Research review
Does acidophilus help with yeast infections? What the research does and doesn't show
The evidence doesn't support acidophilus, alone, as a treatment for yeast infections. One trial found an acidophilus-containing multi-strain probiotic, added on top of standard antifungal treatment, reduced recurrence over 6 months versus placebo added the same way.
The evidence doesn't support acidophilus, alone, as a treatment or cure for a yeast infection. One trial found that adding an acidophilus-containing probiotic blend on top of standard antifungal treatment, as a 6-month maintenance routine, was followed by fewer recurrences than adding a placebo the same way — but that trial combined two bacterial strains with lactoferrin, tested them as an add-on to a drug both groups already received, and included only 48 women.
What the evidence doesn't support
It doesn't support acidophilus, on its own, as something that treats or cures a yeast infection — no trial has isolated a single acidophilus strain and tested it that way. It also doesn't support acidophilus as a replacement for antifungal treatment: the one relevant trial below gave every participant the antifungal drug clotrimazole first, and only then tested whether adding a probiotic blend changed the recurrence rate. This trial didn't test whether a probiotic can treat an active infection on its own — that's a different question from what it actually measured.
What the trials found
A randomized, placebo-controlled trial enrolled 48 women with recurrent vulvovaginal candidiasis, confirmed positive for Candida albicans. Every participant first received a course of clotrimazole, a standard antifungal drug, as induction therapy — both the group that would go on to get the probiotic and the group that would get placebo. After that, participants were randomized to an oral capsule containing the GLA-14 strain of L. acidophilus, the HN001 strain of L. rhamnosus, and bovine lactoferrin, or a placebo capsule, taken daily for 15 days and then as a monthly 10-day maintenance course for 6 months. Both groups improved after the initial clotrimazole course. Over the following 6 months, the probiotic-lactoferrin group had less itching and discharge at 3 and 6 months, and a lower recurrence rate than placebo — 33.3% versus 91.7% at 3 months, and 29.2% versus 100% at 6 months.
This trial tested a probiotic-lactoferrin combination as an addition to drug treatment, not against it — every participant received the same antifungal course first. It also combined two bacterial strains with lactoferrin rather than testing L. acidophilus alone, so it doesn't establish what acidophilus by itself would do, and the sample was small (48 women, one site type of infection). We didn't find a larger trial, or one isolating acidophilus alone, for vulvovaginal candidiasis or any other yeast infection.
Questions people ask
Will acidophilus help a yeast infection?
No trial has tested acidophilus alone against an active yeast infection. The trial above didn't treat an existing infection with a probiotic — it added a multi-strain blend after standard antifungal treatment and measured recurrence over the following months.
How much acidophilus should I take for a yeast infection?
There's no established dose for this use, because no trial has tested acidophilus alone for it. The trial above used a two-strain-plus-lactoferrin combination, not a single-ingredient acidophilus dose, so its dosing doesn't translate into a recommendation for an acidophilus-only product.
Can acidophilus prevent yeast infections?
The trial above suggests a multi-strain probiotic blend, taken after antifungal treatment, was followed by fewer recurrences than placebo over 6 months — but that's prevention of recurrence after treatment, in a small trial of a combination product, not a general prevention claim for acidophilus on its own.
Does acidophilus cause infections?
That's a different question from using acidophilus for a yeast infection. A survey of case reports found L. acidophilus among several Lactobacillus species occasionally linked to rare, serious bloodstream or heart-valve infections — almost always in people who were already diabetic, immunocompromised, or had another specific risk factor. See acidophilus side effects for that research in full.
When to talk to a doctor
A suspected yeast infection is worth confirming with a doctor, especially if it's the first time, symptoms are severe, or infections keep recurring — other conditions can cause similar symptoms. Acidophilus is not a treatment for an active yeast infection, and the trial above only tested a probiotic blend as an addition to antifungal drug treatment, not a substitute for it. If you're pregnant, immunocompromised, or have recurrent infections, talk to a doctor before starting any probiotic.
Related reading: acidophilus side effects and who should not take acidophilus.
Sources
- Randomised clinical trial in women with Recurrent Vulvovaginal Candidiasis: Efficacy of probiotics and lactoferrin as maintenance treatment A 6-month trial found that adding a two-strain probiotic (including the GLA-14 strain of L. acidophilus) plus lactoferrin, after standard antifungal treatment, reduced recurrence of vulvovaginal yeast infection compared with adding a placebo after the same antifungal treatment — this tested an adjuvant to drug treatment, not the probiotic against the drug, and used two bacterial strains plus lactoferrin together, not acidophilus alone.
- Lactobacilli Infection Case Reports in the Last Three Years and Safety Implications A 2022 survey of case reports found L. acidophilus among the Lactobacillus species occasionally linked to rare, serious bloodstream or heart-valve infections, almost always in people who were diabetic, immunocompromised, or had another risk factor like a prosthetic heart valve.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.