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NOW Supplements Vitamin C-1
SCIENTIFIC SCORE
Moderately Effective
Based on 2 Researches
8
USERS' SCORE
Good
Based on 17 Reviews
8.9
Supplement Facts
Serving Size: 1 Tablet
Amount Per Serving
%DV
Vitamin C (as Ascorbic Acid)
1 g (1,000 mg)
1111%
Rose Hips Powder (Rosa canina) (fruit)
25 mg

Top Medical Research Studies

7
Effectiveness of Vitamin C on Colds
Vitamin C for the common cold and pneumonia.
Strong relevance to cold prevention
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.
Read More
9
Vitamin C improves cold tolerance
Application of Exogenous Ascorbic Acid Enhances Cold Tolerance in Tomato Seedlings through Molecular and Physiological Responses.
Directly addresses cold tolerance
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.
Read More

Most Useful Reviews

9.5
Effective for cold
My brother was right. I picked up a nasty cold that relapsed after 10 days of sick leave. It just wouldn't go away, even after several doctor visits and rounds of prescription drugs. An older brother living abroad laughed at me before revealing his secret: Vitamin C. He recommended "C-1000 with Rose hips, time released," advising me to take about 6,000 milligrams daily. After following his advice for a week, I felt better. Now I maintain about 2,000 milligrams daily for protection and share this with my friends suffering from colds.
Read More
9.5
Preventative measure
I’m astonished that the media doesn’t promote Vitamin C more; it’s affordable and safe. After suffering through a nasty cold last summer, I searched for preventative Options and found that Vitamin C can reduce the duration of colds significantly. I’m now prepared for future outbreaks and feel confident in my routine with these supplements.
Read More
9
Prevention method for cold
Seems to work well. I take one daily and prefer the time-released option, ensuring I don't overload my system with Vitamin C. Whenever I sense a cold coming on, I take another pill at night and during the day as needed. Doing this promptly prevents me from catching a cold. I’ve followed this routine for years, and it has served me well.
Read More

Medical Researches

SCIENTIFIC SCORE
Moderately Effective
Based on 2 Researches
8
  • All Researches
9
Vitamin C improves cold tolerance
Application of Exogenous Ascorbic Acid Enhances Cold Tolerance in Tomato Seedlings through Molecular and Physiological Responses.
Directly addresses cold tolerance
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.
Read More
7
Effectiveness of Vitamin C on Colds
Vitamin C for the common cold and pneumonia.
Strong relevance to cold prevention
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.
Read More

User Reviews

USERS' SCORE
Good
Based on 17 Reviews
8.9
  • All Reviews
  • Positive Reviews
  • Negative Reviews
9.5
Effective for cold
My brother was right. I picked up a nasty cold that relapsed after 10 days of sick leave. It just wouldn't go away, even after several doctor visits and rounds of prescription drugs. An older brother living abroad laughed at me before revealing his secret: Vitamin C. He recommended "C-1000 with Rose hips, time released," advising me to take about 6,000 milligrams daily. After following his advice for a week, I felt better. Now I maintain about 2,000 milligrams daily for protection and share this with my friends suffering from colds.
Read More
9.5
Preventative measure
I’m astonished that the media doesn’t promote Vitamin C more; it’s affordable and safe. After suffering through a nasty cold last summer, I searched for preventative Options and found that Vitamin C can reduce the duration of colds significantly. I’m now prepared for future outbreaks and feel confident in my routine with these supplements.
Read More
9
Prevention method for cold
Seems to work well. I take one daily and prefer the time-released option, ensuring I don't overload my system with Vitamin C. Whenever I sense a cold coming on, I take another pill at night and during the day as needed. Doing this promptly prevents me from catching a cold. I’ve followed this routine for years, and it has served me well.
Read More
9.5
No colds
I find this Vitamin C to be very potent, and I haven’t caught a cold or flu. I would definitely buy it again!
9.3
Reduces cold incidence
This vitamin C is a great price and tremendously effective in warding off colds. Before taking one tablet daily, I used to catch every cold my toddler brought home and suffered for two weeks. After increasing my dosage to two tablets when I felt a cold coming on, I was amazed that I barely caught anything! My husband and I will continue this, especially with flu season approaching. It's inexpensive and easy on the stomach.
Read More
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