Overview
SCIENTIFIC SCORE
Possibly Effective
Based on 7 Researches
7.6
USERS' SCORE
Good
Based on 20 Reviews
8.2
Supplement Facts
Serving Size: 1 Vegetarian capsule
Amount Per Serving
%DV
Bio-Quercetin® Proprietary Blend providing 35% quercetin (10 mg) [from Japanese sophora concentrate flower bud)], 30% galactomannans (8 mg) [from fenugreek (seed)]
30 mg
**
Top Medical Research Studies
9
We investigated whether quercetin, a natural plant compound, could help combat common cold caused by rhinovirus (RV). In our study, quercetin reduced RV replication and inflammation in airway cells both in laboratory settings and in mice. When given before or after infection, quercetin limited the virus's ability to replicate and decreased harmful immune responses.
While our findings are promising, indicating that quercetin acts at various points in the virus's lifecycle, we recognize the need for further research to solidify its effectiveness in treating or preventing common colds.
While our findings are promising, indicating that quercetin acts at various points in the virus's lifecycle, we recognize the need for further research to solidify its effectiveness in treating or preventing common colds.
Read More
8
We investigated how quercetin 7-glucoside (Q7G), sourced from Lagerstroemia speciosa, affects human rhinovirus 2 (HRV2), a leading cause of the common cold. Utilizing a method to reduce cytopathic effects, we found that Q7G significantly reduced HRV2 replication by blocking the virus's early infection stage.
Interestingly, compared to ribavirin, a known antiviral, Q7G showed stronger efficacy, suggesting its potential as a treatment for HRV2. While these results are promising, further research is needed to assess the practicality of using Q7G in common cold therapies.
Interestingly, compared to ribavirin, a known antiviral, Q7G showed stronger efficacy, suggesting its potential as a treatment for HRV2. While these results are promising, further research is needed to assess the practicality of using Q7G in common cold therapies.
Read More
8
Quercetin's antiviral potential confirmed
We explored the effects of quercetin-3-methyl ether, a natural flavonoid, on the common cold virus, specifically human rhinovirus 1B (HRV1B).
In our study, we found that this compound not only inhibited the virus's replication in human cells but also targeted the early stages of infection.
Additionally, quercetin enhanced early cell death to help combat the virus's immune evasion tactics.
While our findings highlight its potential as a new antiviral agent, further research is necessary to confirm its effectiveness in broader treatments.
In our study, we found that this compound not only inhibited the virus's replication in human cells but also targeted the early stages of infection.
Additionally, quercetin enhanced early cell death to help combat the virus's immune evasion tactics.
While our findings highlight its potential as a new antiviral agent, further research is necessary to confirm its effectiveness in broader treatments.
Read More
Most Useful Reviews
9
Assists cold recovery
100 people found this helpful
Quercetin has been associated with enhanced exercise performance and reduced inflammation, blood pressure, and blood sugar levels. The typical dosage is 500 mg daily. This supplement contains 29mg of Bio-Quercetin phytosome (providing 10 mg quercetin) and claims up to 50 times more bioavailability than standard quercetin. I used it for the common cold, and it was highly effective. I keep it at home, especially as I've heard it's part of the anti-covid protocol during these challenging times. Stay healthy!
Read More
9
Excellent for colds
8 people found this helpful
After suffering from Covid, I discovered quercetin, which is beneficial for those with respiratory issues. Having taken it alongside other treatments for two months, I noticed a significant reduction in cough and seasonal colds. It has proven effective during Covid, leading to easier recovery. Importantly, I experienced no side effects. I recommend consulting a doctor before use.
Read More
9
Boosts immune recovery
4 people found this helpful
I find Bioquercetin 30 Vegetarian Capsules to be immensely helpful. It quickly helps with colds and viral infections, aiding recovery and relieving inflammation. The ingredient quality is excellent, enhancing my respiratory immunity. It’s an effective antioxidant that genuinely combats inflammation and has become an essential part of my health routine.
Read More
Medical Researches
SCIENTIFIC SCORE
Possibly Effective
Based on 7 Researches
7.6
- All Researches
9
We explored the role of flavonoid compounds, like quercetin, in reducing the frequency and severity of upper respiratory tract infections (URTIs) in healthy adults. An in-depth review of 14 studies showed that flavonoid supplementation notably reduced the incidence of URTIs by 33% and sick days by 40%.
