Last update
3/7/2026
Reviewed By
Overview
SCIENTIFIC SCORE
Possibly Effective
Based on 13 Researches
7
USERS' SCORE
Good
Based on 2 Reviews
8.6
Supplement Facts
Serving Size: 1/2 Level Teaspoon (approx. 1.9 g)
Amount Per Serving
%DV
Vitamin C (from Sodium Ascorbate)
1.67 g (1,670 mg
1856%
Sodium (from Sodium Ascorbate)
210 mg
9%
Top Medical Research Studies
8
Vitamin C's potential benefits highlighted
We assessed the longstanding debate about vitamin C’s effectiveness in treating the common cold. This exploration reveals that evidence has consistently indicated that vitamin C can indeed help reduce the duration and severity of cold symptoms in certain circumstances.
However, despite this evidence, mainstream medicine has often favored what we call eminence-based medicine, relying on influential figures rather than empirical data. The skepticism surrounding vitamin C largely traces back to three pivotal studies published in 1975, two in JAMA and one in the American Journal of Medicine. These studies have shaped the narrative in textbooks and nutritional guidelines, despite exhibiting notable flaws that we carefully examined.
Furthermore, we highlighted misleading reporting in recent randomized trials and critical editorials published in JAMA regarding vitamin C. While our critique largely focuses on this journal, it reflects a broader trend across medical literature, indicating a possible bias against acknowledging the benefits of vitamin C in fighting colds.
However, despite this evidence, mainstream medicine has often favored what we call eminence-based medicine, relying on influential figures rather than empirical data. The skepticism surrounding vitamin C largely traces back to three pivotal studies published in 1975, two in JAMA and one in the American Journal of Medicine. These studies have shaped the narrative in textbooks and nutritional guidelines, despite exhibiting notable flaws that we carefully examined.
Furthermore, we highlighted misleading reporting in recent randomized trials and critical editorials published in JAMA regarding vitamin C. While our critique largely focuses on this journal, it reflects a broader trend across medical literature, indicating a possible bias against acknowledging the benefits of vitamin C in fighting colds.
Read More
7
We conducted a randomized, double-blind, placebo-controlled trial involving 1,444 Korean Army soldiers to determine if vitamin C supplementation can prevent common colds. Participants were divided into two groups: one receiving 6000 mg of vitamin C daily and the other a placebo.
Our findings revealed that those taking vitamin C had a 20% lower risk of developing a cold. Notably, this benefit was more pronounced among certain subgroups, including never smokers and those in specific training camps.
The evidence suggests that vitamin C could play a role in reducing common colds, potentially informing military health policies for soldiers during training.
Our findings revealed that those taking vitamin C had a 20% lower risk of developing a cold. Notably, this benefit was more pronounced among certain subgroups, including never smokers and those in specific training camps.
The evidence suggests that vitamin C could play a role in reducing common colds, potentially informing military health policies for soldiers during training.
Read More
7
We carried out a double-blind, five-year trial to see how vitamin C supplementation could impact the common cold. A total of 244 participants, diagnosed with atrophic gastritis, were divided into low and high-dose groups receiving either 50 mg or 500 mg of vitamin C daily.
Our findings suggest that vitamin C can significantly reduce how often people catch colds but does not seem to lessen their severity or duration. However, due to some adjustments in the study protocol, we advise caution when interpreting these results.
Our findings suggest that vitamin C can significantly reduce how often people catch colds but does not seem to lessen their severity or duration. However, due to some adjustments in the study protocol, we advise caution when interpreting these results.
Read More
Most Useful Reviews
9
Effective treatment
6 people found this helpful
I bought this vitamin C at my nutritionist's suggestion. Upon sensing a common cold, I take half a teaspoon twice daily. Paired with vitamin D and zinc, I find it remarkably effective—I've avoided the hospital by following this regimen.
Read More
9
Quick recovery
2 people found this helpful
I consider this ascorbate essential in my medicine cabinet. My family takes it at the first sign of a common cold. I give my children a teaspoon's tip, and I take a teaspoon mixed in water if I get ill. It works wonders for recovery.
