Last update
3/28/2026
Reviewed By
Overview
SCIENTIFIC SCORE
Moderately Effective
Based on 2 Researches
8
USERS' SCORE
Moderately Good
Based on 999 Reviews
7.9
Supplement Facts
Serving Size: 2 Capsules
Amount Per Serving
%DV
Vitamin C(as Ester-C® Calcium Ascorbate)
1,000 mg (1 g)
1,111%
Calcium(as Ester-C® Calcium Ascorbate)
110 mg
8%
Citrus Bioflavonoids ComplexCitrus Bioflavonoids (Citrus limon) (fruit), Sweet Orange,Tangerine, Lime, Lemon, Acerola, Rutin, Hesperidin Complex(Citrus spp.) (fruit), Naturally Occurring Vitamin C Metabolites
400 mg
**
Top Medical Research Studies
9
We investigated whether a daily vitamin C supplement could reduce the risk of catching colds. Over two months, 168 people took either the supplement or a placebo. Results showed that those taking vitamin C experienced significantly fewer colds and shorter durations of severe symptoms compared to the placebo group.
This supplement was well-tolerated with minimal side effects, and participants were notably satisfied with it. Overall, it seems that vitamin C may not only help prevent colds but also assist in faster recovery from them.
This supplement was well-tolerated with minimal side effects, and participants were notably satisfied with it. Overall, it seems that vitamin C may not only help prevent colds but also assist in faster recovery from them.
Read More
7
Vitamin C alleviates cold symptoms
We looked into how vitamin C affects cold symptoms through a well-structured study involving 622 volunteers divided into treatment groups. They received either vitamin C or a placebo over a 15-week period.
While both vitamin C groups experienced milder illnesses compared to the placebo group, there were no significant differences between the two forms of vitamin C used. Interestingly, those taking vitamin C spent about 25% fewer days sick indoors. This suggests that while vitamin C can alleviate some cold symptoms, we might not need as high a dose as previously thought.
While both vitamin C groups experienced milder illnesses compared to the placebo group, there were no significant differences between the two forms of vitamin C used. Interestingly, those taking vitamin C spent about 25% fewer days sick indoors. This suggests that while vitamin C can alleviate some cold symptoms, we might not need as high a dose as previously thought.
Read More
Most Useful Reviews
7
Convenient vitamin C
211 people found this helpful
The order arrived very swiftly, just within 7 days. I appreciate Buds' packaging, with protective membranes that reassure me. I needed a gentle vitamin C on my stomach. It's essential, especially during cold seasons. I bought a large jar, which is very convenient, and offers a good shelf life. When I feel a cold coming on or notice early signs of malaise, I increase my dose accordingly. Health to all! Consult your doctor before use.
Read More
8
Preventive measures
196 people found this helpful
For my family, this is the first remedy I reach for at the initial signs of a cold. I also recommend taking it for preventive purposes.
Read More
7
Effective cold remedy
124 people found this helpful
This vitamin C is highly beneficial for our family when dealing with colds. The quality is exceptional, and 500 mg capsules are easy to swallow. It does not upset my stomach, and for prevention, I take 500 mg daily.
Read More
Medical Researches
SCIENTIFIC SCORE
Moderately Effective
Based on 2 Researches
8
- All Researches
9
We investigated whether a daily vitamin C supplement could reduce the risk of catching colds. Over two months, 168 people took either the supplement or a placebo. Results showed that those taking vitamin C experienced significantly fewer colds and shorter durations of severe symptoms compared to the placebo group.
This supplement was well-tolerated with minimal side effects, and participants were notably satisfied with it. Overall, it seems that vitamin C may not only help prevent colds but also assist in faster recovery from them.
This supplement was well-tolerated with minimal side effects, and participants were notably satisfied with it. Overall, it seems that vitamin C may not only help prevent colds but also assist in faster recovery from them.
Read More
7
Vitamin C alleviates cold symptoms
We looked into how vitamin C affects cold symptoms through a well-structured study involving 622 volunteers divided into treatment groups. They received either vitamin C or a placebo over a 15-week period.
While both vitamin C groups experienced milder illnesses compared to the placebo group, there were no significant differences between the two forms of vitamin C used. Interestingly, those taking vitamin C spent about 25% fewer days sick indoors. This suggests that while vitamin C can alleviate some cold symptoms, we might not need as high a dose as previously thought.