However, we noted that changes in immune markers were minimal, indicating that while there are advantages in reducing infections, the immune response may not be significantly affected.
However, we noted that changes in immune markers were minimal, indicating that while there are advantages in reducing infections, the immune response may not be significantly affected.
Read More
9
We investigated whether quercetin, a natural plant compound, could help combat common cold caused by rhinovirus (RV). In our study, quercetin reduced RV replication and inflammation in airway cells both in laboratory settings and in mice. When given before or after infection, quercetin limited the virus's ability to replicate and decreased harmful immune responses.
While our findings are promising, indicating that quercetin acts at various points in the virus's lifecycle, we recognize the need for further research to solidify its effectiveness in treating or preventing common colds.
While our findings are promising, indicating that quercetin acts at various points in the virus's lifecycle, we recognize the need for further research to solidify its effectiveness in treating or preventing common colds.
Read More
8
Quercetin's antiviral potential confirmed
We explored the effects of quercetin-3-methyl ether, a natural flavonoid, on the common cold virus, specifically human rhinovirus 1B (HRV1B).
In our study, we found that this compound not only inhibited the virus's replication in human cells but also targeted the early stages of infection.
Additionally, quercetin enhanced early cell death to help combat the virus's immune evasion tactics.
While our findings highlight its potential as a new antiviral agent, further research is necessary to confirm its effectiveness in broader treatments.
In our study, we found that this compound not only inhibited the virus's replication in human cells but also targeted the early stages of infection.
Additionally, quercetin enhanced early cell death to help combat the virus's immune evasion tactics.
While our findings highlight its potential as a new antiviral agent, further research is necessary to confirm its effectiveness in broader treatments.
Read More
8
Quercetin shows promise against viruses
We explored the effectiveness of quercetin-type flavonols in combating viral lower respiratory infections through a systematic review of 11 preclinical studies.
Our findings highlighted quercetin's impressive antiviral activity, showing lower mortality rates and reduced viral loads in infected animals.
Moreover, quercetin appeared to alleviate inflammation and mucus production, suggesting a multifaceted benefit for respiratory health. Overall, quercetin could be a promising option for those facing respiratory viral challenges.
Our findings highlighted quercetin's impressive antiviral activity, showing lower mortality rates and reduced viral loads in infected animals.
Moreover, quercetin appeared to alleviate inflammation and mucus production, suggesting a multifaceted benefit for respiratory health. Overall, quercetin could be a promising option for those facing respiratory viral challenges.
Read More
8
We investigated how quercetin 7-glucoside (Q7G), sourced from Lagerstroemia speciosa, affects human rhinovirus 2 (HRV2), a leading cause of the common cold. Utilizing a method to reduce cytopathic effects, we found that Q7G significantly reduced HRV2 replication by blocking the virus's early infection stage.
Interestingly, compared to ribavirin, a known antiviral, Q7G showed stronger efficacy, suggesting its potential as a treatment for HRV2. While these results are promising, further research is needed to assess the practicality of using Q7G in common cold therapies.
Interestingly, compared to ribavirin, a known antiviral, Q7G showed stronger efficacy, suggesting its potential as a treatment for HRV2. While these results are promising, further research is needed to assess the practicality of using Q7G in common cold therapies.
Read More
User Reviews
USERS' SCORE
Good
Based on 20 Reviews
8.2
- All Reviews
- Positive Reviews
- Negative Reviews
9
Assists cold recovery
100 people found this helpful
Quercetin has been associated with enhanced exercise performance and reduced inflammation, blood pressure, and blood sugar levels. The typical dosage is 500 mg daily. This supplement contains 29mg of Bio-Quercetin phytosome (providing 10 mg quercetin) and claims up to 50 times more bioavailability than standard quercetin. I used it for the common cold, and it was highly effective. I keep it at home, especially as I've heard it's part of the anti-covid protocol during these challenging times. Stay healthy!
Read More
9
Excellent for colds
8 people found this helpful
After suffering from Covid, I discovered quercetin, which is beneficial for those with respiratory issues. Having taken it alongside other treatments for two months, I noticed a significant reduction in cough and seasonal colds. It has proven effective during Covid, leading to easier recovery. Importantly, I experienced no side effects. I recommend consulting a doctor before use.
