Reviewed By
Overview
SCIENTIFIC SCORE
Moderately Effective
Based on 3 Researches
8.3
USERS' SCORE
Good
Based on 71 Reviews
8.1
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
8
We observed that quercetin, a powerful antioxidant, plays a significant role in helping grapes withstand cold temperatures. In our study, we found that grapes exposed to low temperatures accumulate more quercetin, which in turn enhances their cold resistance.
By applying exogenous quercetin, we noted a marked improvement in the grapes' ability to endure low-temperature stress. Our research revealed that a key gene, VvFLS1, responsible for quercetin synthesis is upregulated when grapes experience cold conditions.
We also discovered that VvbZIP22, a protein that binds to the VvFLS1 promoter, is crucial for mediating this process. When we overexpressed VvbZIP22 in grapes, it resulted in higher levels of quercetin and improved cold resistance, further confirming its pivotal role in the plant's adaptation to harsh environments.
Through these findings, we highlighted the importance of quercetin in enhancing grape survival during cold spells, showcasing a vital link between plant biology and climate resilience.
By applying exogenous quercetin, we noted a marked improvement in the grapes' ability to endure low-temperature stress. Our research revealed that a key gene, VvFLS1, responsible for quercetin synthesis is upregulated when grapes experience cold conditions.
We also discovered that VvbZIP22, a protein that binds to the VvFLS1 promoter, is crucial for mediating this process. When we overexpressed VvbZIP22 in grapes, it resulted in higher levels of quercetin and improved cold resistance, further confirming its pivotal role in the plant's adaptation to harsh environments.
Through these findings, we highlighted the importance of quercetin in enhancing grape survival during cold spells, showcasing a vital link between plant biology and climate resilience.
Read More
8
Quercetin limits HRV1B replication
We investigated how quercetin-3-methyl ether, a natural flavonoid, impacts human rhinovirus 1B (HRV1B), which is responsible for the common cold and can worsen conditions like asthma. Our research involved testing this compound in HeLa cells to see if it could reduce viral replication and the damage associated with the virus.
In our experiments, quercetin-3-methyl ether significantly inhibited the replication of HRV1B in a concentration-dependent way, which means that higher doses produced better results. We also found that this compound enhanced early apoptosis—essentially, the process by which infected cells shut down in response to the virus—during the critical early stages of infection. This seemed to counteract HRV1B's tactics to evade the immune response.
Additionally, when we administered quercetin-3-methyl ether to mice infected with HRV1B, we observed a noteworthy reduction in viral RNA levels and inflammation in their lung tissues, suggesting a potential therapeutic effect. Our findings enhance the understanding of quercetin-3-methyl ether as a novel agent against HRV1B, pointing towards promising strategies for managing cold-related illnesses and their complications.
In our experiments, quercetin-3-methyl ether significantly inhibited the replication of HRV1B in a concentration-dependent way, which means that higher doses produced better results. We also found that this compound enhanced early apoptosis—essentially, the process by which infected cells shut down in response to the virus—during the critical early stages of infection. This seemed to counteract HRV1B's tactics to evade the immune response.
Additionally, when we administered quercetin-3-methyl ether to mice infected with HRV1B, we observed a noteworthy reduction in viral RNA levels and inflammation in their lung tissues, suggesting a potential therapeutic effect. Our findings enhance the understanding of quercetin-3-methyl ether as a novel agent against HRV1B, pointing towards promising strategies for managing cold-related illnesses and their complications.
Read More
9
We explored how the combination of quercetin (QE) and sucrose (Suc) improves the preservation of porcine liver grafts affected by warm ischemia followed by cold storage. Our study involved two groups of porcine livers: one preserved with the standard University of Wisconsin (UW) solution and the other with the UW solution enhanced with QE and Suc.
After preserving the livers for six hours, we subjected them to a simulated reperfusion model using saline-diluted autologous blood. To measure success, we looked at several indicators of liver health, including specific enzyme levels and histological changes.
The results were promising! The livers treated with QE and Suc showed significantly lower levels of enzymes indicating liver damage compared to those using just the UW solution. Additionally, the histological analysis revealed fewer signs of injury in the QE and Suc group, showcasing their potential in reducing cold injury in liver grafts after ischemia.
Overall, our findings indicate that adding quercetin and sucrose to the preservation solution can effectively protect liver grafts from damage caused by cold storage, especially in cases of donation after circulatory death.
