If you've been researching solutions for recurring BV (bacterial vaginosis), odour or thrush, you may have come across boric acid suppositories. Despite the name sounding clinical — or even alarming — boric acid has a well-established history of use in vaginal health, backed by decades of research. Here's what you need to know.
What Is Boric Acid?
Boric acid is a naturally occurring compound derived from boron, a mineral found in soil, water, and plants. In its pharmaceutical-grade form, it has mild antifungal and antibacterial properties, making it effective at restoring the vaginal environment when it becomes disrupted.
It is not the same as the harsh industrial chemicals the name might conjure. Medical-grade boric acid suppositories — like the RS Wellness Boric Acid Vaginal Suppositories — are formulated specifically for vaginal use in precise, safe concentrations.
How Does It Work?
A healthy vaginal environment is naturally acidic, with a pH between 3.8 and 4.5. This acidity is maintained largely by Lactobacillus bacteria, which produce lactic acid as a by-product. When this balance is disrupted — by antibiotics, hormonal changes, sexual activity, or other factors — the pH rises, creating conditions where harmful bacteria and yeast can thrive.
Boric acid works by:
- Lowering vaginal pH — restoring the acidic environment that supports healthy flora
- Disrupting biofilms — breaking down the protective layers that allow Candida and Gardnerella to persist
- Inhibiting microbial growth — creating conditions that are inhospitable to the organisms responsible for BV and thrush
Who Is It For?
Boric acid suppositories are commonly used by people who experience:
- Recurrent bacterial vaginosis (BV) that returns after antibiotic treatment
- Recurrent or azole-resistant thrush (vaginal candidiasis)
- General vaginal discomfort associated with pH imbalance
They are not a first-line treatment and are not suitable during pregnancy. If you are unsure whether boric acid is appropriate for you, consult your GP or a sexual health clinician.
What Does the Research Say?
A 2011 systematic review published in the Journal of Women's Health found boric acid to be a safe and effective alternative treatment for recurrent vulvovaginal candidiasis. More recent studies have also supported its use as an adjunct therapy for BV, particularly in cases where standard antibiotic regimens have failed.
How to Use Boric Acid Suppositories Safely
Boric acid suppositories are for vaginal use only — they must never be taken orally.
Ready to try? Our RS Wellness Boric Acid Vaginal Suppositories are made with a single active ingredient, encapsulated in vegan-friendly capsules, and designed for discreet, straightforward use.