*Food BlendOrganic brown rice, organic orange, organic amla fruit, organic rose hip fruit, organic cranberry, organic green bell pepper, organic wild blueberry
536 mg
**
Top Medical Research Studies
8
Vitamin C reduces cold severity
Vitamin C reduces the severity of common colds: a meta-analysis.
We explored how vitamin C affects the severity of common colds through a comprehensive review of available studies. By including only randomized, placebo-controlled trials where participants received at least 1 gram of vitamin C daily, we aimed to investigate both the overall duration of colds and the intensity of symptoms experienced.
Our analysis found that vitamin C significantly reduced the severity of cold symptoms by about 15%. Interestingly, it appears that the benefits are more pronounced for those experiencing severe symptoms compared to mild ones. In specific comparisons, vitamin C didn’t substantially affect the duration of mild symptoms but had a notable impact on how long severe symptoms lasted.
This insight is crucial, as the common cold often leads to absenteeism at work and school, with more severe symptoms playing a key role in this setback. By highlighting vitamin C's greater effectiveness against intense cold symptoms, we suggest that future research should continue to look into how this vitamin can be utilized in managing cold severity.
Read More
8
Vitamin C's potential benefits highlighted
Bias against Vitamin C in Mainstream Medicine: Examples from Trials of Vitamin C for Infections.
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.
Read More
8
Vitamin C reduces cold incidence
Vitamin C supplementation reduces the odds of developing a common cold in Republic of Korea Army recruits: randomised controlled trial.
We conducted an insightful study to explore whether vitamin C supplementation can help reduce the incidence of common colds among Republic of Korea Army recruits. Our research involved a rigorous randomised, placebo-controlled trial that included 1,444 soldiers over a 30-day period.
In this study, we divided the participants into two groups: one received a daily dose of 6,000 mg of vitamin C while the other received a placebo with no vitamin C. We investigated the soldiers' medical records to see how many of them contracted a cold during the training period.
Our findings showed encouraging results. The group that took vitamin C had a 20% lower risk of developing a common cold compared to those who took the placebo. Interestingly, this protective effect was especially pronounced among recruits in certain training camps, as well as never smokers and those who were physically ranked at level three.
Overall, we observed that vitamin C supplementation appears to be an effective strategy for reducing the incidence of common colds in military settings, which may lead to considerations for implementing vitamin C provisions during basic training for soldiers.
Read More
Most Useful Reviews
9
Boosts immunity efficiently
16 people found this helpful
This product is truly luxurious and differs from others that only contain ascorbic acid. It is extracted from whole fruits, maximising vitamin C's benefits. Crucially, it strengthens immunity against respiratory diseases and colds. I take it with iron to aid absorption, and I've seen improvements in my health, like reduced hair fall and healthier nails. Truly a fantastic product!
Read More
9
Excellent immune booster
5 people found this helpful
This Vitamin C Complex recommended by Dr. Karim Ali has notably boosted my immune system. The product is characterised by its high quality and supports against colds and infections. The dosage is perfect, and it does not cause any stomach discomfort. Overall, it has positively impacted my health and well-being.
Read More
9
Goodbye to colds
3 people found this helpful
This product is essential for me; my immunity has notably improved. Since using it, I have said goodbye to colds and seasonal allergies. The quantity is generous and lasts a long time, making it a staple in my routine.
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.
Read More
8
Vitamin C reduces cold severity
Vitamin C reduces the severity of common colds: a meta-analysis.
We explored how vitamin C affects the severity of common colds through a comprehensive review of available studies. By including only randomized, placebo-controlled trials where participants received at least 1 gram of vitamin C daily, we aimed to investigate both the overall duration of colds and the intensity of symptoms experienced.
Our analysis found that vitamin C significantly reduced the severity of cold symptoms by about 15%. Interestingly, it appears that the benefits are more pronounced for those experiencing severe symptoms compared to mild ones. In specific comparisons, vitamin C didn’t substantially affect the duration of mild symptoms but had a notable impact on how long severe symptoms lasted.