Read More
Medical Researches
SCIENTIFIC SCORE
Possibly Effective
Based on 13 Researches
7
- All Researches
9
We explored the potential benefits of vitamin C as a supplementary treatment for relieving common cold symptoms. By analyzing data from 10 randomized controlled trials, all focused on patients in China, we sought to understand how combining vitamin C with antiviral therapy might enhance recovery.
Our findings revealed that vitamin C supplementation could significantly improve overall efficacy, with a reported relative risk of 1.27. Moreover, it was shown to shorten the time it takes for symptoms to get better and for patients to heal, compared to antiviral therapy alone.
While vitamin C seems to have a positive impact when paired with antiviral drugs, it’s essential to note that its individual effects might not be fully clear due to the combined treatment approach used in the studies. Nonetheless, vitamin C presents itself as a promising addition to traditional cold treatments, helping patients manage their symptoms more effectively.
Our findings revealed that vitamin C supplementation could significantly improve overall efficacy, with a reported relative risk of 1.27. Moreover, it was shown to shorten the time it takes for symptoms to get better and for patients to heal, compared to antiviral therapy alone.
While vitamin C seems to have a positive impact when paired with antiviral drugs, it’s essential to note that its individual effects might not be fully clear due to the combined treatment approach used in the studies. Nonetheless, vitamin C presents itself as a promising addition to traditional cold treatments, helping patients manage their symptoms more effectively.
Read More
8
We investigated whether taking additional Vitamin C can effectively help treat the common cold.
By examining 9 randomized placebo-controlled trials, we found that extra doses of Vitamin C may reduce the duration of a cold, shorten the time spent indoors, and alleviate symptoms like fever and chills.
Although those who regularly take Vitamin C can still benefit from increased doses at the onset of illness, it’s essential to remember that results can vary from person to person.
By examining 9 randomized placebo-controlled trials, we found that extra doses of Vitamin C may reduce the duration of a cold, shorten the time spent indoors, and alleviate symptoms like fever and chills.
Although those who regularly take Vitamin C can still benefit from increased doses at the onset of illness, it’s essential to remember that results can vary from person to person.
Read More
8
We examined the impact of vitamin C and zinc on the immune system's ability to combat infections. Our findings reaffirm that supplementing with these nutrients can enhance immune responses, leading to improved resistance against respiratory infections, including the common cold.
This is particularly beneficial for those with limited access to these nutrients, including vulnerable populations worldwide. Clinical trials show that sufficient intakes can lessen infection symptoms and duration, supporting overall immune health.
This is particularly beneficial for those with limited access to these nutrients, including vulnerable populations worldwide. Clinical trials show that sufficient intakes can lessen infection symptoms and duration, supporting overall immune health.
Read More
8
Vitamin C's potential benefits highlighted
We assessed the longstanding debate about vitamin C’s effectiveness in treating the common cold. This exploration reveals that evidence has consistently indicated that vitamin C can indeed help reduce the duration and severity of cold symptoms in certain circumstances.
However, despite this evidence, mainstream medicine has often favored what we call eminence-based medicine, relying on influential figures rather than empirical data. The skepticism surrounding vitamin C largely traces back to three pivotal studies published in 1975, two in JAMA and one in the American Journal of Medicine. These studies have shaped the narrative in textbooks and nutritional guidelines, despite exhibiting notable flaws that we carefully examined.
Furthermore, we highlighted misleading reporting in recent randomized trials and critical editorials published in JAMA regarding vitamin C. While our critique largely focuses on this journal, it reflects a broader trend across medical literature, indicating a possible bias against acknowledging the benefits of vitamin C in fighting colds.
However, despite this evidence, mainstream medicine has often favored what we call eminence-based medicine, relying on influential figures rather than empirical data. The skepticism surrounding vitamin C largely traces back to three pivotal studies published in 1975, two in JAMA and one in the American Journal of Medicine. These studies have shaped the narrative in textbooks and nutritional guidelines, despite exhibiting notable flaws that we carefully examined.
Furthermore, we highlighted misleading reporting in recent randomized trials and critical editorials published in JAMA regarding vitamin C. While our critique largely focuses on this journal, it reflects a broader trend across medical literature, indicating a possible bias against acknowledging the benefits of vitamin C in fighting colds.
