Using lactulose and probiotics – penis (Killing BV)

The penis and male urogenital tract benefits greatly from the presence of lactobacilli, the same as vaginas and the female urogenital tract.

When supporting clearance of bacterial vaginosis (BV)-related bacteria, the lactulose and probiotic can be a low-risk and helpful intervention.

It is recommended to use the more comprehensive Four-pronged Approach Fixer Box – Penis for best results, and use the lactulose and probiotic as supportive in other circumstances or between treatments.

There are limited methods of delivery for the inner reproductive tissue, so a lactulose and probiotic penis rub can be direct and supportive of establishing a protective penile and male reproductive system microbiome. The goal is to provide lactobacilli species and their food source to crowd out and compete with pathogens and disruptive microbes.

The benefit of this treatment is it can be used with a sexual partner, where the treatment can be pushed into crevices of the penis and vagina during penetrative sex. The urethra is a difficult-to-access area of the penis, as is the upper crevices around the cervix.

Order the Lactulose and Probiotic Kit

Safety first, kids!

  • Do not use lactulose if you suffer recurrent urinary tract infections (UTI) or are known to have aerobic vaginitis (AV)-related bacteria. Lactulose provides an energy source for these bacteria, fructose. Check your semen or urinary microbiome report against this list of bacteria that utilise lactulose (galactose and fructose).
  • Do not have unprotected sex with a partner with lactulose on the penis if your partner has either UTIs or AV or cytolytic vaginosis (CV) (lactobacillus overgrowth). It is safe to have sex when the treatment is washed off or if you are using condoms.
  • Lactulose is derived from dairy, do not use in dairy allergy. If you are lactulose intolerant, this will not affect the treatment, as lactose intolerance is only digestive.
  • Check all ingredients are safe for you to use topically.

If you experience a severe reaction from your treatments, stop immediately and seek medical care where appropriate. Any severe reaction may mean you are allergic to one of the ingredients or it’s just not for you.

If you experience a reaction you weren’t expecting, feel free to talk to us and get our thoughts.

What you need for treatment

  • Lactulose
  • Life-Space Women’s Microflora Probiotic

How to mix up and apply the lactulose and probiotic penis rub

Use a small amount of lactulose (about 1-2ml) and 5-10mls (about a teaspoon) of unchlorinated water in the palm or a small glass or cup (e.g. shot glass).

To dechlorinate tap water, boil water for 15-20 minutes, and the chlorine will evaporate off. (Chlorine kills bacteria, including good bacteria, so you want the chlorine out so the probiotics can survive.) Allow water to cool to a comfortable temperature before use.

Empty half of a capsule of the Life-Space Women’s Microflora probiotic into the lactulose and water mixture and stir well to dissolve as much as possible. Apply to the penis and scrotum and get into crevices, especially under the foreskin/head of the penis and urethral opening.

The timing of this treatment will matter for comfort, so aim to do the treatment after a shower when the skin is freshly cleansed and dry. Don’t leave the house with the treatment on in case it gets uncomfortable and needs to be washed off to go about your day.

Allow to dry as much as possible. This might mean going without pants for a while, but you can be the best judge of what’s comfortable.

Rinse the mixture off with water (not soap) after 15-30 minutes, or leave on overnight if it’s comfortable and wash off in the morning. It is useful to wear underwear to bed to avoid getting lactulose on bedding. Lactulose is sticky! The water thins it down, allows it to spread better across the genitals and dry a little more easily.

If irritation occurs, dilute the mixture with more water and/or reduce the dose. 

Remember the purpose: you want the probiotics to act as your army, so the longer they have to do their work, the better. They can’t work if washed off, and soap famously kills bacteria.

Use soap to wash your genitals before applying the treatment, and when washing the treatment off, use plain water. It is OK to use regular tap water with chlorine in the shower.

Use treatment daily or every other day for seven days, with a partner as often as they are using their treatments, or as recommended by your healthcare practitioner.

Sex with lactulose and probiotic treatment

If you have a sexual partner who is also being treated with lactulose and probiotics and can, have bareback sex with the treatment applied to you both. Ejaculate outside of the vagina.

Bareback sex with sticky lactulose comes with its own complications, so adding a little water can create a much nicer, slippery feeling. Experiment with what feels good.

If you are using condoms, you can add the treatment to the inside end of the condom (but you’ll need less) for a similar effect.

What to expect

You are all unique snowflakes and will react differently to the treatments. You do not want to get an overgrowth of lactobacillus on your penis, so if you experience unpleasant symptoms or signs of a problem develop, discontinue use, take a break or reduce the dose.

Lactulose is sugar syrup and is very benign as a substance, and is low-risk in terms of irritation. We would not expect you to experience irritation from lactulose. Keep an eye out and act accordingly.

Lactobacilli produce lactic acid, which may be irritating, so listen to your body and don’t ‘push through’ if things don’t feel right or there is irritation. Reduce the dose, frequency or give the treatment a break, and know that sometimes, a treatment may not be right for you or you need to take breaks.

Getting help

Remember if you have questions or are confused, we are here for you with free basic email support or join our online Facebook support group.

If you have a complex medical history, make an appointment with one of our specialist naturopaths.



(1) USD $34.95

Specially formulated probiotic for vaginal application to promote a healthy vaginal microbiome.

USD $44.95

Low-irritant, 100% natural, BV recovery support for everyone.

(8) Original price was: USD $9.95.Current price is: USD $0.00.

Unique, comprehensive BV, AV and 'mystery bad vag' treatment guide, one-of-a-kind system, with effective, innovative treatments.

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