After preserving the livers for six hours, we subjected them to a simulated reperfusion model using saline-diluted autologous blood. To measure success, we looked at several indicators of liver health, including specific enzyme levels and histological changes.
The results were promising! The livers treated with QE and Suc showed significantly lower levels of enzymes indicating liver damage compared to those using just the UW solution. Additionally, the histological analysis revealed fewer signs of injury in the QE and Suc group, showcasing their potential in reducing cold injury in liver grafts after ischemia.
Overall, our findings indicate that adding quercetin and sucrose to the preservation solution can effectively protect liver grafts from damage caused by cold storage, especially in cases of donation after circulatory death.
Read More
Most Useful Reviews
9
Improves colds effect
100 people found this helpful
Quercetin is associated with enhanced exercise performance and reduced inflammation, blood pressure, and blood sugar levels. The typical dose is 500 mg daily. This supplement contains 29 mg of Bio-Quercetin phytosome, equating to 10 mg of quercetin but claims 50 times greater bioavailability. I used it for a cold, and it worked brilliantly. Additionally, I understand it's part of the anti-COVID protocol, so I keep it at home during these challenging times. Stay healthy!
Read More
9
Prevents colds
44 people found this helpful
It works! It keeps me healthy, with no school bus driver colds or sore throats while I take this, or that other bug going around.
Read More
9
Excellent cold relief
5 people found this helpful
Bioquercetin 30 Vegetarian Capsules is an excellent find for immune support. It has aided my recovery from colds and viral illnesses, quickly restoring my strength and alleviating inflammation. The ingredient quality is high, and my respiratory immunity remains superb. Bioquercetin acts as a true antioxidant in combating inflammation. The results are impressive, and it has a lovely taste, making it an essential part of my health regimen.
Read More
Medical Researches
SCIENTIFIC SCORE
Moderately Effective
Based on 3 Researches
8.3
- All Researches
9
We explored how the combination of quercetin (QE) and sucrose (Suc) improves the preservation of porcine liver grafts affected by warm ischemia followed by cold storage. Our study involved two groups of porcine livers: one preserved with the standard University of Wisconsin (UW) solution and the other with the UW solution enhanced with QE and Suc.
After preserving the livers for six hours, we subjected them to a simulated reperfusion model using saline-diluted autologous blood. To measure success, we looked at several indicators of liver health, including specific enzyme levels and histological changes.
The results were promising! The livers treated with QE and Suc showed significantly lower levels of enzymes indicating liver damage compared to those using just the UW solution. Additionally, the histological analysis revealed fewer signs of injury in the QE and Suc group, showcasing their potential in reducing cold injury in liver grafts after ischemia.
Overall, our findings indicate that adding quercetin and sucrose to the preservation solution can effectively protect liver grafts from damage caused by cold storage, especially in cases of donation after circulatory death.
After preserving the livers for six hours, we subjected them to a simulated reperfusion model using saline-diluted autologous blood. To measure success, we looked at several indicators of liver health, including specific enzyme levels and histological changes.
The results were promising! The livers treated with QE and Suc showed significantly lower levels of enzymes indicating liver damage compared to those using just the UW solution. Additionally, the histological analysis revealed fewer signs of injury in the QE and Suc group, showcasing their potential in reducing cold injury in liver grafts after ischemia.
Overall, our findings indicate that adding quercetin and sucrose to the preservation solution can effectively protect liver grafts from damage caused by cold storage, especially in cases of donation after circulatory death.
Read More
8
Quercetin limits HRV1B replication
We investigated how quercetin-3-methyl ether, a natural flavonoid, impacts human rhinovirus 1B (HRV1B), which is responsible for the common cold and can worsen conditions like asthma. Our research involved testing this compound in HeLa cells to see if it could reduce viral replication and the damage associated with the virus.
In our experiments, quercetin-3-methyl ether significantly inhibited the replication of HRV1B in a concentration-dependent way, which means that higher doses produced better results. We also found that this compound enhanced early apoptosis—essentially, the process by which infected cells shut down in response to the virus—during the critical early stages of infection. This seemed to counteract HRV1B's tactics to evade the immune response.
Additionally, when we administered quercetin-3-methyl ether to mice infected with HRV1B, we observed a noteworthy reduction in viral RNA levels and inflammation in their lung tissues, suggesting a potential therapeutic effect. Our findings enhance the understanding of quercetin-3-methyl ether as a novel agent against HRV1B, pointing towards promising strategies for managing cold-related illnesses and their complications.