Read More
9
Boosts immune recovery
4 people found this helpful
I find Bioquercetin 30 Vegetarian Capsules to be immensely helpful. It quickly helps with colds and viral infections, aiding recovery and relieving inflammation. The ingredient quality is excellent, enhancing my respiratory immunity. It’s an effective antioxidant that genuinely combats inflammation and has become an essential part of my health routine.
Read More
10
No more colds
1 people found this helpful
The capsules are small and seem to be easily absorbed. I no longer catch common colds!
Read More
8
Strengthens immune system
1 people found this helpful
Quercetin in its bioavailable form helps bolster the immune system and restore the body’s defences during seasonal flu and cold epidemics. This advanced formula improves immune support and decreases the risk of colds and viral diseases while enhancing the function of the lungs and bronchi.
Read More
Frequently Asked Questions
9
Effective against viruses
3 people found this helpful
This strong quercetin helps combat viruses effectively. I use it at the first sign of a cold, and by the following day, symptoms usually disappear.
9
Outstanding immunity boost
2 people found this helpful
I have been using this product for about two years now and have not caught any cold, flu, or other immunity issues during this time. I recommended it to my mum, who enjoyed similar results. Neither of us has contracted Covid, which is a significant benefit. The capsules are small and flavourless, easy to swallow. I also take it to combat inflammation, which has had remarkable benefits. I plan to continue using it.
4
Still waiting
I purchased this product over a week ago to treat nasal allergies and the common cold, but I haven't noticed the desired results yet. I hope it will work eventually, and if it improves, I will update my review.
9
Excellent for colds
8 people found this helpful
After suffering from Covid, I discovered quercetin, which is beneficial for those with respiratory issues. Having taken it alongside other treatments for two months, I noticed a significant reduction in cough and seasonal colds. It has proven effective during Covid, leading to easier recovery. Importantly, I experienced no side effects. I recommend consulting a doctor before use.
7.5
Easier recovery
I feel that recovering from the common cold is easier now, and my nasal sensitivity is significantly reduced.
8
Effective duo
1 people found this helpful
This is my permanent purchase. In the case of a common cold, quercetin and zinc are a very effective combination that helps to alleviate malaise and prevent complications. I also take quercetin for seasonal allergies, which is very helpful. The quality of Life Extension products is unquestionable.
7.5
First aid
This is a favourite in our first aid kit; we take it with monolaurin and don’t notice the common cold.
6
Immunity booster
3 people found this helpful
I’ve heard it’s good for the immune system, so I take it daily, sometimes up to three times a day if I sense a cold coming on. It works well.
8
Strengthens immune system
1 people found this helpful
Quercetin in its bioavailable form helps bolster the immune system and restore the body’s defences during seasonal flu and cold epidemics. This advanced formula improves immune support and decreases the risk of colds and viral diseases while enhancing the function of the lungs and bronchi.
8
Quercetin's antiviral potential confirmed
We explored the effects of quercetin-3-methyl ether, a natural flavonoid, on the common cold virus, specifically human rhinovirus 1B (HRV1B).
In our study, we found that this compound not only inhibited the virus's replication in human cells but also targeted the early stages of infection.
Additionally, quercetin enhanced early cell death to help combat the virus's immune evasion tactics.
While our findings highlight its potential as a new antiviral agent, further research is necessary to confirm its effectiveness in broader treatments.
In our study, we found that this compound not only inhibited the virus's replication in human cells but also targeted the early stages of infection.
Additionally, quercetin enhanced early cell death to help combat the virus's immune evasion tactics.
While our findings highlight its potential as a new antiviral agent, further research is necessary to confirm its effectiveness in broader treatments.
4
We aimed to understand if onion peel extract (OPE), which is high in quercetin, could enhance immune response in people with upper respiratory infections. In our randomized double-blind trial, we analyzed 80 participants who took either OPE or a placebo for 8 weeks.
We found that OPE improved specific cold symptoms, like hoarseness, but interestingly, it did not significantly affect immune markers or cytokine levels overall. However, those with severe symptoms showed improved immune activity with OPE. Importantly, participants experienced no significant side effects.
