Overview
SCIENTIFIC SCORE
Moderately Effective
Based on 2 Researches
8
USERS' SCORE
Good
Based on 265 Reviews
8
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
7
Effectiveness of Vitamin C on Colds
We explored the effects of vitamin C on the common cold and pneumonia by examining a range of studies. Interestingly, research on animals suggests that vitamin C may have protective effects against infections. However, when it comes to preventing colds in the general population, taking more than 1 gram of vitamin C per day didn’t show significant benefits.
But there's a twist! Participants engaged in heavy physical activities saw their cold incidence reduced by half with vitamin C supplementation. Additionally, regular intake of 1 gram or more daily was linked to a 15% decrease in cold severity. While some therapeutic trials showed inconsistent results when vitamin C was taken after cold symptoms appeared, two studies did indicate that larger doses (6-8 grams per day) could effectively shorten the duration of colds compared to lower doses.
Our investigation also looked into pneumonia, but the studies were conducted in unique settings, such as a boarding school and military recruits. This makes it hard to generalize the findings to the wider population. Yet, some trials suggested benefits for pneumonia patients. Finally, the role of vitamin C in treating COVID-19 and sepsis remains unclear, with mixed results.
Given that vitamin C seems to alleviate symptoms and shorten the duration of colds, while being safe and affordable, it might be worth considering a dose of 6-8 grams per day to see if it helps at an individual level.
But there's a twist! Participants engaged in heavy physical activities saw their cold incidence reduced by half with vitamin C supplementation. Additionally, regular intake of 1 gram or more daily was linked to a 15% decrease in cold severity. While some therapeutic trials showed inconsistent results when vitamin C was taken after cold symptoms appeared, two studies did indicate that larger doses (6-8 grams per day) could effectively shorten the duration of colds compared to lower doses.
Our investigation also looked into pneumonia, but the studies were conducted in unique settings, such as a boarding school and military recruits. This makes it hard to generalize the findings to the wider population. Yet, some trials suggested benefits for pneumonia patients. Finally, the role of vitamin C in treating COVID-19 and sepsis remains unclear, with mixed results.
Given that vitamin C seems to alleviate symptoms and shorten the duration of colds, while being safe and affordable, it might be worth considering a dose of 6-8 grams per day to see if it helps at an individual level.
Read More
9
We explored the effects of ascorbic acid, commonly known as vitamin C, on cold tolerance in tomato seedlings. In our study, we discovered that applying vitamin C significantly boosts the seedlings' ability to handle cold stress.
By enhancing the antioxidant defense system, vitamin C treatment increased the enzyme activity in the seedlings' leaves. Additionally, it raised levels of important compounds such as proline, sugar, and abscisic acid, all of which play crucial roles in plant stress responses.
Our observations showed that vitamin C also protects the photosynthesis system of tomato seedlings. This implies that it helps maintain chlorophyll function, which is critical for the plant's overall health, especially under cold conditions.
Moreover, we found that vitamin C treatments led to increased expression of genes linked to antioxidant enzymes and cold response mechanisms. Overall, our findings suggest that exogenous vitamin C is a beneficial approach to improve cold tolerance in tomatoes and may provide helpful insights for farmers looking to cultivate hardier varieties during colder months.
By enhancing the antioxidant defense system, vitamin C treatment increased the enzyme activity in the seedlings' leaves. Additionally, it raised levels of important compounds such as proline, sugar, and abscisic acid, all of which play crucial roles in plant stress responses.
Our observations showed that vitamin C also protects the photosynthesis system of tomato seedlings. This implies that it helps maintain chlorophyll function, which is critical for the plant's overall health, especially under cold conditions.
Moreover, we found that vitamin C treatments led to increased expression of genes linked to antioxidant enzymes and cold response mechanisms. Overall, our findings suggest that exogenous vitamin C is a beneficial approach to improve cold tolerance in tomatoes and may provide helpful insights for farmers looking to cultivate hardier varieties during colder months.
