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NOW Supplements Vitamin C Crystals
SCIENTIFIC SCORE
Moderately Effective
Based on 2 Researches
8
USERS' SCORE
Good
Based on 10 Reviews
8.6
Supplement Facts
Serving Size:  1/4 Level Teaspoon (1.1 g)
Amount Per Serving
%DV
Vitamin C (Ascorbic Acid)
1.1 g (1,100 mg) 
1222% 

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

8.8
Gentle on stomach
Good stuff. I purchased the Now fine ascorbic acid powder a few weeks ago. It’s much easier on my stomach compared to the Nutri Biotic crystalline powder. If I ever feel a cold coming on, I take a teaspoon mixed with orange juice. I plan to take one level teaspoon every day, even in summer. I’ve looked into Linus Pauling, who took 14 grams of vitamin C powder every day and lived to 93.
Read More
10
Haven't been sick
I haven't been ill in years. A friend recommended mega-dosing on Vitamin C. Initially, I took large pills until I discovered this product. Now, I won't use anything else! Just 1/2 teaspoon in water each morning gives me a refreshing lemony flavour I enjoy. Whenever I sense anyone around me is sick or feel the slightest sniffle, I take extra. Since starting this, I've not had a cold in over two years!
Read More
10
No colds
This is the best way to maintain vitamin C serum levels. I add approximately 1/4 teaspoon to a litre of water with a pack of propel, which has my doctor's approval. I'm now at about 4 grams a day and drink plenty of water to prevent kidney stones, which run in my family. Remarkably, I haven’t experienced a cold in three years while on vitamin C.
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 10 Reviews
8.6
  • All Reviews
  • Positive Reviews
  • Negative Reviews
8.8
Gentle on stomach
Good stuff. I purchased the Now fine ascorbic acid powder a few weeks ago. It’s much easier on my stomach compared to the Nutri Biotic crystalline powder. If I ever feel a cold coming on, I take a teaspoon mixed with orange juice. I plan to take one level teaspoon every day, even in summer. I’ve looked into Linus Pauling, who took 14 grams of vitamin C powder every day and lived to 93.
Read More
10
Haven't been sick
I haven't been ill in years. A friend recommended mega-dosing on Vitamin C. Initially, I took large pills until I discovered this product. Now, I won't use anything else! Just 1/2 teaspoon in water each morning gives me a refreshing lemony flavour I enjoy. Whenever I sense anyone around me is sick or feel the slightest sniffle, I take extra. Since starting this, I've not had a cold in over two years!
Read More
10
No colds
This is the best way to maintain vitamin C serum levels. I add approximately 1/4 teaspoon to a litre of water with a pack of propel, which has my doctor's approval. I'm now at about 4 grams a day and drink plenty of water to prevent kidney stones, which run in my family. Remarkably, I haven’t experienced a cold in three years while on vitamin C.
Read More
8.3
Shortened colds
This product has greatly benefitted our health. We've purchased it for years and it aids us in so many ways! When we feel a cold coming on, we take extra; our colds frequently last only a day or two. We use it regularly, even when well, but increase the dosage when illness strikes. Not only does it help with cold symptoms, but it has also alleviated my acid reflux, improved rosacea, and reduced fine lines around my eyes.
Read More
7.5
Effective for cold
I like this product. I used it internally and externally, and it has given me the results I expected. I had a very bad cold, and it definitely helped me recover. I also use it in a spray bottle mixed with water on my face to clear and strengthen my skin. I'm satisfied with the results. As you know, vitamin C produces collagen. I didn't give it a 5-star rating as there could be a better vitamin C available.
Read More
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