Last update
8/17/2026
Reviewed By
Overview
SCIENTIFIC SCORE
Moderately Effective
Based on 2 Researches
8.5
USERS' SCORE
Good
Based on 10 Reviews
8.4
Supplement Facts
Serving Size: 2 VegCaps
Amount Per Serving
%DV
Vitamin C (as Ascorbic Acid)
1,235 mg
1,372%
Quercetin
465 mg
*
Bromelain (Supplying 90 MCU)
50 mg
*
Top Medical Research Studies
8
We uncovered how quercetin, alongside a specialized compound called PSFL2915, affects chronic cough by interacting with a specific part of a receptor known as P2X3.
Our tests showed that quercetin could effectively reduce coughing in male mice and guinea pigs without causing taste disturbances—a drawback seen with other similar medications.
This suggests that quercetin could be a promising alternative to existing treatments for chronic cough, offering a potential new avenue for relief.
Our tests showed that quercetin could effectively reduce coughing in male mice and guinea pigs without causing taste disturbances—a drawback seen with other similar medications.
This suggests that quercetin could be a promising alternative to existing treatments for chronic cough, offering a potential new avenue for relief.
Read More
9
We explored whether quercetin, a compound derived from medicinal plants, affects coughing by relaxing airway smooth muscles. By conducting experiments with guinea pig tracheal rings, we found that quercetin effectively reduced contractions triggered by various stimulants. It worked by blocking specific calcium channels that are critical for muscle contraction.
However, the study mainly focused on the physiological mechanisms rather than directly measuring cough relief in humans. While quercetin shows promising properties in muscle relaxation, more research is needed to evaluate its direct impact on cough in clinical settings.
However, the study mainly focused on the physiological mechanisms rather than directly measuring cough relief in humans. While quercetin shows promising properties in muscle relaxation, more research is needed to evaluate its direct impact on cough in clinical settings.
Read More
Most Useful Reviews
9
Effective for children
Very good! Nasal congestion has improved significantly for my children when they take it morning and evening along with C and pine bark. It is effective for them; otherwise, they would cough all day and suffer nasal congestion year-round. I feel so distressed about this.
Read More
9
Improves lung function
The ingredients and proportions are excellent. After some time, I feel my lungs are better than before; I no longer cough, and my immunity has also improved.
Read More
9
Chronic cough relief
3 people found this helpful
An excellent complex for allergies and viral illnesses. It successfully relieved my chronic cough. Additionally, we give it to children at the onset of colds, and it helps them recover faster.
Read More
Medical Researches
SCIENTIFIC SCORE
Moderately Effective
Based on 2 Researches
8.5
- All Researches
9
We explored whether quercetin, a compound derived from medicinal plants, affects coughing by relaxing airway smooth muscles. By conducting experiments with guinea pig tracheal rings, we found that quercetin effectively reduced contractions triggered by various stimulants. It worked by blocking specific calcium channels that are critical for muscle contraction.
However, the study mainly focused on the physiological mechanisms rather than directly measuring cough relief in humans. While quercetin shows promising properties in muscle relaxation, more research is needed to evaluate its direct impact on cough in clinical settings.
However, the study mainly focused on the physiological mechanisms rather than directly measuring cough relief in humans. While quercetin shows promising properties in muscle relaxation, more research is needed to evaluate its direct impact on cough in clinical settings.
Read More
8
We uncovered how quercetin, alongside a specialized compound called PSFL2915, affects chronic cough by interacting with a specific part of a receptor known as P2X3.
Our tests showed that quercetin could effectively reduce coughing in male mice and guinea pigs without causing taste disturbances—a drawback seen with other similar medications.
This suggests that quercetin could be a promising alternative to existing treatments for chronic cough, offering a potential new avenue for relief.
Our tests showed that quercetin could effectively reduce coughing in male mice and guinea pigs without causing taste disturbances—a drawback seen with other similar medications.
