How to dilute 9, 12 or 35 per cent food-grade hydrogen peroxide to 6 per cent

Dilution of hydrogen peroxide for bacterial vaginosis

TL;DR

Using hydrogen peroxide for vaginal purposes requires a precise 6% mixture for effectiveness. This guide explains how to dilute 35%, 12%, and 9% hydrogen peroxide solutions to the desired 6% concentration, ensuring safe and proper usage. It also covers the mathematical formula for dilution and storage recommendations to maintain the solution’s integrity.

If you are using hydrogen peroxide for vaginal use, it’s typically most effective to use a six per cent mixture, however you may have purchased a different concentration. Here’s how to dilute your mixture properly.

How to dilute 35 per cent food grade hydrogen peroxide to a 6 per cent mixture

  • 1 part 35 per cent hydrogen peroxide
  • 4.83 parts water

This could look like 100ml hydrogen peroxide to 480ml water, or 1 cup hydrogen peroxide to 4.8 cups of water – figure out how much you need and work off that.

How to dilute a 12 per cent hydrogen peroxide solution to 6 per cent

  • One part 12 per cent
  • One part water

How to dilute a 9 per cent hydrogen peroxide solution to 6 per cent

  • One part 9 per cent
  • 1/2 part water

Only store liquid hydrogen peroxide in dark glass jars or bottles, tightly sealed, in the freezer. It won’t freeze, but it stops it from evaporating (yes, even through a tight lid) over time. How to use hydrogen peroxide as a douche

Mathematics of mixing hydrogen peroxide with water to use vaginally (if you are into that sort of thing):

Formula: C1V1 = C2V2 V1 = Volume of hydrogen peroxide solution needed to make the new solution C1 = Concentration of hydrogen peroxide solution V2 = Final volume of new solution C2 = Final concentration of new solution Example: Make 1 L (1000mL) of a 6% solution from a 35% Hydrogen peroxide solution. Plug values in: V1 x (0.35) = (1 L) x (0.06) Rearrange: V1 = [(1 L) x (0.06)] / (0.35) V1 = 171 mL Answer: Place 171 mL of the 35% Hydrogen peroxide solution into V1-V2 = 1000 mL – 171 mL = 829 mL of water



Jessica Lloyd - Vulvovaginal Specialist Naturopathic Practitioner, BHSc(N)

Jessica is a degree-qualified naturopath (BHSc) specialising in vulvovaginal health and disease, based in Melbourne, Australia.

Jessica is the owner and lead naturopath of My Vagina, and is a member of the:

  • International Society for the Study of Vulvovaginal Disease (ISSVD)
  • International Society for the Study of Women's Sexual Health (ISSWSH)
  • National Vulvodynia Association (NVA) Australia
  • New Zealand Vulvovaginal Society (ANZVS)
  • Australian Traditional Medicine Society (ATMS)
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