Read More
7
Vitamin C aids cold symptom relief
We explored the effectiveness of sodium ascorbate, or vitamin C, against colds and respiratory infections. While studies show that doses over 1 g/day do not prevent colds for most people, interestingly, those engaged in heavy physical activity experienced half the incidence of colds.
Additionally, regular intake of 1 g or more per day can lessen the severity of cold symptoms. Dosing up to 6-8 g/day after symptoms start has shown promise in reducing the duration of colds. Yet, results for preventing pneumonia in the general population remain unclear, though some benefits for certain patients were noted.
Overall, vitamin C might be worth considering for its potential to ease cold symptoms, keeping in mind its safety and affordability.
Additionally, regular intake of 1 g or more per day can lessen the severity of cold symptoms. Dosing up to 6-8 g/day after symptoms start has shown promise in reducing the duration of colds. Yet, results for preventing pneumonia in the general population remain unclear, though some benefits for certain patients were noted.
Overall, vitamin C might be worth considering for its potential to ease cold symptoms, keeping in mind its safety and affordability.
Read More
User Reviews
USERS' SCORE
Good
Based on 2 Reviews
8.6
- All Reviews
- Positive Reviews
- Negative Reviews
9
Effective treatment
6 people found this helpful
I bought this vitamin C at my nutritionist's suggestion. Upon sensing a common cold, I take half a teaspoon twice daily. Paired with vitamin D and zinc, I find it remarkably effective—I've avoided the hospital by following this regimen.
Read More
9
Quick recovery
2 people found this helpful
I consider this ascorbate essential in my medicine cabinet. My family takes it at the first sign of a common cold. I give my children a teaspoon's tip, and I take a teaspoon mixed in water if I get ill. It works wonders for recovery.
Read More
Frequently Asked Questions
9
Effective treatment
6 people found this helpful
I bought this vitamin C at my nutritionist's suggestion. Upon sensing a common cold, I take half a teaspoon twice daily. Paired with vitamin D and zinc, I find it remarkably effective—I've avoided the hospital by following this regimen.
7
Vitamin C aids cold symptom relief
We explored the effectiveness of sodium ascorbate, or vitamin C, against colds and respiratory infections. While studies show that doses over 1 g/day do not prevent colds for most people, interestingly, those engaged in heavy physical activity experienced half the incidence of colds.
Additionally, regular intake of 1 g or more per day can lessen the severity of cold symptoms. Dosing up to 6-8 g/day after symptoms start has shown promise in reducing the duration of colds. Yet, results for preventing pneumonia in the general population remain unclear, though some benefits for certain patients were noted.
Overall, vitamin C might be worth considering for its potential to ease cold symptoms, keeping in mind its safety and affordability.
Additionally, regular intake of 1 g or more per day can lessen the severity of cold symptoms. Dosing up to 6-8 g/day after symptoms start has shown promise in reducing the duration of colds. Yet, results for preventing pneumonia in the general population remain unclear, though some benefits for certain patients were noted.
Overall, vitamin C might be worth considering for its potential to ease cold symptoms, keeping in mind its safety and affordability.
7
Sodium ascorbate reduces cold severity
We analyzed results from randomized, double-blind trials to explore how sodium ascorbate, or vitamin C, affects common cold severity. Our findings revealed that vitamin C can reduce cold severity by about 15% compared to a placebo, particularly benefiting those with more severe symptoms. However, it did not significantly shorten the duration of mild cold symptoms.
This discovery highlights the importance of understanding how vitamin C can help manage the common cold, especially since severe symptoms can lead to absenteeism in work and school. More research is needed to further investigate these therapeutic effects.
This discovery highlights the importance of understanding how vitamin C can help manage the common cold, especially since severe symptoms can lead to absenteeism in work and school. More research is needed to further investigate these therapeutic effects.
8
We investigated whether taking additional Vitamin C can effectively help treat the common cold.
By examining 9 randomized placebo-controlled trials, we found that extra doses of Vitamin C may reduce the duration of a cold, shorten the time spent indoors, and alleviate symptoms like fever and chills.