This suggests that quercetin could be a promising alternative to existing treatments for chronic cough, offering a potential new avenue for relief.
Read More
User Reviews
USERS' SCORE
Good
Based on 10 Reviews
8.4
- All Reviews
- Positive Reviews
- Negative Reviews
9
Effective for children
Very good! Nasal congestion has improved significantly for my children when they take it morning and evening along with C and pine bark. It is effective for them; otherwise, they would cough all day and suffer nasal congestion year-round. I feel so distressed about this.
Read More
9
Improves lung function
The ingredients and proportions are excellent. After some time, I feel my lungs are better than before; I no longer cough, and my immunity has also improved.
Read More
9
Chronic cough relief
3 people found this helpful
An excellent complex for allergies and viral illnesses. It successfully relieved my chronic cough. Additionally, we give it to children at the onset of colds, and it helps them recover faster.
Read More
9
Congestion stop
1 people found this helpful
I experience coughing or congestion at random moments, possibly due to allergies. My symptoms cease when I take QBC regularly. I truly love this product!
Read More
9
Phlegm reduction
After some time taking it, I find it very effective. My cough has significantly improved, and I have less phlegm. The quercetin also contains vitamin C, known for its anti-inflammatory properties. It’s worth taking.
Read More
Frequently Asked Questions
9
Phlegm reduction
After some time taking it, I find it very effective. My cough has significantly improved, and I have less phlegm. The quercetin also contains vitamin C, known for its anti-inflammatory properties. It’s worth taking.
9
Chronic cough relief
3 people found this helpful
An excellent complex for allergies and viral illnesses. It successfully relieved my chronic cough. Additionally, we give it to children at the onset of colds, and it helps them recover faster.
9
Improves lung function
The ingredients and proportions are excellent. After some time, I feel my lungs are better than before; I no longer cough, and my immunity has also improved.
9
Children's recovery
I’ve purchased three jars! It helps with allergy flare-ups and eliminates my children's allergic cough. I consider it a fantastic product, ensuring they recover faster at the first sign of a cold.
8
We uncovered how quercetin, alongside a specialized compound called PSFL2915, affects chronic cough by interacting with a specific part of a receptor known as P2X3.
Our tests showed that quercetin could effectively reduce coughing in male mice and guinea pigs without causing taste disturbances—a drawback seen with other similar medications.
This suggests that quercetin could be a promising alternative to existing treatments for chronic cough, offering a potential new avenue for relief.
Our tests showed that quercetin could effectively reduce coughing in male mice and guinea pigs without causing taste disturbances—a drawback seen with other similar medications.
This suggests that quercetin could be a promising alternative to existing treatments for chronic cough, offering a potential new avenue for relief.
9
We explored whether quercetin, a compound derived from medicinal plants, affects coughing by relaxing airway smooth muscles. By conducting experiments with guinea pig tracheal rings, we found that quercetin effectively reduced contractions triggered by various stimulants. It worked by blocking specific calcium channels that are critical for muscle contraction.
However, the study mainly focused on the physiological mechanisms rather than directly measuring cough relief in humans. While quercetin shows promising properties in muscle relaxation, more research is needed to evaluate its direct impact on cough in clinical settings.
However, the study mainly focused on the physiological mechanisms rather than directly measuring cough relief in humans. While quercetin shows promising properties in muscle relaxation, more research is needed to evaluate its direct impact on cough in clinical settings.
References
- Flores-Soto E, Romero-Martínez BS, Solís-Chagoyán H, Estrella-Parra EA, Avila-Acevedo JG, et al. and Its Active Compound Quercetin as Ca Inhibitors in the Contraction of Airway Smooth Muscle. Molecules. 2024;29. 10.3390/molecules29102284
- Guo CR, Zhang ZZ, Zhou X, Sun MY, Li TT, et al. Chronic cough relief by allosteric modulation of P2X3 without taste disturbance. Nat Commun. 2023;14:5844. 10.1038/s41467-023-41495-0