While both vitamin C groups experienced milder illnesses compared to the placebo group, there were no significant differences between the two forms of vitamin C used. Interestingly, those taking vitamin C spent about 25% fewer days sick indoors. This suggests that while vitamin C can alleviate some cold symptoms, we might not need as high a dose as previously thought.
Read More
User Reviews
USERS' SCORE
Moderately Good
Based on 999 Reviews
7.9
- All Reviews
- Positive Reviews
- Negative Reviews
7
Convenient vitamin C
211 people found this helpful
The order arrived very swiftly, just within 7 days. I appreciate Buds' packaging, with protective membranes that reassure me. I needed a gentle vitamin C on my stomach. It's essential, especially during cold seasons. I bought a large jar, which is very convenient, and offers a good shelf life. When I feel a cold coming on or notice early signs of malaise, I increase my dose accordingly. Health to all! Consult your doctor before use.
Read More
8
Preventive measures
196 people found this helpful
For my family, this is the first remedy I reach for at the initial signs of a cold. I also recommend taking it for preventive purposes.
Read More
7
Effective cold remedy
124 people found this helpful
This vitamin C is highly beneficial for our family when dealing with colds. The quality is exceptional, and 500 mg capsules are easy to swallow. It does not upset my stomach, and for prevention, I take 500 mg daily.
Read More
9
Gentle on stomach
122 people found this helpful
Ester-C is a good choice for vitamin C, as it’s gentle on the gastrointestinal tract. I used to take 1000 mg but have shifted to 500 mg for flexibility in dosing when I need less. I take it at the onset of cold symptoms, and I’ve experienced no side effects.
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7.5
Quick recovery
38 people found this helpful
My essential vitamin! I take it once in the morning and once before bed, and I should have started this habit long ago. I used to suffer from colds lasting a month, but after taking Ester-C, I felt better within just three days. I will surely buy it again; it is the best Vitamin C on the market!
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Frequently Asked Questions
10
Quick relief
3 people found this helpful
I prefer this vitamin C! After feeling a cold coming on, I took two tablets. Within 30 minutes, all the uncomfortable symptoms vanished completely! This is exceptionally effective against cold viruses! I am very impressed!
9
Immediate cold relief
6 people found this helpful
This vitamin effectively tackles the onset of a cold! Following a doctor's recommendation, I took 2000 mg on the first day, and it works well for me—my cold symptoms do not escalate, and I’m pleased to have found this supplement!
9
Cold symptoms vanish
4 people found this helpful
Excellent Drug! I take it myself and give it to children daily. We have forgotten what colds are. As soon as I notice the symptoms of a cold, I administer a loading dose of vitamin C in two capsules at two-hour intervals. The next day, usually, all symptoms disappear.
8
Effective for prevention
9 people found this helpful
Excellent, working vitamin C with bioflavonoids for good absorption. I take either this or Solaray or Nutribiotic. I typically take 500mg as a prophylactic dose, but if I sense a cold is starting, I increase it to 2-4 times, and it helps immensely!
9
Stops colds quickly
3 people found this helpful
An irreplaceable product, especially for preventing colds! If I notice symptoms or have been in contact with someone unwell, we take vitamin C every four hours with zinc and vitamin D. Usually, one day is sufficient to halt the illness.
9
Great for immunity
7 people found this helpful
Excellent vitamin C—I always keep it in the medicine cabinet. I drink it with my family at the first sign of a cold, taking 2 capsules daily, and we recover within a few days without reaching a high temperature. It's a brilliant aid for immunity!
10
Immunity support
3 people found this helpful
Ester-C has exceeded my expectations! Living in Siberia, I often suffered from colds. Since I began using this, I've hardly been ill, even during the fall when colds are common. Ester-C effectively supports immunity!
8
Lightened symptoms
5 people found this helpful
I bought this when I learned that taking C + zinc is necessary when ill with a cold. I must say, do take it! With the first signs of illness, I take a double vitamin C dose along with one zinc at mealtimes. After a few days, I felt completely well!
8
Reduced cold symptoms
2 people found this helpful
Excellent purchase! Ester-C is well absorbed and safe for the stomach. Regular intake during colds can reduce symptoms and shorten the duration of the illness. I take 1000mg in divided doses during cold season for better absorption.
References
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