Best Probiotics for Vaginal Health (2026): GR-1/RC-14 Evidence
L. rhamnosus GR-1 and L. reuteri RC-14 are the strains with the most trials on oral supplementation reaching the vaginal tract. Our pick, Jarrow Fem-Dophilus, has both: 5 billion CFU, one capsule a day, $0.93 a day at the brand’s price. Most “women’s probiotics” do not contain these studied strains.
By Erin Rose Updated October 19, 2026 How we rank
Brand prices, checked October 19, 2026.
Our pick for: Most women
Jarrow Fem-Dophilus
First of the 6 we compare: both studied strains, with the count guaranteed until the best-by date
- Strains
- GR-1 + RC-14The two with vaginal trials
- Amount
- 5 billion CFULive cells, through the best-by date
- A day
- $0.93At the brand’s price
- Bottle
- 30 capsules$27.99 at the brand, one a day
- Storage
- Keep in the fridgePrinted on the label
- Testing list
- Not on a testing listNor is any other product here
Why we pick it One capsule holds both strains from the vaginal trials, L. rhamnosus GR-1 and L. reuteri RC-14. Jarrow guarantees 5 billion live cells until the best-by date, not just on the day it was made.
What you give up It needs the fridge once it arrives. RepHresh Pro-B costs a few cents less and needs no fridge, but its count is only promised on the day it was made.
Which probiotic is right for you?
The next two options also name GR-1 and RC-14. Choose by how you want to store it and how many strains you want.
Don’t want to keep it in the fridge?
RepHresh Pro-B has the same two strains, 5 billion CFU a capsule, and keeps at room temperature. The catch: the brand counts the 5 billion when the capsules are made, not at the best-by date, so you may get less by the end of the bottle. It costs $0.88 a day at Target; the brand has no store of its own.
RepHresh Pro-B
$0.88 a day · GR-1 + RC-14, 5 billion CFU when made
Want more strains in one capsule?
Thorne Women’s Daily Probiotic has 10 billion CFU of 8 strains. GR-1 and RC-14 make up 2 billion of that. Most of the rest is a four-strain mix with three small trials of its own. No trial has tested the whole capsule. It keeps at room temperature and costs $1.30 a day.
Thorne Women’s Daily Probiotic
$1.30 a day · 10 billion CFU, 2 billion of it GR-1 + RC-14
Already taking a women’s probiotic?
Check the label for GR-1 and RC-14. Many best sellers use a different mix of four strains: L. crispatus LbV 88, L. rhamnosus LbV 96, L. gasseri LbV 150N and L. jensenii LbV 116. AZO Complete Feminine Balance and Culturelle Women’s 4-in-1 have it. In three small trials with 118 women in all, this mix improved vaginal flora scores more than a placebo (de Vrese 2019). That is a real result, from fewer and smaller trials than GR-1 and RC-14 have had. Culturelle Digestive Daily holds only LGG; see what the trials found below.
Probiotics for vaginal health we compared, ranked
Products with both GR-1 and RC-14 come first, then the best-selling women’s probiotics without them. Costs are a day at each brand’s own price, one capsule a day.
| Probiotic | Cost a day | Why it is or is not a pick |
|---|---|---|
| Jarrow Fem-DophilusGR-1 + RC-14, fridge | $0.93 | Our pick: both strains, 5 billion through the best-by date |
| RepHresh Pro-BGR-1 + RC-14, room temperature | $0.88 | Both strains, 5 billion counted when made; no fridge |
| Thorne Women’s Daily Probiotic8 strains incl. GR-1 + RC-14 | $1.30 | Both strains, but only 2 of its 10 billion CFU; plus the four-strain mix |
| Culturelle Women’s 4-in-15 strains | $0.92 | No GR-1 or RC-14; the four-strain mix plus LGG |
| AZO Complete Feminine Balance4 strains | $1.02 | No GR-1 or RC-14; the four-strain mix, 3 small trials |
| Culturelle Digestive DailyL. rhamnosus GG | $0.60 | LGG only, which did not change vaginal flora in a trial |
What the trials found
In a trial of 64 healthy women, those who took GR-1 and RC-14 by mouth for 60 days were almost three times as likely to go from a bacterial vaginosis pattern without symptoms to a normal flora under the microscope: 37% against 13% on a placebo (Reid 2003). An earlier dose trial found that more than 100 million live cells a day were needed, and that LGG did nothing to vaginal flora (Reid 2001). Both trials came from the Canadian team that first studied these strains. Early papers call RC-14 by its old name, L. fermentum.
