THE STUDY LIBRARY

Follow the
footnotes.

Six selected papers. The finding is the beginning; the design and context make it useful.

4 original clinical studies · 2 overlapping reviews · Sources checked 20 October 2026

This is a curated introduction, not an exhaustive systematic review. It includes early work, placebo-controlled trials and recent syntheses. A review may contain a trial also listed here: do not add their participant counts.

How papers are selected

Showing all 6 papers

2004Original study

Petersen & Magnani

Efficacy and safety of vitamin C vaginal tablets in the treatment of non-specific vaginitis

100 women with non-specific vaginitisAbstract consulted

Double-blind, placebo-controlled randomized trial

Reported finding: After treatment, 14.0% in the vitamin C group and 35.7% in the placebo group still met the study’s vaginitis definition.
Keep in view: An older diagnostic definition and short follow-up matter. Seven participants were lost to follow-up. Two vitamin C recipients developed candidiasis; this observation alone does not establish causation.
Our reading: A useful early clinical signal, rather than a general claim about everyday vaginal wellness.

Read the original paper

DOI: 10.1016/j.ejogrb.2004.02.032

2006Original study

Polatti and colleagues

Vaginal pH-lowering effect of locally applied vitamin C in subjects with high vaginal pH

39 women with pH ≥5 and no evident vaginal infectionAbstract consulted

Randomized comparison of three active formulations

Reported finding: Vaginal pH fell in all three formulation groups after the first application. The study found no significant difference between formulations.
Keep in view: Every group received active vitamin C. There was no inactive placebo group. The measured outcome was acidity, not symptom relief or long-term health.
Our reading: Relevant to the acidification question; a pH result and a patient benefit are different endpoints.

Read the original paper

DOI: 10.1080/09513590600647441

2011Original study

Petersen and colleagues

Efficacy of vitamin C vaginal tablets in the treatment of bacterial vaginosis

277 women with bacterial vaginosisAbstract consulted

Double-blind, placebo-controlled randomized trial

Reported finding: Clinical cure was reported in 55.3% with vitamin C versus 25.7% with placebo in the intention-to-treat analysis.
Keep in view: This was a short-term study of a specific vaginal formulation. Some authors were manufacturer-affiliated. A much larger percentage sometimes quoted online comes from a selected subgroup.
Our reading: The all-randomized analysis is the clearest starting point when discussing this result.

Read the original paper

DOI: 10.1055/s-0031-1296197

2013Original study

Krasnopolsky and colleagues

Efficacy of vitamin C vaginal tablets as prophylaxis for recurrent bacterial vaginosis

142 women after successful antibiotic treatment for BVFull text consulted

Double-blind, placebo-controlled randomized trial

Reported finding: Six-month recurrence was 16.2% with vaginal vitamin C and 32.4% with placebo. The three-month difference was not statistically significant.
Keep in view: This asked about recurrence after antibiotic cure, using repeated monthly courses. It was funded by Polichem and included company-affiliated authors. Local irritation occurred in both groups.
Our reading: One recurrence trial is a reason to investigate further, with the treatment context kept intact.

Read the original paper

DOI: 10.4021/jocmr1489w

2026Review

Khaikin and colleagues

Intravaginal vitamin C for the treatment and prevention of bacterial vaginosis: a systematic review and meta-analysis

9 randomized trials; 1,107 participantsFull text consulted

Systematic review and meta-analysis

Reported finding: The review found potential short-term treatment and recurrence benefits, with low or very low certainty for key comparisons.
Keep in view: The search ran through May 2025. Only one included trial tested recurrence prevention. This is a synthesis of existing trials, not another group of newly treated participants.
Our reading: Read the apparent benefits alongside how confident the evidence allows us to be. Published online in 2025; print issue in April 2026.

Read the original review

DOI: 10.1097/AOG.0000000000006092

2026Review

Abedi and colleagues

Investigating the effect of vitamin C supplementation on bacterial vaginosis: a systematic review and meta-analysis

6 randomized trialsFull text consulted

Systematic review and meta-analysis

Reported finding: Pooled results favored vitamin C for vaginal pH and clue-cell outcomes. Discharge and whiff-test results were not statistically significant.
Keep in view: The search ended in October 2024. Trial selection and outcomes differ from the other 2026 review, and the underlying studies overlap.
Our reading: Different endpoints can tell different stories. The two reviews should not be added together as independent trial totals.

Read the original review

DOI: 10.4103/jehp.jehp_787_25