue changes. The study found that quercetin reduced the activity of M2 macrophages—immune cells that promote inflammation and tissue remodeling—by blocking a molecular pathway called JAK2/STAT3.
In laboratory tests, quercetin prevented nasal cells from undergoing harmful changes when exposed to these inflamed macrophages. In mice with CRSwNP, quercetin treatment reduced nasal symptoms, polyp formation, and inflammation while restoring normal tissue structure. These findings suggest quercetin could become a natural therapeutic option for managing this chronic respiratory condition.
In laboratory tests, quercetin prevented nasal cells from undergoing harmful changes when exposed to these inflamed macrophages. In mice with CRSwNP, quercetin treatment reduced nasal symptoms, polyp formation, and inflammation while restoring normal tissue structure. These findings suggest quercetin could become a natural therapeutic option for managing this chronic respiratory condition.
Read More
9
Quercetin reduces sinusitis through inflammation inhibition
We investigated whether quercetin, a natural plant compound, could help treat chronic rhinosinusitis without nasal polyps (CRSsNP)—a widespread inflammatory condition affecting the sinuses. Using a mouse model of the disease, we found that quercetin dose-dependently reduced allergic symptoms like sneezing and nasal itching while restoring normal nasal tissue structure.
Quercetin worked by suppressing inflammation-causing proteins (IL-1β, IL-6, and IL-4) and blocking a specific cellular pathway called XBP1/HIF-1α/wnt-β-catenin that drives tissue damage. Lab tests with human nasal cells confirmed that quercetin prevented harmful cell death and restored cell growth that the disease had suppressed. These findings suggest quercetin could be a promising natural treatment for chronic sinusitis.
Quercetin worked by suppressing inflammation-causing proteins (IL-1β, IL-6, and IL-4) and blocking a specific cellular pathway called XBP1/HIF-1α/wnt-β-catenin that drives tissue damage. Lab tests with human nasal cells confirmed that quercetin prevented harmful cell death and restored cell growth that the disease had suppressed. These findings suggest quercetin could be a promising natural treatment for chronic sinusitis.
Read More
8
Quercetin enhances mucus transport
We explored how quercetin might help sinusitis by boosting chloride secretion and improving ciliary beat frequency in cultured sinonasal cells. In our analysis, this compound showed notable ability to enhance these functions, suggesting it could promote better mucus clearance from the sinuses.
The study involved primary cultures of human and murine sinonasal epithelial cells and demonstrated quercetin's effectiveness in increasing chloride transport. This implies potential therapeutic benefits for individuals suffering from chronic rhinosinusitis.
The study involved primary cultures of human and murine sinonasal epithelial cells and demonstrated quercetin's effectiveness in increasing chloride transport. This implies potential therapeutic benefits for individuals suffering from chronic rhinosinusitis.
Read More
User Reviews
USERS' SCORE
Good
Based on 95 Reviews
8.6
- All Reviews
- Positive Reviews
- Negative Reviews
10
Life-changing results
691 people found this helpful
This is incredible. I’ve suffered from nearly constant earaches for over 10 years. Despite visits to the doctor and prescribed medication, the problem persisted. After trying this product, my sinuses opened immediately, alleviating my ear pain. It has led to increased energy and improved well-being—I hadn’t felt this good in years!
Read More
9
Allergy relief obtained
59 people found this helpful
I developed chronic sinusitis due to Eustachian tube dysfunction from allergies. Previously, I'd visit doctors for antibiotics without any lasting relief. After starting this product, I’ve had no sinusitis or clogged ears. It even helped my sister with her allergies. Her quality of life has significantly improved!
Read More
9
Improved nasal congestion
33 people found this helpful
I started taking one tablet twice daily for my chronic sinusitis. After a month, my headaches from rhinitis faded, and I no longer wake up with a clogged nose. When my rhinitis was severe, I took two tablets twice a day, and I felt progressively better. I intend to continue this.
Read More
8
Good for seasonal allergies
30 people found this helpful
I struggled with a stuffy nose due to seasonal allergies, but after trying this product, I was amazed at how effective the first tablet was. That night I could breathe easily and sleep well. Quercetin is a valuable alternative for those looking to avoid medications. Highly recommend it for sinusitis!
Read More
6
Moderate sinusitis relief
17 people found this helpful
I took this review from the 120-capsule bottle. I initially experienced headaches but have since adjusted. With sinusitis, my symptoms improved by about 30–40% after taking the supplement. I recommend starting with one tablet a day for a week to adapt, then increasing the dosage as needed.
Read More
Frequently Asked Questions
9
Improved nasal congestion
33 people found this helpful
I started taking one tablet twice daily for my chronic sinusitis. After a month, my headaches from rhinitis faded, and I no longer wake up with a clogged nose. When my rhinitis was severe, I took two tablets twice a day, and I felt progressively better. I intend to continue this.
9
Game-changer
3 people found this helpful
As someone with recurring sinusitis, quercetin with bromelain has transformed my experience. Within weeks, I noticed significant relief from sinus congestion and inflammation. This product is easy to take, plant-based, and has become an essential part of my routine. I highly recommend it for anyone facing sinus or respiratory issues.
8
Sinusitis remedy
4 people found this helpful
I use this supplement for sinusitis. If taken properly in the morning and evening for a week, it can effectively heal the condition without resorting to antibiotics. This has spared me from hospital visits and the unpleasant side effects of antibiotics.
0
No effect noted
4 people found this helpful
I noticed zero effect on my sinusitis. This product did not alleviate my nasal congestion caused by allergies.
8
Good for seasonal allergies
30 people found this helpful
I struggled with a stuffy nose due to seasonal allergies, but after trying this product, I was amazed at how effective the first tablet was. That night I could breathe easily and sleep well. Quercetin is a valuable alternative for those looking to avoid medications. Highly recommend it for sinusitis!