This insight is crucial, as the common cold often leads to absenteeism at work and school, with more severe symptoms playing a key role in this setback. By highlighting vitamin C's greater effectiveness against intense cold symptoms, we suggest that future research should continue to look into how this vitamin can be utilized in managing cold severity.
Read More
8
Vitamin C's potential benefits highlighted
Bias against Vitamin C in Mainstream Medicine: Examples from Trials of Vitamin C for Infections.
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.
Read More
8
Vitamin C reduces cold incidence
Vitamin C supplementation reduces the odds of developing a common cold in Republic of Korea Army recruits: randomised controlled trial.
We conducted an insightful study to explore whether vitamin C supplementation can help reduce the incidence of common colds among Republic of Korea Army recruits. Our research involved a rigorous randomised, placebo-controlled trial that included 1,444 soldiers over a 30-day period.
In this study, we divided the participants into two groups: one received a daily dose of 6,000 mg of vitamin C while the other received a placebo with no vitamin C. We investigated the soldiers' medical records to see how many of them contracted a cold during the training period.
Our findings showed encouraging results. The group that took vitamin C had a 20% lower risk of developing a common cold compared to those who took the placebo. Interestingly, this protective effect was especially pronounced among recruits in certain training camps, as well as never smokers and those who were physically ranked at level three.
Overall, we observed that vitamin C supplementation appears to be an effective strategy for reducing the incidence of common colds in military settings, which may lead to considerations for implementing vitamin C provisions during basic training for soldiers.
We investigated how vitamin C affects the common cold, focusing on its potential for prevention and treatment. Research indicates that while vitamin C does not prevent colds in the general population when taken at doses over 1 g/day, it has been beneficial for individuals engaging in heavy physical activity, effectively halving their incidence of colds.
Looking into regular supplementation, we found that taking 1 g or more daily can reduce the severity of colds by about 15%. However, when it comes to starting vitamin C after cold symptoms begin, results are less consistent, though higher doses of 6-8 g/day did significantly shorten the duration of colds compared to lower doses.
Interestingly, historical studies showed that vitamin C might prevent pneumonia in specific populations, such as schoolboys or soldiers, but this doesn’t translate to the general public. While some trials indicated potential benefits for pneumonia patients, the evidence is not conclusive.
Overall, we see that given the evidence supporting reduced severity and duration of colds, along with its safety and affordability, it may be worth considering a higher dose of vitamin C for those looking to manage cold symptoms better.
This product is truly luxurious and differs from others that only contain ascorbic acid. It is extracted from whole fruits, maximising vitamin C's benefits. Crucially, it strengthens immunity against respiratory diseases and colds. I take it with iron to aid absorption, and I've seen improvements in my health, like reduced hair fall and healthier nails. Truly a fantastic product!
Read More
9
Excellent immune booster
5 people found this helpful
This Vitamin C Complex recommended by Dr. Karim Ali has notably boosted my immune system. The product is characterised by its high quality and supports against colds and infections. The dosage is perfect, and it does not cause any stomach discomfort. Overall, it has positively impacted my health and well-being.
Read More
9
Goodbye to colds
3 people found this helpful
This product is essential for me; my immunity has notably improved. Since using it, I have said goodbye to colds and seasonal allergies. The quantity is generous and lasts a long time, making it a staple in my routine.
Read More
9
Symptom relief
2 people found this helpful
This is a wonderful product I adore. If I feel cold symptoms, I take two pills in the morning and two in the evening. It has helped me immensely, with no symptoms besides increased burning sensation. Truly a great product.
Read More
9
Quick recovery
1 people found this helpful
I felt the initial symptoms of a cold, took a loading dose, and everything resolved quickly.
The common cold is a viral infection of the upper respiratory tract, primarily affecting the nose and throat. It's caused by a variety of viruses, with rhinoviruses being the most prevalent. Symptoms generally include a runny or stuffy nose, sore throat, cough, sneezing, mild headache, and sometimes a low-grade fever. While the common cold is often mild and resolves on its own within a week or two, it can still be bothersome and impact daily activities.