Read More
Most Useful Reviews
7.5
Prevents cold progress
140 people found this helpful
A fantastic choice for vitamin C. I typically purchase various types, but I particularly favour those with bioflavonoids. Not all ascorbic acid is effective, yet this one with bioquercetin clearly shows results. If I feel a cold coming on, taking a loading dose of this vitamin C can halt the onset of illness. My herpes clears up within a day. The tablets are small and easy to split. If you appreciate reviews or enjoy contributing to others, you can earn rewards for new purchases on iHerb, providing extra savings.
Read More
9
Cold bypassed easily
82 people found this helpful
Excellent formulation! This vitamin C is among the finest on the site, combined with phytosomes of quercetin that combat viruses impacting the upper respiratory tract. I take it when symptoms arise, such as a sore throat and weakness. I find that one pill daily, over about a week, helps me sidestep a cold. If I do fall ill, like in 2020, it's usually mild with just a slight fever. I feel more secure knowing this remedy aids in my recovery. The price is reasonable, and there are various quantities available.
Read More
7.5
Highly effective choice
18 people found this helpful
One of my favourites! A superb option for vitamin C. I generally buy various types, particularly enjoying those with bioflavonoids. Not every form of ascorbic acid proves effective, but this one with bioquercetin is noticeable. If I catch a cold, taking this vitamin C can prevent the illness from developing when I use a loading dose. My herpes clears in a day. The tablets are easily halved, providing additional convenience.
Read More
Medical Researches
SCIENTIFIC SCORE
Moderately Effective
Based on 2 Researches
8
- All Researches
9
We explored the effects of ascorbic acid, commonly known as vitamin C, on cold tolerance in tomato seedlings. In our study, we discovered that applying vitamin C significantly boosts the seedlings' ability to handle cold stress.
By enhancing the antioxidant defense system, vitamin C treatment increased the enzyme activity in the seedlings' leaves. Additionally, it raised levels of important compounds such as proline, sugar, and abscisic acid, all of which play crucial roles in plant stress responses.
Our observations showed that vitamin C also protects the photosynthesis system of tomato seedlings. This implies that it helps maintain chlorophyll function, which is critical for the plant's overall health, especially under cold conditions.
Moreover, we found that vitamin C treatments led to increased expression of genes linked to antioxidant enzymes and cold response mechanisms. Overall, our findings suggest that exogenous vitamin C is a beneficial approach to improve cold tolerance in tomatoes and may provide helpful insights for farmers looking to cultivate hardier varieties during colder months.
By enhancing the antioxidant defense system, vitamin C treatment increased the enzyme activity in the seedlings' leaves. Additionally, it raised levels of important compounds such as proline, sugar, and abscisic acid, all of which play crucial roles in plant stress responses.
Our observations showed that vitamin C also protects the photosynthesis system of tomato seedlings. This implies that it helps maintain chlorophyll function, which is critical for the plant's overall health, especially under cold conditions.
Moreover, we found that vitamin C treatments led to increased expression of genes linked to antioxidant enzymes and cold response mechanisms. Overall, our findings suggest that exogenous vitamin C is a beneficial approach to improve cold tolerance in tomatoes and may provide helpful insights for farmers looking to cultivate hardier varieties during colder months.
Read More
7
Effectiveness of Vitamin C on Colds
We explored the effects of vitamin C on the common cold and pneumonia by examining a range of studies. Interestingly, research on animals suggests that vitamin C may have protective effects against infections. However, when it comes to preventing colds in the general population, taking more than 1 gram of vitamin C per day didn’t show significant benefits.
But there's a twist! Participants engaged in heavy physical activities saw their cold incidence reduced by half with vitamin C supplementation. Additionally, regular intake of 1 gram or more daily was linked to a 15% decrease in cold severity. While some therapeutic trials showed inconsistent results when vitamin C was taken after cold symptoms appeared, two studies did indicate that larger doses (6-8 grams per day) could effectively shorten the duration of colds compared to lower doses.