Although those who regularly take Vitamin C can still benefit from increased doses at the onset of illness, it’s essential to remember that results can vary from person to person.
By examining 9 randomized placebo-controlled trials, we found that extra doses of Vitamin C may reduce the duration of a cold, shorten the time spent indoors, and alleviate symptoms like fever and chills.
Although those who regularly take Vitamin C can still benefit from increased doses at the onset of illness, it’s essential to remember that results can vary from person to person.
7
We conducted a randomized, double-blind, placebo-controlled trial involving 1,444 Korean Army soldiers to determine if vitamin C supplementation can prevent common colds. Participants were divided into two groups: one receiving 6000 mg of vitamin C daily and the other a placebo.
Our findings revealed that those taking vitamin C had a 20% lower risk of developing a cold. Notably, this benefit was more pronounced among certain subgroups, including never smokers and those in specific training camps.
The evidence suggests that vitamin C could play a role in reducing common colds, potentially informing military health policies for soldiers during training.
Our findings revealed that those taking vitamin C had a 20% lower risk of developing a cold. Notably, this benefit was more pronounced among certain subgroups, including never smokers and those in specific training camps.
The evidence suggests that vitamin C could play a role in reducing common colds, potentially informing military health policies for soldiers during training.
References
- Hemilä H, Chalker E. Vitamin C for the common cold and pneumonia. Pol Arch Intern Med. 2025;135. 10.20452/pamw.16926
- Hemilä H, Chalker E. Vitamin C reduces the severity of common colds: a meta-analysis. BMC Public Health. 2023;23:2468. 10.1186/s12889-023-17229-8
- Kim TK, Lim HR, Byun JS. Vitamin C supplementation reduces the odds of developing a common cold in Republic of Korea Army recruits: randomised controlled trial. BMJ Mil Health. 2022;168:117. 10.1136/bmjmilitary-2019-001384
- Ran L, Zhao W, Wang J, Wang H, Zhao Y, et al. Extra Dose of Vitamin C Based on a Daily Supplementation Shortens the Common Cold: A Meta-Analysis of 9 Randomized Controlled Trials. Biomed Res Int. 2018;2018:1837634. 10.1155/2018/1837634
- Hemilä H, Chalker E. Vitamin C for preventing and treating the common cold. Cochrane Database Syst Rev. 2013;2013:CD000980. 10.1002/14651858.CD000980.pub4
- Douglas RM, Hemilä H, Chalker E, Treacy B. Vitamin C for preventing and treating the common cold. Cochrane Database Syst Rev. 2007. PubMed
- Wintergerst ES, Maggini S, Hornig DH. Immune-enhancing role of vitamin C and zinc and effect on clinical conditions. Ann Nutr Metab. 2006;50:85. PubMed
- Sasazuki S, Sasaki S, Tsubono Y, Okubo S, Hayashi M, et al. Effect of vitamin C on common cold: randomized controlled trial. Eur J Clin Nutr. 2006;60:9. PubMed
- Douglas RM, Hemila H, D'Souza R, Chalker EB, Treacy B. Vitamin C for preventing and treating the common cold. Cochrane Database Syst Rev. 2004. PubMed
- Hemilä H, Chalker E. Bias against Vitamin C in Mainstream Medicine: Examples from Trials of Vitamin C for Infections. Life (Basel). 2022;12. 10.3390/life12010062
- Murni IK, Prawirohartono EP, Triasih R. Potential Role of Vitamins and Zinc on Acute Respiratory Infections Including Covid-19. Glob Pediatr Health. 2021;8:2333794X211021739. 10.1177/2333794X211021739
- Ran L, Zhao W, Wang H, Zhao Y, Bu H. Vitamin C as a Supplementary Therapy in Relieving Symptoms of the Common Cold: A Meta-Analysis of 10 Randomized Controlled Trials. Biomed Res Int. 2020;2020:8573742. 10.1155/2020/8573742
- Schloss J, Lauche R, Harnett J, Hannan N, Brown D, et al. Efficacy and safety of vitamin C in the management of acute respiratory infection and disease: A rapid review. Adv Integr Med. 2020;7:187. 10.1016/j.aimed.2020.07.008
Data last updated:
