Last update
5/6/2026
Reviewed By
Overview
SCIENTIFIC SCORE
Moderately Effective
Based on 1 Research
8
USERS' SCORE
Good
Based on 11 Reviews
8.7
Supplement Facts
Serving Size: 1 Vegetarian Capsule
Amount Per Serving
%DV
Vitamin C (from ascorbic acid, camu-camu berry extract)
30 mg
33%
Quercetin (as quercetin dihydrate)
250 mg
**
Optimized Food Blend[onion (bulb) (extracts), bitter orange bioflavonoids (peel and fruit), apple (fruit)
220 mg
**
Camu-camu extract (wildcrafted berry)
50 mg
**
Top Medical Research Studies
8
We examined how quercetin, a natural compound, can help alleviate chronic cough by targeting P2X3 receptors, which are involved in cough reflexes. The study involved testing its effects on male mice and guinea pigs.
Results showed that quercetin effectively modulated these receptors without causing adverse taste effects, unlike other drugs like gefapixant. This potential opens up new avenues for treating chronic cough without unpleasant side effects.
Results showed that quercetin effectively modulated these receptors without causing adverse taste effects, unlike other drugs like gefapixant. This potential opens up new avenues for treating chronic cough without unpleasant side effects.
Read More
Most Useful Reviews
9
Increased energy
204 people found this helpful
I have increased energy and strength. After two weeks of taking this, my shortness of breath finally vanished; now I can walk and talk quickly without choking! This Quercetin has greatly improved my immunity, alleviating pain, and I’ve noticed relief from chronic rhinitis—my runny nose no longer torments me!
Read More
9
Faster healing
6 people found this helpful
Cheaper and faster! Buying from iherb was much more economical. As a post-Covid patient, I sought this after reading about its efficacy in lung healing. I started taking it after finishing my 14-day quarantine, and now I can breathe deeply without coughing.
Read More
9
Cough vanished
2 people found this helpful
Excellent! After struggling with a cough post-Covid, I tried numerous remedies without success until I tried quercetin. After taking two capsules daily, my chronic cough began to fade, and breathing became easier—all thanks to quercetin.
Read More
Medical Researches
SCIENTIFIC SCORE
Moderately Effective
Based on 1 Research
8
- All Researches
8
We examined how quercetin, a natural compound, can help alleviate chronic cough by targeting P2X3 receptors, which are involved in cough reflexes. The study involved testing its effects on male mice and guinea pigs.
Results showed that quercetin effectively modulated these receptors without causing adverse taste effects, unlike other drugs like gefapixant. This potential opens up new avenues for treating chronic cough without unpleasant side effects.
Results showed that quercetin effectively modulated these receptors without causing adverse taste effects, unlike other drugs like gefapixant. This potential opens up new avenues for treating chronic cough without unpleasant side effects.
Read More
User Reviews
USERS' SCORE
Good
Based on 11 Reviews
8.7
- All Reviews
- Positive Reviews
- Negative Reviews
9
Increased energy
204 people found this helpful
I have increased energy and strength. After two weeks of taking this, my shortness of breath finally vanished; now I can walk and talk quickly without choking! This Quercetin has greatly improved my immunity, alleviating pain, and I’ve noticed relief from chronic rhinitis—my runny nose no longer torments me!
Read More
9
Faster healing
6 people found this helpful
Cheaper and faster! Buying from iherb was much more economical. As a post-Covid patient, I sought this after reading about its efficacy in lung healing. I started taking it after finishing my 14-day quarantine, and now I can breathe deeply without coughing.
Read More
9
Cough vanished
2 people found this helpful
Excellent! After struggling with a cough post-Covid, I tried numerous remedies without success until I tried quercetin. After taking two capsules daily, my chronic cough began to fade, and breathing became easier—all thanks to quercetin.
Read More
9
Cough improvement
I have been buying this for my mother-in-law for years, who suffers from chronic bronchitis. After using quercetin along with other medications, her chronic cough has nearly disappeared, and her allergy symptoms have significantly reduced. The antioxidant properties of quercetin provide numerous health benefits.
Read More
7.5
Reduced sneezing
1 people found this helpful
It has a noticeable relieving effect on my child's allergic rhinitis. Although not for children, I purchased it as I noticed fewer symptoms with nightly sneezing. My child also hasn't developed a chronic cough despite recent infections at school. Overall, there are many benefits, and I plan to continue for over six months.
Read More
Frequently Asked Questions
9
Increased energy
204 people found this helpful
I have increased energy and strength. After two weeks of taking this, my shortness of breath finally vanished; now I can walk and talk quickly without choking! This Quercetin has greatly improved my immunity, alleviating pain, and I’ve noticed relief from chronic rhinitis—my runny nose no longer torments me!
9
Faster healing
6 people found this helpful
Cheaper and faster! Buying from iherb was much more economical. As a post-Covid patient, I sought this after reading about its efficacy in lung healing. I started taking it after finishing my 14-day quarantine, and now I can breathe deeply without coughing.
9
Cough improvement
I have been buying this for my mother-in-law for years, who suffers from chronic bronchitis. After using quercetin along with other medications, her chronic cough has nearly disappeared, and her allergy symptoms have significantly reduced. The antioxidant properties of quercetin provide numerous health benefits.
9
Allergy relief
Quercetin has natural antihistamine and anti-inflammatory properties that helped my allergies and asthma. After a month of taking it daily, my husband’s allergic cough has disappeared, and his condition has improved.
9
Cough vanished
2 people found this helpful
Excellent! After struggling with a cough post-Covid, I tried numerous remedies without success until I tried quercetin. After taking two capsules daily, my chronic cough began to fade, and breathing became easier—all thanks to quercetin.
8
We examined how quercetin, a natural compound, can help alleviate chronic cough by targeting P2X3 receptors, which are involved in cough reflexes. The study involved testing its effects on male mice and guinea pigs.
Results showed that quercetin effectively modulated these receptors without causing adverse taste effects, unlike other drugs like gefapixant. This potential opens up new avenues for treating chronic cough without unpleasant side effects.
Results showed that quercetin effectively modulated these receptors without causing adverse taste effects, unlike other drugs like gefapixant. This potential opens up new avenues for treating chronic cough without unpleasant side effects.
References
- 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