7
Nasal congestion relief
6 people found this helpful
I bought this due to my chronic sinusitis and was intrigued by the reviews. Since starting, my nasal congestion has improved, and my stress levels have decreased. I hope it also assists with my allergic rhinitis during pollen season.
9
Significant effect noted
5 people found this helpful
I started taking this supplement during the pandemic and have been consistently using it ever since. When my chronic sinusitis flares up, I take it alongside NAC, and I’ve never experienced such positive results in my ten years of battling sinusitis. I'm very pleased with the effects.
9
Natural antihistamine
5 people found this helpful
I cannot emphasise enough how excellent this product is. For those needing antihistamines for persistent allergies, this is a great natural alternative, effectively addressing my sinusitis and eye allergies from pollution. Just ensure to take it with food.
6
Moderate sinusitis relief
17 people found this helpful
I took this review from the 120-capsule bottle. I initially experienced headaches but have since adjusted. With sinusitis, my symptoms improved by about 30–40% after taking the supplement. I recommend starting with one tablet a day for a week to adapt, then increasing the dosage as needed.
7
Anti-allergy effect
4 people found this helpful
I have been taking quercetin for 2.5 years after being diagnosed with AIDS, as prescribed by my doctor. It also has the added benefit of reducing allergies. I took it from July to September to combat ambrosia reactions, and it helped tremendously. Additionally, it contains bromelain, which aids in the fight against chronic sinusitis. I really appreciate the quality of this brand. The capsules are small, with a neutral taste, making it an essential dietary supplement for me.
9
Quercetin reduces sinus inflammation
This study explored how quercetin may help reduce inflammation associated with sinusitis using a rat model. We observed that introducing lipopolysaccharides (LPS) caused significant inflammation in nasal and sinus areas, as well as in the lungs and brain.
When we administered quercetin after the LPS treatment, it notably decreased inflammatory markers like TNF-α and IL-6. The results indicated reduced inflammation in nasal and lung tissues, showcasing quercetin's potential benefits. However, while there were encouraging findings, its effects on brain inflammation were more limited.
When we administered quercetin after the LPS treatment, it notably decreased inflammatory markers like TNF-α and IL-6. The results indicated reduced inflammation in nasal and lung tissues, showcasing quercetin's potential benefits. However, while there were encouraging findings, its effects on brain inflammation were more limited.
8
Quercetin enhances mucus transport
We explored how quercetin might help sinusitis by boosting chloride secretion and improving ciliary beat frequency in cultured sinonasal cells. In our analysis, this compound showed notable ability to enhance these functions, suggesting it could promote better mucus clearance from the sinuses.
The study involved primary cultures of human and murine sinonasal epithelial cells and demonstrated quercetin's effectiveness in increasing chloride transport. This implies potential therapeutic benefits for individuals suffering from chronic rhinosinusitis.
The study involved primary cultures of human and murine sinonasal epithelial cells and demonstrated quercetin's effectiveness in increasing chloride transport. This implies potential therapeutic benefits for individuals suffering from chronic rhinosinusitis.
7
We explored how quercetin affects sinusitis by examining its impact on human mast cells. Specifically, we focused on the expression of inflammatory cytokines after stimulating the cells.
Quercetin showed promise by reducing the gene expression and production of key inflammatory signals like TNF-alpha and IL-6. It did this by dampening the activation of NF-kappaB and p38 MAPK pathways, both crucial for inflammation.
This suggests that quercetin may be beneficial for managing conditions like sinusitis linked to mast cell activity.
Quercetin showed promise by reducing the gene expression and production of key inflammatory signals like TNF-alpha and IL-6. It did this by dampening the activation of NF-kappaB and p38 MAPK pathways, both crucial for inflammation.
This suggests that quercetin may be beneficial for managing conditions like sinusitis linked to mast cell activity.
References
- Tiboc-Schnell CN, Filip GA, Man SC, Decea N, Moldovan R, et al. Quercetin attenuates naso-sinusal inflammation and inflammatory response in lungs and brain on an experimental model of acute rhinosinusitis in rats. J Physiol Pharmacol. 2020;71. 10.26402/jpp.2020.4.03
- Zhang S, Smith N, Schuster D, Azbell C, Sorscher EJ, et al. Quercetin increases cystic fibrosis transmembrane conductance regulator-mediated chloride transport and ciliary beat frequency: therapeutic implications for chronic rhinosinusitis. Am J Rhinol Allergy. 2011;25:307. 10.2500/ajra.2011.25.3643
- Min YD, Choi CH, Bark H, Son HY, Park HH, et al. Quercetin inhibits expression of inflammatory cytokines through attenuation of NF-kappaB and p38 MAPK in HMC-1 human mast cell line. Inflamm Res. 2007;56:210. PubMed
- Qu X, Tao P, Dong J, Meng L. Quercetin alleviates the progression of chronic rhinosinusitis by affecting nasal mucosal epithelial remodeling, inflammation, and Treg/Th17 imbalance. Biochem Cell Biol. 2025;103:1. 10.1139/bcb-2025-0049
- Qu X, Tao P, Dong J, Meng L. Quercetin attenuates the progression of chronic rhinosinusitis with nasal polyps by regulating macrophage M2 polarization and remodeling of nasal mucosa. Int Immunopharmacol. 2025;162:115120. 10.1016/j.intimp.2025.115120
- Meng L, Qu X, Tao P, Dong J, Guo R. Quercetin Alleviates the Progression of Chronic Rhinosinusitis Without Nasal Polyps by Inhibiting Nasal Mucosal Inflammation and Epithelial Apoptosis. Mol Biotechnol. 2025;67:3532. 10.1007/s12033-024-01269-5