Our investigation also looked into pneumonia, but the studies were conducted in unique settings, such as a boarding school and military recruits. This makes it hard to generalize the findings to the wider population. Yet, some trials suggested benefits for pneumonia patients. Finally, the role of vitamin C in treating COVID-19 and sepsis remains unclear, with mixed results.
Given that vitamin C seems to alleviate symptoms and shorten the duration of colds, while being safe and affordable, it might be worth considering a dose of 6-8 grams per day to see if it helps at an individual level.
But there's a twist! Participants engaged in heavy physical activities saw their cold incidence reduced by half with vitamin C supplementation. Additionally, regular intake of 1 gram or more daily was linked to a 15% decrease in cold severity. While some therapeutic trials showed inconsistent results when vitamin C was taken after cold symptoms appeared, two studies did indicate that larger doses (6-8 grams per day) could effectively shorten the duration of colds compared to lower doses.
Our investigation also looked into pneumonia, but the studies were conducted in unique settings, such as a boarding school and military recruits. This makes it hard to generalize the findings to the wider population. Yet, some trials suggested benefits for pneumonia patients. Finally, the role of vitamin C in treating COVID-19 and sepsis remains unclear, with mixed results.
Given that vitamin C seems to alleviate symptoms and shorten the duration of colds, while being safe and affordable, it might be worth considering a dose of 6-8 grams per day to see if it helps at an individual level.
Read More
User Reviews
USERS' SCORE
Good
Based on 265 Reviews
8
- All Reviews
- Positive Reviews
- Negative Reviews
7.5
Prevents cold progress
140 people found this helpful
A fantastic choice for vitamin C. I typically purchase various types, but I particularly favour those with bioflavonoids. Not all ascorbic acid is effective, yet this one with bioquercetin clearly shows results. If I feel a cold coming on, taking a loading dose of this vitamin C can halt the onset of illness. My herpes clears up within a day. The tablets are small and easy to split. If you appreciate reviews or enjoy contributing to others, you can earn rewards for new purchases on iHerb, providing extra savings.
Read More
9
Cold bypassed easily
82 people found this helpful
Excellent formulation! This vitamin C is among the finest on the site, combined with phytosomes of quercetin that combat viruses impacting the upper respiratory tract. I take it when symptoms arise, such as a sore throat and weakness. I find that one pill daily, over about a week, helps me sidestep a cold. If I do fall ill, like in 2020, it's usually mild with just a slight fever. I feel more secure knowing this remedy aids in my recovery. The price is reasonable, and there are various quantities available.
Read More
7.5
Highly effective choice
18 people found this helpful
One of my favourites! A superb option for vitamin C. I generally buy various types, particularly enjoying those with bioflavonoids. Not every form of ascorbic acid proves effective, but this one with bioquercetin is noticeable. If I catch a cold, taking this vitamin C can prevent the illness from developing when I use a loading dose. My herpes clears in a day. The tablets are easily halved, providing additional convenience.
Read More
10
Effective immunity aid
4 people found this helpful
I’ve tried numerous vitamin C forms, but this product stands out as the most effective. I haven’t caught a cold in a year since I began taking it. I believe it bolsters my immunity. I take it twice daily, though it can be a bit difficult to swallow.
Read More
10
Cures cold symptoms
3 people found this helpful
What a discovery! I ordered this miracle vitamin on a friend's advice after doubts about spending money on vitamins. I lead an active, healthy lifestyle, yet coughs often plagued me. When I caught a cold, I immediately took vitamin C and zinc, and by morning, symptoms vanished. Now, every time I feel unwell, I use these and the cold disappears. For five months, I've not worried about catching a cold, feeling fantastic, with the whole family now using them.
Read More
Frequently Asked Questions
10
Cures cold symptoms
3 people found this helpful
What a discovery! I ordered this miracle vitamin on a friend's advice after doubts about spending money on vitamins. I lead an active, healthy lifestyle, yet coughs often plagued me. When I caught a cold, I immediately took vitamin C and zinc, and by morning, symptoms vanished. Now, every time I feel unwell, I use these and the cold disappears. For five months, I've not worried about catching a cold, feeling fantastic, with the whole family now using them.