Transmission occurs through respiratory droplets when an infected person coughs or sneezes, or by touching surfaces contaminated with the virus. Preventative measures include frequent handwashing, using hand sanitizer, and avoiding close contact with infected individuals. Since there is currently no cure for the common cold, treatment focuses on symptom relief through over-the-counter medications, adequate rest, and hydration. While colds may be uncomfortable, they are generally not serious; however, seeking medical attention may be necessary if symptoms worsen or persist for an extended period.
Vitamin C, also known as ascorbic acid, is a water-soluble vitamin that plays a critical role in numerous bodily functions. As an essential nutrient, it contributes to the growth and repair of tissues in the body, and it is vital for the production of collagen, an important protein that helps maintain skin, cartilage, tendons, ligaments, and blood vessels. Additionally, Vitamin C acts as a powerful antioxidant, which means it helps combat free radicals—unstable molecules that can cause oxidative stress and contribute to various chronic diseases.
Moreover, Vitamin C enhances iron absorption from plant-based foods, making it a vital component for those following vegetarian or vegan diets. While many people get sufficient Vitamin C from a well-balanced diet that includes fruits and vegetables like oranges, strawberries, kiwi, broccoli, and bell peppers, some individuals might require supplementation. It's generally recommended to stay within the daily intake guidelines, as excessive consumption can lead to gastrointestinal disturbances. Overall, Vitamin C is not just a skincare celebrity—it's a fundamental part of maintaining overall health and well-being.
Vitamin C has long been touted as a remedy for the common cold, but the evidence supporting its efficacy is mixed. Some studies suggest that regular consumption of Vitamin C may reduce the duration and severity of cold symptoms, particularly in individuals who engage in intense physical activity or have a deficiency in this vitamin. However, for the average person, taking Vitamin C after the onset of cold symptoms is generally not shown to have a significant impact on shortening the cold.
If you're considering using Vitamin C to fend off colds, incorporating it into your daily routine through fruits and vegetables, such as oranges, strawberries, and bell peppers, can support overall immune function. Supplements might be beneficial for those who struggle to get enough from their diet, but they are not a guaranteed cure. While Vitamin C isn't a magic bullet against the common cold, maintaining adequate levels can contribute to overall health and may help mitigate some symptoms. However, always consult with a healthcare provider before starting any new supplement regimens.
Based on user reviews, many consumers report experiencing results soon after starting the supplement, particularly when addressing symptoms of the common cold. Several users have noted that they felt improvements rapidly, with some stating that they noticed relief on the same day they took the vitamin C complex Read Review. Others highlighted the effectiveness of using a loading dose at the onset of symptoms to resolve their issues quickly Read Review.
Additionally, users have mentioned that regular use of the vitamin C complex has enhanced their overall immunity and better helped them fend off colds, suggesting that consistent intake can be beneficial for long-term health as well Read Review. Generally, it appears that many users see positive results within days to weeks, particularly when they increase their dosage during cold symptoms.
Numerous studies have investigated the role of vitamin C in managing common cold symptoms, revealing promising results. Research indicates that while vitamin C does not prevent colds in the general population, it can reduce the severity of cold symptoms by about 15% for individuals taking doses of at least 1 g per day [1]. Specifically, those engaging in intense physical activity may benefit even more, with a noted reduction in their incidence of colds [1]. Additionally, when taken at higher doses (6-8 g/day) after the onset of symptoms, vitamin C has been shown to significantly shorten the duration of colds [1].
Further evidence suggests that vitamin C supplementation can enhance recovery when combined with antiviral treatments, demonstrating improved efficacy in alleviating cold symptoms [5]. While mainstream skepticism still exists regarding its benefits, the cumulative evidence points to vitamin C as a potentially helpful supplement for managing the severity and duration of common cold symptoms, especially for those under specific environmental stressors or engaging in physical exertion. Overall, incorporating vitamin C could be a valuable strategy for individuals looking to mitigate the discomfort associated with colds.
Based on user reviews, many individuals report notable improvements in their immunity and relief from cold symptoms after using this vitamin C complex. Users claim enhanced resilience against respiratory illnesses, with some specifically mentioning they have successfully avoided colds and seasonal allergies since incorporating the product into their routine Read Review. Additionally, when users feel the onset of cold symptoms, they often resort to a loading dose, experiencing rapid relief, sometimes on the same day (review id='e08277d6-dca8-4118-b631-5119252e9754', review id='8a605b7b-8c1a-4f06-9ddc-6ec0efff4265').
Moreover, the overall trend among users indicates that regular intake not only bolsters immunity but also results in improved well-being, contributing to healthier skin and reducing issues like hair fall Read Review. Several reviewers have shared that the product is gentle on the stomach and does not cause discomfort, making it suitable for ongoing use (review id='04865c8f-0328-48d5-832c-6a867379d41d', review id='f6027596-d719-4fd1-9b4d-c8342ce3b08e'). While the experiences are largely positive, it's essential to note that individual results can vary.
Based on user reviews, many individuals combining this vitamin C complex with other supplements, such as iron, collagen, and B-complex vitamins, report enhanced effects in managing common cold symptoms and overall immunity. For instance, one user noted that taking the supplement with iron aided absorption and improved their health, including reduced hair fall and enhanced nail health Read Review. Another reviewer mentioned that they consume it with collagen, particularly increasing their dosage during cold symptoms, attributing significant benefits to both their immunity and skin Read Review.
Users also appreciate the flexibility to adjust dosages depending on their condition. Some have indicated that they take larger doses when they first feel signs of a cold, experiencing rapid improvements, and are able to do so comfortably alongside other vitamins (review id='21bfd4e0-f8cc-4055-9868-16171be14b45', review id='8a605b7b-8c1a-4f06-9ddc-6ec0efff4265'). Overall, the combination of this vitamin C complex with other dietary supplements appears to support users in managing colds more effectively while boosting their immune function Read Review.
The optimal dose of Vitamin C for treating the common cold appears to be around 6-8 grams per day, particularly when taken at the onset of symptoms. Research indicates that while regular supplementation of at least 1 gram daily can reduce the severity of colds by about 15%, higher doses are linked to a significant reduction in the duration of cold symptoms, especially for those experiencing intense symptoms [1]. In one notable study involving South Korean soldiers, a daily dose of 6,000 mg of Vitamin C resulted in a 20% lower incidence of colds, suggesting that higher doses may be particularly beneficial for individuals under stress or in physically demanding situations [7].
Additionally, a comprehensive review indicates that while Vitamin C may not prevent colds in the general population, it can effectively shorten their duration and lessen the severity of symptoms when taken proactively [2]. Overall, considering the evidence supporting both the safety and affordability of Vitamin C, individuals could see positive results in managing cold symptoms by opting for higher doses, provided they do not exceed recommended limits set for general usage.[3]
7.5
Relieves cold symptoms
5 people found this helpful
When I took this vitamin C, it relieved my cold symptoms, including a strong headache, on the same day. Although I found the tablet size a bit large, the results were impressive. I had some digestive upset, which may not directly relate to the supplement, but I'll assess it further. Overall, the vitamin has been beneficial.
9
Quick recovery
1 people found this helpful
I felt the initial symptoms of a cold, took a loading dose, and everything resolved quickly.
9
Better immunity observed
1 people found this helpful
I am happy to feel the difference after continuously ordering this vitamin C. When taken regularly, I noticed improved immunity and found it easier to avoid flu or common colds, even with sick individuals around me. It's also much easier to swallow than other vitamin C supplements I've used. I trust the quality of this product.
9
Goodbye to colds
3 people found this helpful
This product is essential for me; my immunity has notably improved. Since using it, I have said goodbye to colds and seasonal allergies. The quantity is generous and lasts a long time, making it a staple in my routine.
9
Boosts immunity efficiently
16 people found this helpful
This product is truly luxurious and differs from others that only contain ascorbic acid. It is extracted from whole fruits, maximising vitamin C's benefits. Crucially, it strengthens immunity against respiratory diseases and colds. I take it with iron to aid absorption, and I've seen improvements in my health, like reduced hair fall and healthier nails. Truly a fantastic product!
