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Boric acid

Supplement mineral compound women's health
Aka: boric acid suppository
Brands seen in Singapore: Nutricost, AZO, pH-D Feminine Health, The Honey Pot Company, Vitamatic
Not medical advice. Check with your doctor or pharmacist before you start, stop or change the timing of anything you take.
How to use
What it’s for
Vaginal use in non-albicans or azole-resistant thrush
When to take
After azole treatment fails
Studied for
Courses ran 14–21 days
Pros & cons
Pros
  • Cdc: roughly 70% clinical and mycologic eradication
  • 600 mg once daily per vagina is the best-supported dose
  • In 52 women with recurrent bv, 88.5% reached nugent <4
Cons
  • Swallowing it is dangerous — 15,000–20,000 mg can kill
  • Contraindicated in pregnancy — safety data are lacking
  • Strengths and availability vary widely between products
Sources
  1. CDC — STI Treatment Guidelines, Vulvovaginal Candidiasis (non-albicans VVC) · read 2026-08-27
    what it says
    “600 mg of boric acid in a gelatin capsule administered vaginally once daily for 3 weeks … This regimen has clinical and mycologic eradication rates of approximately 70%”
  2. State-of-the-Art Review: Managing Vulvovaginal Candidiasis (Clin Infect Dis / Europe PMC 2026) — boric acid dose and pregnancy · read 2026-08-27
    what it says
    “boric acid is contraindicated in pregnancy because of a lack of safety data … most scientific and safety data supports the use of 600 mg of boric acid daily per vagina in a gelatine capsule.”
  3. Europe PMC 2026 VVC review — Table 2 treatment recommendations · read 2026-08-27
    what it says
    “Boric acid 600 mg p.v. for 14–21 days — For non-albicans Candida spp. and azole resistance. Not during pregnancy. Significant variation of availability, strengths and products”
  4. Intravaginal boric acid treatment for recurrent bacterial vaginosis: short-term effects on vaginal health parameters (Europe PMC 2025) — results and limits · read 2026-08-27
    what it says
    “Nugent scores decreased from 7.8 ± 0.8 to 3.1 ± 1.0 (p < 0.001), with 88.5% achieving scores < 4 … the single-arm retrospective design and limited follow-up preclude definitive conclusions about treatment efficacy.”
  5. Europe PMC 2025 boric acid BV study — safety counselling · read 2026-08-27
    what it says
    “the potential for serious toxicity if boric acid is ingested orally necessitates comprehensive patient education … the critical importance of keeping suppositories away from children and pets.”
  6. NIH ODS — Boron, Fact Sheet for Health Professionals (Recommended Intakes) — read via the archive.org capture of 16 Aug 2026, since ods.od.nih.gov 403s to direct fetch · read 2026-08-27
    what it says
    “The FNB found the existing data insufficient to derive an RDA, AI, or EAR for boron. The World Health Organization estimates that an acceptable safe range of boron intakes for adults is 1–13 mg/day”
  7. NIH ODS — Boron (Table 2: Tolerable Upper Intake Levels for Boron) — archive.org capture · read 2026-08-27
    what it says
    “The FNB established boron ULs for healthy individuals based on levels associated with reproductive and developmental effects in animals … 19+ years | 20 mg | 20 mg | 20 mg | 20 mg”
  8. NIH ODS — Boron (no Daily Value) — archive.org capture · read 2026-08-27
    what it says
    “Because the FNB has not established an RDA or AI for boron, boron does not have a DV.”
  9. NIH ODS — Boron (Health Risks from Excessive Boron) — archive.org capture · read 2026-08-27
    what it says
    “Symptoms associated with accidental consumption of boric acid or borax … include nausea, gastrointestinal discomfort, vomiting, diarrhea, skin flushing, rash, excitation, convulsions, depression, and vascular collapse … 15,000 to 20,000 mg can cause death in adults”
  10. NIH ODS — Boron (Interactions with Medications) — archive.org capture · read 2026-08-27
    what it says
    “Boron is not known to have any clinically relevant interactions with medications.”
  11. HSA — Guidelines on Prohibited and Restricted Ingredients in HS and TM, GL-CHPB-1-012 Rev. No. 001 (Oct 2025), Annex A row 14 · read 2026-08-27
    what it says
    “14. Boron — Restricted use in HS and TM — Maximum Daily Dose: When for oral use by general adult population, the maximum recommended daily dose should not provide more than 6.4mg”
  12. HSA — Health Supplements Guidelines (January 2026), Table 5: Minerals Limits · read 2026-08-27
    what it says
    “HS for use by the general adult population should not contain vitamins and minerals exceeding the stipulated limits stated in Tables 4 and 5 … Boron — 6.4 mg”
  13. HSA — Health Supplements Guidelines (January 2026), Table 6: Examples of Diseases/Conditions/Disorders Not Allowed for Health Supplements · read 2026-08-27
    what it says
    “HS must not be labelled, advertised or promoted for any specific medicinal purpose … Skin, hair and nails — Fungal infection … Others — Cancers, infectious diseases, inflammatory conditions or diseases”
  14. iHerb Singapore — Boric Acid category (default order, 1 - 10 of 10 results); first 5 distinct brands in page order · read 2026-08-27
    what it says
    “Nutricost, Women, Boric Acid, Vaginal Suppository, 600 mg … AZO, Boric Acid, Vaginal Suppositories, 600 mg … pH-D Feminine Health, Boric Acid Vaginal Suppositories … The Honey Pot Company, Boric Acid & Herbs … Vitamatic, Boric Acid, 600 mg”
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Updated 2026-08-29. Every line above traces to a numbered source. Kozen-X is not a medical device and does not give medical advice. It lists what published sources have written down — nothing more. A pair not listed is unrecorded, not cleared. Before you start, stop or re-time anything, talk to your doctor or pharmacist.