10
Cold symptoms vanish
With it, all the symptoms of a cold disappear from the first day if you drink 1000 mg as soon as you feel unwell!
9
Cold bypassed easily
82 people found this helpful
Excellent formulation! This vitamin C is among the finest on the site, combined with phytosomes of quercetin that combat viruses impacting the upper respiratory tract. I take it when symptoms arise, such as a sore throat and weakness. I find that one pill daily, over about a week, helps me sidestep a cold. If I do fall ill, like in 2020, it's usually mild with just a slight fever. I feel more secure knowing this remedy aids in my recovery. The price is reasonable, and there are various quantities available.
10
Effective immunity aid
4 people found this helpful
I’ve tried numerous vitamin C forms, but this product stands out as the most effective. I haven’t caught a cold in a year since I began taking it. I believe it bolsters my immunity. I take it twice daily, though it can be a bit difficult to swallow.
8
Family protection
1 people found this helpful
We have been taking this for two years as a family during autumn and winter. My daughter, aged 10, takes a quarter and adults take half or a whole depending on circumstances. It protects us from colds, and if we do get one, we recover quickly. I believe these vitamins yield positive results. Here’s to our health!
9
Seasonal defence
1 people found this helpful
These vitamins helped me through the harsh Russian winter! The combination of vitamins C, ZN, D, and K has never let me down. Trying Life Extension for the first time left me pleased—feeling energetic in the morning, having good sleep, food, and mood during this biting cold period in Russia!
7
Effectiveness of Vitamin C on Colds
We explored the effects of vitamin C on the common cold and pneumonia by examining a range of studies. Interestingly, research on animals suggests that vitamin C may have protective effects against infections. However, when it comes to preventing colds in the general population, taking more than 1 gram of vitamin C per day didn’t show significant benefits.
But there's a twist! Participants engaged in heavy physical activities saw their cold incidence reduced by half with vitamin C supplementation. Additionally, regular intake of 1 gram or more daily was linked to a 15% decrease in cold severity. While some therapeutic trials showed inconsistent results when vitamin C was taken after cold symptoms appeared, two studies did indicate that larger doses (6-8 grams per day) could effectively shorten the duration of colds compared to lower doses.
Our investigation also looked into pneumonia, but the studies were conducted in unique settings, such as a boarding school and military recruits. This makes it hard to generalize the findings to the wider population. Yet, some trials suggested benefits for pneumonia patients. Finally, the role of vitamin C in treating COVID-19 and sepsis remains unclear, with mixed results.
Given that vitamin C seems to alleviate symptoms and shorten the duration of colds, while being safe and affordable, it might be worth considering a dose of 6-8 grams per day to see if it helps at an individual level.
But there's a twist! Participants engaged in heavy physical activities saw their cold incidence reduced by half with vitamin C supplementation. Additionally, regular intake of 1 gram or more daily was linked to a 15% decrease in cold severity. While some therapeutic trials showed inconsistent results when vitamin C was taken after cold symptoms appeared, two studies did indicate that larger doses (6-8 grams per day) could effectively shorten the duration of colds compared to lower doses.
Our investigation also looked into pneumonia, but the studies were conducted in unique settings, such as a boarding school and military recruits. This makes it hard to generalize the findings to the wider population. Yet, some trials suggested benefits for pneumonia patients. Finally, the role of vitamin C in treating COVID-19 and sepsis remains unclear, with mixed results.
Given that vitamin C seems to alleviate symptoms and shorten the duration of colds, while being safe and affordable, it might be worth considering a dose of 6-8 grams per day to see if it helps at an individual level.
References
- Hemilä H, Chalker E. Vitamin C for the common cold and pneumonia. Pol Arch Intern Med. 2025;135. doi:10.20452/pamw.16926
- Wang X, Ran C, Fu Y, Han L, Yang X, et al. Application of Exogenous Ascorbic Acid Enhances Cold Tolerance in Tomato Seedlings through Molecular and Physiological Responses. Int J Mol Sci. 2024;25. doi:10.3390/ijms251810093