We found that OPE improved specific cold symptoms, like hoarseness, but interestingly, it did not significantly affect immune markers or cytokine levels overall. However, those with severe symptoms showed improved immune activity with OPE. Importantly, participants experienced no significant side effects.
8
Quercetin shows promise against viruses
We explored the effectiveness of quercetin-type flavonols in combating viral lower respiratory infections through a systematic review of 11 preclinical studies.
Our findings highlighted quercetin's impressive antiviral activity, showing lower mortality rates and reduced viral loads in infected animals.
Moreover, quercetin appeared to alleviate inflammation and mucus production, suggesting a multifaceted benefit for respiratory health. Overall, quercetin could be a promising option for those facing respiratory viral challenges.
Our findings highlighted quercetin's impressive antiviral activity, showing lower mortality rates and reduced viral loads in infected animals.
Moreover, quercetin appeared to alleviate inflammation and mucus production, suggesting a multifaceted benefit for respiratory health. Overall, quercetin could be a promising option for those facing respiratory viral challenges.
8
We investigated how quercetin 7-glucoside (Q7G), sourced from Lagerstroemia speciosa, affects human rhinovirus 2 (HRV2), a leading cause of the common cold. Utilizing a method to reduce cytopathic effects, we found that Q7G significantly reduced HRV2 replication by blocking the virus's early infection stage.
Interestingly, compared to ribavirin, a known antiviral, Q7G showed stronger efficacy, suggesting its potential as a treatment for HRV2. While these results are promising, further research is needed to assess the practicality of using Q7G in common cold therapies.
Interestingly, compared to ribavirin, a known antiviral, Q7G showed stronger efficacy, suggesting its potential as a treatment for HRV2. While these results are promising, further research is needed to assess the practicality of using Q7G in common cold therapies.
9
We explored the role of flavonoid compounds, like quercetin, in reducing the frequency and severity of upper respiratory tract infections (URTIs) in healthy adults. An in-depth review of 14 studies showed that flavonoid supplementation notably reduced the incidence of URTIs by 33% and sick days by 40%.
However, we noted that changes in immune markers were minimal, indicating that while there are advantages in reducing infections, the immune response may not be significantly affected.
However, we noted that changes in immune markers were minimal, indicating that while there are advantages in reducing infections, the immune response may not be significantly affected.
References
- Song JH, Mun SH, Mishra S, Kim SR, Yang H, et al. Quercetin-3-Methyl Ether Induces Early Apoptosis to Overcome HRV1B Immune Evasion, Suppress Viral Replication, and Mitigate Inflammatory Pathogenesis. Biomol Ther (Seoul). 2025;33:388. doi:10.4062/biomolther.2024.204
- Cho H, Kim S, Lee SH, Park Y. Effect of onion ( L.) peel extract on natural killer cell and cytokines in a randomized, double-blind, placebo-controlled trial. Nutr Res Pract. 2024;18:33. doi:10.4162/nrp.2024.18.1.33
- Brito JCM, Lima WG, Cordeiro LPB, da Cruz Nizer WS. Effectiveness of supplementation with quercetin-type flavonols for treatment of viral lower respiratory tract infections: Systematic review and meta-analysis of preclinical studies. Phytother Res. 2021;35:4930. doi:10.1002/ptr.7122
- Xander N, Reddy Vari H, Eskandar R, Li W, Bolla S, et al. Rhinovirus-Induced SIRT-1 via TLR2 Regulates Subsequent Type I and Type III IFN Responses in Airway Epithelial Cells. J Immunol. 2019;203:2508. doi:10.4049/jimmunol.1900165
- Somerville VS, Braakhuis AJ, Hopkins WG. Effect of Flavonoids on Upper Respiratory Tract Infections and Immune Function: A Systematic Review and Meta-Analysis. Adv Nutr. 2016;7:488. doi:10.3945/an.115.010538
- Song JH, Park KS, Kwon DH, Choi HJ. Anti-human rhinovirus 2 activity and mode of action of quercetin-7-glucoside from Lagerstroemia speciosa. J Med Food. 2013;16:274. doi:10.1089/jmf.2012.2290
- Ganesan S, Faris AN, Comstock AT, Wang Q, Nanua S, et al. Quercetin inhibits rhinovirus replication in vitro and in vivo. Antiviral Res. 2012;94:258. doi:10.1016/j.antiviral.2012.03.005
