PlainPill
Supplement

Ester-C

Based on 3 first-hand reports and 2 meta-analyses & systematic reviews in the medical literature. Ranked #3244 of 4,149 overall.

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6
User score
Mostly negative
0% positive0% mixed33% negative67% unclear

Of reports that state an outcome, 0% are positive.

Clinical research
BModerate research base
2
meta-analyses
3
RCTs
192
papers

What Ester-C does, according to users

Of the people who reported each effect, the share who said it got better.

No specific effects reported yet.
betterno changeworse

What the research says

Systematic reviews and meta-analyses from PubMed, with their published conclusions.

BModerate research base

At least one meta-analysis, or 5+ randomized controlled trials. The grade measures how much human research exists — read the conclusions below for what it found.

Nutrients · 2025 · Meta-analysis / systematic review
Enhanced Vitamin C Delivery: A Systematic Literature Review Assessing the Efficacy and Safety of Alternative Supplement Forms in Healthy Adults

Conclusion: Studies highlight the advantages of Calcium ascorbate EC over traditional ascorbic acid in terms of its tolerability and its potential to increase leukocyte vitamin C concentrations, crucial for immune function and protection against infection. However, further research is required to conclusively establish its effects on immune health.

PubMed 39861409 ↗

Dosage people report

As stated by users — not a recommendation. Follow the label or your doctor.

2x dailyas reported

Reported side effects

How often each side effect came up across all reports.

No side effects reported so far.

What users say

First-hand experiences, quoted verbatim. We show one positive and one negative where both exist.

No first-hand experiences with a clear outcome yet.
Top discussions (3)

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User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 3, 2026. How we rate