In our experiments, quercetin-3-methyl ether significantly inhibited the replication of HRV1B in a concentration-dependent way, which means that higher doses produced better results. We also found that this compound enhanced early apoptosis—essentially, the process by which infected cells shut down in response to the virus—during the critical early stages of infection. This seemed to counteract HRV1B's tactics to evade the immune response.
Additionally, when we administered quercetin-3-methyl ether to mice infected with HRV1B, we observed a noteworthy reduction in viral RNA levels and inflammation in their lung tissues, suggesting a potential therapeutic effect. Our findings enhance the understanding of quercetin-3-methyl ether as a novel agent against HRV1B, pointing towards promising strategies for managing cold-related illnesses and their complications.
Read More
8
We observed that quercetin, a powerful antioxidant, plays a significant role in helping grapes withstand cold temperatures. In our study, we found that grapes exposed to low temperatures accumulate more quercetin, which in turn enhances their cold resistance.
By applying exogenous quercetin, we noted a marked improvement in the grapes' ability to endure low-temperature stress. Our research revealed that a key gene, VvFLS1, responsible for quercetin synthesis is upregulated when grapes experience cold conditions.
We also discovered that VvbZIP22, a protein that binds to the VvFLS1 promoter, is crucial for mediating this process. When we overexpressed VvbZIP22 in grapes, it resulted in higher levels of quercetin and improved cold resistance, further confirming its pivotal role in the plant's adaptation to harsh environments.
Through these findings, we highlighted the importance of quercetin in enhancing grape survival during cold spells, showcasing a vital link between plant biology and climate resilience.
By applying exogenous quercetin, we noted a marked improvement in the grapes' ability to endure low-temperature stress. Our research revealed that a key gene, VvFLS1, responsible for quercetin synthesis is upregulated when grapes experience cold conditions.
We also discovered that VvbZIP22, a protein that binds to the VvFLS1 promoter, is crucial for mediating this process. When we overexpressed VvbZIP22 in grapes, it resulted in higher levels of quercetin and improved cold resistance, further confirming its pivotal role in the plant's adaptation to harsh environments.
Through these findings, we highlighted the importance of quercetin in enhancing grape survival during cold spells, showcasing a vital link between plant biology and climate resilience.
Read More
User Reviews
USERS' SCORE
Good
Based on 71 Reviews
8.1
- All Reviews
- Positive Reviews
- Negative Reviews
9
Improves colds effect
100 people found this helpful
Quercetin is associated with enhanced exercise performance and reduced inflammation, blood pressure, and blood sugar levels. The typical dose is 500 mg daily. This supplement contains 29 mg of Bio-Quercetin phytosome, equating to 10 mg of quercetin but claims 50 times greater bioavailability. I used it for a cold, and it worked brilliantly. Additionally, I understand it's part of the anti-COVID protocol, so I keep it at home during these challenging times. Stay healthy!
Read More
9
Prevents colds
44 people found this helpful
It works! It keeps me healthy, with no school bus driver colds or sore throats while I take this, or that other bug going around.
Read More
9
Excellent cold relief
5 people found this helpful
Bioquercetin 30 Vegetarian Capsules is an excellent find for immune support. It has aided my recovery from colds and viral illnesses, quickly restoring my strength and alleviating inflammation. The ingredient quality is high, and my respiratory immunity remains superb. Bioquercetin acts as a true antioxidant in combating inflammation. The results are impressive, and it has a lovely taste, making it an essential part of my health regimen.
Read More
9
Effective against cold
3 people found this helpful
This strong quercetin is effective against viruses. I use it at the initial signs of a cold, and typically, by the following day, I feel fine.
Read More
10
No more colds
1 people found this helpful
The capsules are small and seem easily absorbed. Since taking them, I find I no longer catch colds!
Read More
Frequently Asked Questions
9
Effective against cold
3 people found this helpful
This strong quercetin is effective against viruses. I use it at the initial signs of a cold, and typically, by the following day, I feel fine.
9
Effective for cold
I like Quercetin; it is truly effective against cold symptoms. I took it for about a month and noticed benefits for my immune system. However, be cautious and do not take it for too long—only 4-6 weeks. Its small size makes it easy to ingest.
