Last update
5/13/2026
Reviewed By
Overview
SCIENTIFIC SCORE
Moderately Effective
Based on 1 Research
8
USERS' SCORE
Good
Based on 21 Reviews
8.2
Supplement Facts
Serving Size: 1 Vegetarian Tablet
Amount Per Serving
%DV
Vitamin C (as ascorbic acid)
1000 mg
1111%
Bio-Quercetin® Proprietary Blend[providing 35% quercetin (5 mg) [from Japanese sophora concentrate (flower bud)],30% galactomannans (4 mg) [from fenugreek (seed)]
15 mg
**
Top Medical Research Studies
8
We conducted a thorough evaluation of how vitamin C, when combined with pleuran, impacts asthma control and respiratory issues in children suffering from perennial asthma. The study was meticulously designed as a double-blind, placebo-controlled trial involving 230 children aged 7 to 17 years. This means that neither the participants nor the researchers knew who was receiving the active treatment or the placebo, ensuring the findings were reliable.
The results were promising, especially for children under 12 years. They showed significant improvements in asthma control compared to those receiving only the placebo treatment. Meanwhile, older children (12 years and above) experienced fewer respiratory infections with the combination treatment. Overall, by the end of the 48 weeks, a majority of children on the pleuran and vitamin C treatment reported better asthma control compared to those on the placebo.
While the combination of pleuran and vitamin C was indeed beneficial for managing asthma, we must note that the study did not specifically isolate the effect of vitamin C alone on allergies or asthma. Thus, it is hard to draw definitive conclusions about vitamin C's effectiveness independently from pleuran. However, the approach suggested that using these supplements together could offer a helpful boost in managing asthma symptoms.
The results were promising, especially for children under 12 years. They showed significant improvements in asthma control compared to those receiving only the placebo treatment. Meanwhile, older children (12 years and above) experienced fewer respiratory infections with the combination treatment. Overall, by the end of the 48 weeks, a majority of children on the pleuran and vitamin C treatment reported better asthma control compared to those on the placebo.
While the combination of pleuran and vitamin C was indeed beneficial for managing asthma, we must note that the study did not specifically isolate the effect of vitamin C alone on allergies or asthma. Thus, it is hard to draw definitive conclusions about vitamin C's effectiveness independently from pleuran. However, the approach suggested that using these supplements together could offer a helpful boost in managing asthma symptoms.
Read More
Most Useful Reviews
9
Immunity support
50 people found this helpful
A great product of very good quality. The composition is excellent and easily digestible, without causing discomfort. I can finally take vitamin C without my stomach reacting. My family takes it each morning for immunity. Highly recommend, especially in autumn!
Read More
9
Effective for allergies
3 people found this helpful
One of the best vitamin Cs, particularly beneficial due to the quercetin it contains. I take it alongside other supplements, and it's been fantastic throughout the pandemic. As an allergy sufferer, it suits me perfectly.
Read More
9
No drowsy side effects
3 people found this helpful
Natural method to combat seasonal allergies. My holistic doctor recommended this for my seasonal allergies, and it really works! No more drowsy side effects! I love this!
Read More
Medical Researches
SCIENTIFIC SCORE
Moderately Effective
Based on 1 Research
8
- All Researches
8
We conducted a thorough evaluation of how vitamin C, when combined with pleuran, impacts asthma control and respiratory issues in children suffering from perennial asthma. The study was meticulously designed as a double-blind, placebo-controlled trial involving 230 children aged 7 to 17 years. This means that neither the participants nor the researchers knew who was receiving the active treatment or the placebo, ensuring the findings were reliable.
The results were promising, especially for children under 12 years. They showed significant improvements in asthma control compared to those receiving only the placebo treatment. Meanwhile, older children (12 years and above) experienced fewer respiratory infections with the combination treatment. Overall, by the end of the 48 weeks, a majority of children on the pleuran and vitamin C treatment reported better asthma control compared to those on the placebo.
While the combination of pleuran and vitamin C was indeed beneficial for managing asthma, we must note that the study did not specifically isolate the effect of vitamin C alone on allergies or asthma. Thus, it is hard to draw definitive conclusions about vitamin C's effectiveness independently from pleuran. However, the approach suggested that using these supplements together could offer a helpful boost in managing asthma symptoms.
The results were promising, especially for children under 12 years. They showed significant improvements in asthma control compared to those receiving only the placebo treatment. Meanwhile, older children (12 years and above) experienced fewer respiratory infections with the combination treatment. Overall, by the end of the 48 weeks, a majority of children on the pleuran and vitamin C treatment reported better asthma control compared to those on the placebo.
While the combination of pleuran and vitamin C was indeed beneficial for managing asthma, we must note that the study did not specifically isolate the effect of vitamin C alone on allergies or asthma. Thus, it is hard to draw definitive conclusions about vitamin C's effectiveness independently from pleuran. However, the approach suggested that using these supplements together could offer a helpful boost in managing asthma symptoms.
Read More
User Reviews
USERS' SCORE
Good
Based on 21 Reviews
8.2
- All Reviews
- Positive Reviews
- Negative Reviews
9
Immunity support
50 people found this helpful
A great product of very good quality. The composition is excellent and easily digestible, without causing discomfort. I can finally take vitamin C without my stomach reacting. My family takes it each morning for immunity. Highly recommend, especially in autumn!
Read More
9
Effective for allergies
3 people found this helpful
One of the best vitamin Cs, particularly beneficial due to the quercetin it contains. I take it alongside other supplements, and it's been fantastic throughout the pandemic. As an allergy sufferer, it suits me perfectly.
Read More
9
No drowsy side effects
3 people found this helpful
Natural method to combat seasonal allergies. My holistic doctor recommended this for my seasonal allergies, and it really works! No more drowsy side effects! I love this!
Read More
9
Effective defence
1 people found this helpful
Life Extension Vitamin C and Bio-Quercetin have become essential in my daily routine. The combination effectively boosts immunity and provides a great defence against allergies.
Read More
9
Well tolerated
1 people found this helpful
Excellent! This vitamin C with quercetin is well tolerated by my whole family, and it effectively helps with our allergies.
Read More
Frequently Asked Questions
9
Calms nasal allergies
I learned that quercetin is beneficial for allergies, and it has significantly eased my nasal issues caused by dust. The 1000 mg in one tablet is easily absorbed.
9
Effective defence
1 people found this helpful
Life Extension Vitamin C and Bio-Quercetin have become essential in my daily routine. The combination effectively boosts immunity and provides a great defence against allergies.
9
Effective for allergies
3 people found this helpful
One of the best vitamin Cs, particularly beneficial due to the quercetin it contains. I take it alongside other supplements, and it's been fantastic throughout the pandemic. As an allergy sufferer, it suits me perfectly.
References
- Jesenak M, Hrubisko M, Chudek J, Bystron J, Rennerova Z, et al. Beneficial effects of pleuran on asthma control and respiratory tract-infection frequency in children with perennial asthma. Sci Rep. 2025;15:7146. 10.1038/s41598-025-91830-2