For bacterial vaginosis (BV), the strains have been tried alongside the antibiotic, not in place of it. Of 106 women in Nigeria who finished a trial run with the same team, 88% were cured at 30 days with the antibiotic plus the probiotic taken twice a day, against 40% with the antibiotic alone (Anukam 2006). Newer trials found less. In 126 women in China, adding the strains did not raise the cure rate (Zhang 2021). In 304 pregnant women, taking them daily did not prevent BV (Husain 2020).
A 2009 review of the BV trials found too little evidence to say probiotics treat it. So GR-1 and RC-14 have the best case of any oral probiotic, but they are not a treatment. If you have itching, odor or unusual discharge, see a doctor. BV and yeast infections need their own treatment.
Do probiotics help with UTIs or yeast infections?
Not clearly. A 2015 review of trials found no real drop in repeat UTIs with probiotics. In 252 women past menopause with repeat UTIs, GR-1 and RC-14 did worse than a daily antibiotic, 3.3 UTIs a year against 2.9, so they are no substitute for it. But the E. coli they carried did not become resistant to antibiotics, as it did in the antibiotic group (Beerepoot 2012). For yeast infections, a 2017 review found that adding a probiotic to antifungal medicine helped in the short term but not a month or more later, and the evidence was weak.
How to take it
One capsule a day, as the label says; some trials gave two a day. Keep Fem-Dophilus in the fridge. The trials on vaginal flora ran 28 to 60 days, so give it at least a month. Skip live probiotics, or ask your doctor first, if your immune system is weak from illness or medicine.
Questions people ask
Do oral probiotics really reach the vaginal tract?
Some can, but not reliably. In the 60-day trial, lab cultures found more vaginal lactobacilli in women taking GR-1 and RC-14 than in women on a placebo. But a 2021 trial in China rarely found the strains in the vagina. Most strains have never been tested this way.
Should I use oral or vaginal probiotics?
For a capsule you can buy, oral GR-1 and RC-14 have the most trials. A vaginal product made of L. crispatus, Lactin-V, cut the return of BV after antibiotics from 45% to 30% of women by week 12 in a 2020 trial, but it is not sold in stores.
Is it safe in pregnancy?
A 12-week trial in pregnant women found no safety problems with GR-1 and RC-14 taken daily, though the strains did not change vaginal flora more than a placebo. Ask your doctor or midwife before you start any supplement in pregnancy.
How we rank
Three things, in order: does the label name both GR-1 and RC-14; is the count promised until the best-by date or only on the day it was made; and what a day costs at the brand’s own price. No product here is on a testing list we check. We don’t score probiotics out of 10; dose depends on the strain. More on our method.
Sources
- Reid G, et al. “Probiotic Lactobacillus dose required to restore and maintain a normal vaginal flora.” FEMS Immunol Med Microbiol. 2001. PubMed 11750220
- Reid G, et al. “Oral use of Lactobacillus rhamnosus GR-1 and L. fermentum RC-14 significantly alters vaginal flora: randomized, placebo-controlled trial in 64 healthy women.” FEMS Immunol Med Microbiol. 2003. PubMed 12628548
- Anukam K, et al. “Augmentation of antimicrobial metronidazole therapy of bacterial vaginosis with oral probiotic Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14: randomized, double-blind, placebo controlled trial.” Microbes Infect. 2006. PubMed 16697231
- Senok AC, et al. “Probiotics for the treatment of bacterial vaginosis.” Cochrane Database Syst Rev. 2009. PubMed 19821358
- Husain S, et al. “Effects of oral probiotic supplements on vaginal microbiota during pregnancy: a randomised, double-blind, placebo-controlled trial with microbiome analysis.” BJOG. 2020. PubMed 30932317
- Yang S, et al. “Effect of Oral Probiotic Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14 on the Vaginal Microbiota, Cytokines and Chemokines in Pregnant Women.” Nutrients. 2020. PubMed 32019222
- Zhang Y, et al. “Probiotic Lacticaseibacillus rhamnosus GR-1 and Limosilactobacillus reuteri RC-14 as an Adjunctive Treatment for Bacterial Vaginosis Do Not Increase the Cure Rate in a Chinese Cohort: A Prospective, Parallel-Group, Randomized, Controlled Study.” Front Cell Infect Microbiol. 2021. PubMed 34295831
- de Vrese M, et al. “Impact of oral administration of four Lactobacillus strains on Nugent score - systematic review and meta-analysis.” Benef Microbes. 2019. PubMed 31012733
- Schwenger EM, et al. “Probiotics for preventing urinary tract infections in adults and children.” