' 
SCIENTIFIC SCORE
Possibly Effective
Based on 8 Researches
7.3
USERS' SCORE
Good
Based on 43 Reviews
8.9
Supplement Facts
Serving Size: 1 Softgel
Amount Per Serving
%DV
Vitamin D3 (as Cholecalciferol) (From Lanolin)
1,250 mcg (50,000 IU)
6250%
Top Medical Research Studies
8
Vitamin D reduces cold severity
Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respiratory Infection during Military Training.
Strong relevance to cold health.
We explored the connection between vitamin D levels and upper respiratory tract infections (URTIs) among military recruits during their training. This observation spanned across different seasons and included over 1,600 recruits. Our aim was to understand how achieving sufficient vitamin D levels could potentially impact the frequency and severity of colds among physically active individuals.
In an additional phase of the research, we conducted a randomized controlled trial with 250 male recruits. They received either a placebo, simulated sunlight exposure, or oral vitamin D3 supplements during winter. This comparison allowed us to see if these methods effectively increased vitamin D levels to a sufficient status of 25(OH)D at 50 nmol/L or higher.
Notably, our findings showed that only 21% of recruits had adequate vitamin D during winter, yet those who did were 40% less likely to suffer from URTIs. Furthermore, both vitamin D supplementation strategies similarly helped nearly all participants achieve sufficient levels. Vitamin D supplementation notably reduced the severity of URTI symptoms by 15% and the number of days with URTIs by 36% compared to placebo.
While the supplementation strategies did not significantly alter other immune factors, such as salivary secretory immunoglobulin A, the overall reduction in respiratory infections indicates a beneficial effect of maintaining vitamin D sufficiency during military training.
In an additional phase of the research, we conducted a randomized controlled trial with 250 male recruits. They received either a placebo, simulated sunlight exposure, or oral vitamin D3 supplements during winter. This comparison allowed us to see if these methods effectively increased vitamin D levels to a sufficient status of 25(OH)D at 50 nmol/L or higher.
Notably, our findings showed that only 21% of recruits had adequate vitamin D during winter, yet those who did were 40% less likely to suffer from URTIs. Furthermore, both vitamin D supplementation strategies similarly helped nearly all participants achieve sufficient levels. Vitamin D supplementation notably reduced the severity of URTI symptoms by 15% and the number of days with URTIs by 36% compared to placebo.
While the supplementation strategies did not significantly alter other immune factors, such as salivary secretory immunoglobulin A, the overall reduction in respiratory infections indicates a beneficial effect of maintaining vitamin D sufficiency during military training.
Read More
8
Vitamin D3 aids cold recovery
Intake of 25-Hydroxyvitamin D3 Reduces Duration and Severity of Upper Respiratory Tract Infection: A Randomized, Double-Blind, Placebo-Controlled, Parallel Group Comparison Study.
High relevance to vitamin D research
We explored how 25-hydroxyvitamin D3 (25OHD), a form of vitamin D, influences upper respiratory tract infections (URTIs), commonly known as colds. In a carefully designed clinical study, we followed 428 participants aged 45 to 74 over a 16-week period. They were randomly assigned to receive either 10 μg of 25OHD daily or a placebo, all while maintaining a double-blind setup to ensure accurate results.
Our findings revealed that those who took 25OHD had reduced duration and severity of their cold symptoms. Participants reported improvements in their overall quality of life during the bouts of URTI. By tracking the health of the participants through surveys designed to measure cold symptoms, we gathered valuable data that indicates vitamin D3 could play a helpful role in managing colds.
This suggests that incorporating vitamin D3 into our diets may be beneficial when we catch a cold, potentially leading to a quicker recovery. It’s a promising avenue for anyone looking to ease the discomfort and duration of these frustrating infections.
Our findings revealed that those who took 25OHD had reduced duration and severity of their cold symptoms. Participants reported improvements in their overall quality of life during the bouts of URTI. By tracking the health of the participants through surveys designed to measure cold symptoms, we gathered valuable data that indicates vitamin D3 could play a helpful role in managing colds.
This suggests that incorporating vitamin D3 into our diets may be beneficial when we catch a cold, potentially leading to a quicker recovery. It’s a promising avenue for anyone looking to ease the discomfort and duration of these frustrating infections.
Read More
8
Vitamin D enhances cold resilience
Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respiratory Infection during Military Training.
Study focused on vitamin D3
We delved into the effects of vitamin D on cold symptoms among military recruits during their training. In two comprehensive studies, we observed over 1,600 military recruits to see how their vitamin D levels impacted their likelihood of upper respiratory tract infections (URTIs) throughout the seasons.
In the first study, only 21% of recruits were found to have sufficient vitamin D levels during winter. Notably, those with adequate vitamin D were 40% less likely to experience URTIs compared to those who were deficient. Each URTI typically caused three missed training days, indicating a significant impact on their training schedules.
Following this, we conducted a randomized controlled trial with 250 men simulating sunlight exposure or providing oral vitamin D3 supplementation. Our goal was to see how both methods affected overall vitamin D levels and, subsequently, URTI symptoms. Remarkably, both strategies successfully brought participants to sufficient vitamin D levels. Compared to those who received a placebo, those getting vitamin D3 experienced a 15% reduction in the severity of cold symptoms and a 36% decrease in the number of days with URTI.
Interestingly, we found that both methods—simulated sunlight and oral supplementation—were equally effective, and neither had a significant impact on specific immune response markers.
In the first study, only 21% of recruits were found to have sufficient vitamin D levels during winter. Notably, those with adequate vitamin D were 40% less likely to experience URTIs compared to those who were deficient. Each URTI typically caused three missed training days, indicating a significant impact on their training schedules.
Following this, we conducted a randomized controlled trial with 250 men simulating sunlight exposure or providing oral vitamin D3 supplementation. Our goal was to see how both methods affected overall vitamin D levels and, subsequently, URTI symptoms. Remarkably, both strategies successfully brought participants to sufficient vitamin D levels. Compared to those who received a placebo, those getting vitamin D3 experienced a 15% reduction in the severity of cold symptoms and a 36% decrease in the number of days with URTI.
Interestingly, we found that both methods—simulated sunlight and oral supplementation—were equally effective, and neither had a significant impact on specific immune response markers.
Read More
Most Useful Reviews
8.8
Cold prevention
For temporary cold prevention, I take a single dose with vitamin K2 when someone near me has a cold. It appears to be effective. I ensure a week's gap between doses due to potential overdose risks, as noted on the manufacturer's site.
Read More
9.5
Boosts immunity
I’ve been taking vitamin D3 for several months and the results have been remarkable. It has become essential to my daily routine, elevating my energy and mood significantly. My bones feel stronger and my joints are more mobile. During periods of virus activity, I feel more shielded, avoiding colds. This easy-to-take capsule provides a dose of sunshine that enhances my health daily.
Read More
9.5
Stops cold onset
I mistakenly bought the wrong size, but when my family started feeling unwell, I took it. Thanks to this, I can prevent colds at their onset, making me very content.
Read More
Medical Researches
SCIENTIFIC SCORE
Possibly Effective
Based on 8 Researches
7.3
- All Researches
8
Vitamin D reduces cold severity
Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respiratory Infection during Military Training.
Strong relevance to cold health.
We explored the connection between vitamin D levels and upper respiratory tract infections (URTIs) among military recruits during their training. This observation spanned across different seasons and included over 1,600 recruits. Our aim was to understand how achieving sufficient vitamin D levels could potentially impact the frequency and severity of colds among physically active individuals.
In an additional phase of the research, we conducted a randomized controlled trial with 250 male recruits. They received either a placebo, simulated sunlight exposure, or oral vitamin D3 supplements during winter. This comparison allowed us to see if these methods effectively increased vitamin D levels to a sufficient status of 25(OH)D at 50 nmol/L or higher.
Notably, our findings showed that only 21% of recruits had adequate vitamin D during winter, yet those who did were 40% less likely to suffer from URTIs. Furthermore, both vitamin D supplementation strategies similarly helped nearly all participants achieve sufficient levels. Vitamin D supplementation notably reduced the severity of URTI symptoms by 15% and the number of days with URTIs by 36% compared to placebo.
While the supplementation strategies did not significantly alter other immune factors, such as salivary secretory immunoglobulin A, the overall reduction in respiratory infections indicates a beneficial effect of maintaining vitamin D sufficiency during military training.
In an additional phase of the research, we conducted a randomized controlled trial with 250 male recruits. They received either a placebo, simulated sunlight exposure, or oral vitamin D3 supplements during winter. This comparison allowed us to see if these methods effectively increased vitamin D levels to a sufficient status of 25(OH)D at 50 nmol/L or higher.
Notably, our findings showed that only 21% of recruits had adequate vitamin D during winter, yet those who did were 40% less likely to suffer from URTIs. Furthermore, both vitamin D supplementation strategies similarly helped nearly all participants achieve sufficient levels. Vitamin D supplementation notably reduced the severity of URTI symptoms by 15% and the number of days with URTIs by 36% compared to placebo.
While the supplementation strategies did not significantly alter other immune factors, such as salivary secretory immunoglobulin A, the overall reduction in respiratory infections indicates a beneficial effect of maintaining vitamin D sufficiency during military training.
Read More
8
Vitamin D enhances cold resilience
Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respiratory Infection during Military Training.
Study focused on vitamin D3
We delved into the effects of vitamin D on cold symptoms among military recruits during their training. In two comprehensive studies, we observed over 1,600 military recruits to see how their vitamin D levels impacted their likelihood of upper respiratory tract infections (URTIs) throughout the seasons.
In the first study, only 21% of recruits were found to have sufficient vitamin D levels during winter. Notably, those with adequate vitamin D were 40% less likely to experience URTIs compared to those who were deficient. Each URTI typically caused three missed training days, indicating a significant impact on their training schedules.
Following this, we conducted a randomized controlled trial with 250 men simulating sunlight exposure or providing oral vitamin D3 supplementation. Our goal was to see how both methods affected overall vitamin D levels and, subsequently, URTI symptoms. Remarkably, both strategies successfully brought participants to sufficient vitamin D levels. Compared to those who received a placebo, those getting vitamin D3 experienced a 15% reduction in the severity of cold symptoms and a 36% decrease in the number of days with URTI.
Interestingly, we found that both methods—simulated sunlight and oral supplementation—were equally effective, and neither had a significant impact on specific immune response markers.
In the first study, only 21% of recruits were found to have sufficient vitamin D levels during winter. Notably, those with adequate vitamin D were 40% less likely to experience URTIs compared to those who were deficient. Each URTI typically caused three missed training days, indicating a significant impact on their training schedules.
Following this, we conducted a randomized controlled trial with 250 men simulating sunlight exposure or providing oral vitamin D3 supplementation. Our goal was to see how both methods affected overall vitamin D levels and, subsequently, URTI symptoms. Remarkably, both strategies successfully brought participants to sufficient vitamin D levels. Compared to those who received a placebo, those getting vitamin D3 experienced a 15% reduction in the severity of cold symptoms and a 36% decrease in the number of days with URTI.
Interestingly, we found that both methods—simulated sunlight and oral supplementation—were equally effective, and neither had a significant impact on specific immune response markers.
Read More
8
Vitamin D3 aids cold symptom relief
Intake of 25-Hydroxyvitamin D May Reduce the Severity of Upper Respiratory Tract Infection: Post hoc Analysis of a Randomized, Double-Blind, Placebo-Controlled, Parallel Group Comparison Study.
Directly addresses vitamin D3 effects
We explored the potential benefits of vitamin D3, specifically 25-hydroxyvitamin D, on cold symptoms among people with insufficient or deficient levels of this essential nutrient. The study was well-designed, involving a randomized, double-blind, placebo-controlled method where participants received either 10 μg of vitamin D3 or a placebo over 16 weeks.
During the study, we used a tool called the Wisconsin Upper Respiratory Symptom Survey-21, which helped us collect data on physical signs and symptoms of upper respiratory tract infections (URTI). We observed that participants who took vitamin D3 experienced significantly lower scores for symptoms like runny nose, sneezing, and head congestion compared to those on a placebo. Additionally, their overall quality of life, except for the ability to breathe easily, improved when they were taking vitamin D3.
However, it's important to note that the number of cold occurrences and the use of other medications, like antibiotics and pain relievers, showed no significant difference between the two groups. Overall, our findings suggest that adequate intake of vitamin D3 can indeed help reduce certain cold symptoms and enhance quality of life when a cold strikes.
During the study, we used a tool called the Wisconsin Upper Respiratory Symptom Survey-21, which helped us collect data on physical signs and symptoms of upper respiratory tract infections (URTI). We observed that participants who took vitamin D3 experienced significantly lower scores for symptoms like runny nose, sneezing, and head congestion compared to those on a placebo. Additionally, their overall quality of life, except for the ability to breathe easily, improved when they were taking vitamin D3.
However, it's important to note that the number of cold occurrences and the use of other medications, like antibiotics and pain relievers, showed no significant difference between the two groups. Overall, our findings suggest that adequate intake of vitamin D3 can indeed help reduce certain cold symptoms and enhance quality of life when a cold strikes.
Read More
8
Vitamin D3 aids cold recovery
Intake of 25-Hydroxyvitamin D3 Reduces Duration and Severity of Upper Respiratory Tract Infection: A Randomized, Double-Blind, Placebo-Controlled, Parallel Group Comparison Study.
High relevance to vitamin D research
We explored how 25-hydroxyvitamin D3 (25OHD), a form of vitamin D, influences upper respiratory tract infections (URTIs), commonly known as colds. In a carefully designed clinical study, we followed 428 participants aged 45 to 74 over a 16-week period. They were randomly assigned to receive either 10 μg of 25OHD daily or a placebo, all while maintaining a double-blind setup to ensure accurate results.
Our findings revealed that those who took 25OHD had reduced duration and severity of their cold symptoms. Participants reported improvements in their overall quality of life during the bouts of URTI. By tracking the health of the participants through surveys designed to measure cold symptoms, we gathered valuable data that indicates vitamin D3 could play a helpful role in managing colds.
This suggests that incorporating vitamin D3 into our diets may be beneficial when we catch a cold, potentially leading to a quicker recovery. It’s a promising avenue for anyone looking to ease the discomfort and duration of these frustrating infections.
Our findings revealed that those who took 25OHD had reduced duration and severity of their cold symptoms. Participants reported improvements in their overall quality of life during the bouts of URTI. By tracking the health of the participants through surveys designed to measure cold symptoms, we gathered valuable data that indicates vitamin D3 could play a helpful role in managing colds.
This suggests that incorporating vitamin D3 into our diets may be beneficial when we catch a cold, potentially leading to a quicker recovery. It’s a promising avenue for anyone looking to ease the discomfort and duration of these frustrating infections.
Read More
7
Vitamin D's limited cold impact
High-dose oral vitamin D supplementation for prevention of infections in children aged 0 to 59 months: a systematic review and meta-analysis.
Addresses vitamin D and colds
We evaluated the impact of high-dose vitamin D supplementation, specifically doses exceeding the standard 400 IU, on preventing colds and other infections in children under five years of age. Our analysis included seven studies, involving a total of 5,748 children, which looked into how effective vitamin D might be in reducing the incidence of upper respiratory tract infections.
Interestingly, while our findings showed no significant benefit of high-dose vitamin D on the prevention of upper respiratory tract infections as a whole, we did observe a noteworthy reduction in specific illness occurrences. We noted a 57% reduction in colds, a 56% reduction in coughs, and a 59% decrease in fever rates with daily doses exceeding 1,000 IU.
However, we must approach these findings with caution, as the evidence supporting the reduction in cough and fever was of lower certainty. No significant effects were observed regarding other conditions such as bronchitis or otitis media. Overall, while high-dose vitamin D may help with colds specifically, further research is needed to solidify these conclusions.
Interestingly, while our findings showed no significant benefit of high-dose vitamin D on the prevention of upper respiratory tract infections as a whole, we did observe a noteworthy reduction in specific illness occurrences. We noted a 57% reduction in colds, a 56% reduction in coughs, and a 59% decrease in fever rates with daily doses exceeding 1,000 IU.
However, we must approach these findings with caution, as the evidence supporting the reduction in cough and fever was of lower certainty. No significant effects were observed regarding other conditions such as bronchitis or otitis media. Overall, while high-dose vitamin D may help with colds specifically, further research is needed to solidify these conclusions.
Read More
User Reviews
USERS' SCORE
Good
Based on 43 Reviews
8.9
- All Reviews
- Positive Reviews
- Negative Reviews
8.8
Cold prevention
For temporary cold prevention, I take a single dose with vitamin K2 when someone near me has a cold. It appears to be effective. I ensure a week's gap between doses due to potential overdose risks, as noted on the manufacturer's site.
9.5
Boosts immunity
I’ve been taking vitamin D3 for several months and the results have been remarkable. It has become essential to my daily routine, elevating my energy and mood significantly. My bones feel stronger and my joints are more mobile. During periods of virus activity, I feel more shielded, avoiding colds. This easy-to-take capsule provides a dose of sunshine that enhances my health daily.
Read More
9.5
Stops cold onset
I mistakenly bought the wrong size, but when my family started feeling unwell, I took it. Thanks to this, I can prevent colds at their onset, making me very content.
9.5
Increased energy levels
Excellent! This high-potency vitamin D3 from NOW Foods has effectively corrected my vitamin D deficiency. I take one capsule weekly as my doctor advised. This dosage (50,000 IU) is ideal for restoring vitamin D levels after my test. After two months, my levels normalised, and I felt more energetic and resistant to colds. The soft capsules are easy to swallow, and the small pack of 50 suits a limited course of treatment.
Read More
9.5
Fights cold effectively
I take this more than once a week. NOW Foods Vitamin D-3 Max Potency is a game-changer for managing vitamin D deficiencies. Each softgel delivers a potent 50,000 IU, ideal for those on a high-potency regimen. They are small, easy to swallow, and leave no aftertaste, which is a major plus. After consistent use, I noticed significant improvements in my energy, mood, and symptoms like fatigue and muscle weakness, especially during colder months.
Read More