9
Regained strength
Bioquercetin 30 vegetarian capsules is a true find. It greatly aids colds and viral infections. It helped me quickly regain strength after illness and reduce inflammation. The quality of ingredients is high, and respiratory immunity is well-supported. Bioquercetin is a potent antioxidant that effectively combats inflammation. Excellent results and pleasant taste—it has become an essential part of my health regimen.
10
No more colds
1 people found this helpful
The capsules are small and seem easily absorbed. Since taking them, I find I no longer catch colds!
9
Improves colds effect
100 people found this helpful
Quercetin is associated with enhanced exercise performance and reduced inflammation, blood pressure, and blood sugar levels. The typical dose is 500 mg daily. This supplement contains 29 mg of Bio-Quercetin phytosome, equating to 10 mg of quercetin but claims 50 times greater bioavailability. I used it for a cold, and it worked brilliantly. Additionally, I understand it's part of the anti-COVID protocol, so I keep it at home during these challenging times. Stay healthy!
9
Cold and allergy relief
1 people found this helpful
This is my go-to purchase. In case of a cold, quercetin and zinc together are an effective duo for alleviating discomfort and preventing complications. I also use quercetin for seasonal allergies, and it is significantly helpful.
9
High-quality anti-cold remedy
This is a fine product that works superbly when combined with vitamin D, zinc, and vitamin C as an anti-cold remedy. I appreciate the high quality.
7.5
Alleviates cold symptoms
1 people found this helpful
It's beneficial during colds or viral infections. It works quite well, easing inflammation and improving my condition. You might combine it with propolis, monolaurin, cordyceps for COVID, or serrapeptase. Thank you, iHerb! The size, taste of the capsules, and packaging do not bother me; is that the real reason I buy supplements? They have always come well packaged, and these are delicious—difficult to resist!
7.5
Improves immunity
I find this product excellent; it has notably improved our family's immunity, with fewer instances of illness or colds. Quercetin combines with phytosomes, allowing for quick absorption, approximately 50 times more than traditional versions, which helps in strengthening the immune system and reducing oxidative stress.
8
Quercetin limits HRV1B replication
We investigated how quercetin-3-methyl ether, a natural flavonoid, impacts human rhinovirus 1B (HRV1B), which is responsible for the common cold and can worsen conditions like asthma. Our research involved testing this compound in HeLa cells to see if it could reduce viral replication and the damage associated with the virus.
In our experiments, quercetin-3-methyl ether significantly inhibited the replication of HRV1B in a concentration-dependent way, which means that higher doses produced better results. We also found that this compound enhanced early apoptosis—essentially, the process by which infected cells shut down in response to the virus—during the critical early stages of infection. This seemed to counteract HRV1B's tactics to evade the immune response.
Additionally, when we administered quercetin-3-methyl ether to mice infected with HRV1B, we observed a noteworthy reduction in viral RNA levels and inflammation in their lung tissues, suggesting a potential therapeutic effect. Our findings enhance the understanding of quercetin-3-methyl ether as a novel agent against HRV1B, pointing towards promising strategies for managing cold-related illnesses and their complications.
In our experiments, quercetin-3-methyl ether significantly inhibited the replication of HRV1B in a concentration-dependent way, which means that higher doses produced better results. We also found that this compound enhanced early apoptosis—essentially, the process by which infected cells shut down in response to the virus—during the critical early stages of infection. This seemed to counteract HRV1B's tactics to evade the immune response.
Additionally, when we administered quercetin-3-methyl ether to mice infected with HRV1B, we observed a noteworthy reduction in viral RNA levels and inflammation in their lung tissues, suggesting a potential therapeutic effect. Our findings enhance the understanding of quercetin-3-methyl ether as a novel agent against HRV1B, pointing towards promising strategies for managing cold-related illnesses and their complications.
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. 10.4062/biomolther.2024.204
- Liu G, Zhang Z, Tian Y, Yang J, Xu X, et al. VvbZIP22 regulates quercetin synthesis to enhances cold resistance in grape. Plant Sci. 2025;350:112293. 10.1016/j.plantsci.2024.112293
- Otani M, Ishii D, Iwata H, Satake Y, Okada Y, et al. Preservation Efficacy of a Quercetin and Sucrose Solution for Warm Ischemically Damaged Porcine Liver Grafts. Transplant Proc. 2023;55:2212. 10.1016/j.transproceed.2023.07.031