6
Natural vitamin source
20 people found this helpful
This natural vitamin C complex, used alongside collagen, has greatly improved my skin. I take one post-meal, increasing to two when catching a cold to boost immunity, as smokers particularly need this vitamin due to its deficiency. There are no complications; excessive amounts are simply flushed out. I highly recommend it for its natural formulation.
7.5
Strengthens immunity
51 people found this helpful
One of the best vitamin C supplements I've tried. It does not irritate mucous membranes and has a moderately sour taste. Made from raw vegetables and fruits, it's organic. While not as potent as sodium or calcium ascorbate forms, MegaFood's C complex benefits our health. I consume it with collagen on an empty stomach or increase the dosage during viral infections and colds. Highly recommend!
We investigated how vitamin C affects the common cold, focusing on its potential for prevention and treatment. Research indicates that while vitamin C does not prevent colds in the general population when taken at doses over 1 g/day, it has been beneficial for individuals engaging in heavy physical activity, effectively halving their incidence of colds.
Looking into regular supplementation, we found that taking 1 g or more daily can reduce the severity of colds by about 15%. However, when it comes to starting vitamin C after cold symptoms begin, results are less consistent, though higher doses of 6-8 g/day did significantly shorten the duration of colds compared to lower doses.
Interestingly, historical studies showed that vitamin C might prevent pneumonia in specific populations, such as schoolboys or soldiers, but this doesn’t translate to the general public. While some trials indicated potential benefits for pneumonia patients, the evidence is not conclusive.
Overall, we see that given the evidence supporting reduced severity and duration of colds, along with its safety and affordability, it may be worth considering a higher dose of vitamin C for those looking to manage cold symptoms better.
9
Vitamin C aids common cold recovery
Vitamin C as a Supplementary Therapy in Relieving Symptoms of the Common Cold: A Meta-Analysis of 10 Randomized Controlled Trials.
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.
8
Vitamin C reduces cold incidence
Vitamin C supplementation reduces the odds of developing a common cold in Republic of Korea Army recruits: randomised controlled trial.
We conducted an insightful study to explore whether vitamin C supplementation can help reduce the incidence of common colds among Republic of Korea Army recruits. Our research involved a rigorous randomised, placebo-controlled trial that included 1,444 soldiers over a 30-day period.
In this study, we divided the participants into two groups: one received a daily dose of 6,000 mg of vitamin C while the other received a placebo with no vitamin C. We investigated the soldiers' medical records to see how many of them contracted a cold during the training period.
Our findings showed encouraging results. The group that took vitamin C had a 20% lower risk of developing a common cold compared to those who took the placebo. Interestingly, this protective effect was especially pronounced among recruits in certain training camps, as well as never smokers and those who were physically ranked at level three.
Overall, we observed that vitamin C supplementation appears to be an effective strategy for reducing the incidence of common colds in military settings, which may lead to considerations for implementing vitamin C provisions during basic training for soldiers.
8
Vitamin C reduces cold severity
Vitamin C reduces the severity of common colds: a meta-analysis.
We explored how vitamin C affects the severity of common colds through a comprehensive review of available studies. By including only randomized, placebo-controlled trials where participants received at least 1 gram of vitamin C daily, we aimed to investigate both the overall duration of colds and the intensity of symptoms experienced.
Our analysis found that vitamin C significantly reduced the severity of cold symptoms by about 15%. Interestingly, it appears that the benefits are more pronounced for those experiencing severe symptoms compared to mild ones. In specific comparisons, vitamin C didn’t substantially affect the duration of mild symptoms but had a notable impact on how long severe symptoms lasted.
This insight is crucial, as the common cold often leads to absenteeism at work and school, with more severe symptoms playing a key role in this setback. By highlighting vitamin C's greater effectiveness against intense cold symptoms, we suggest that future research should continue to look into how this vitamin can be utilized in managing cold severity.
8
Vitamin C's potential benefits highlighted
Bias against Vitamin C in Mainstream Medicine: Examples from Trials of Vitamin C for Infections.
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.
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
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
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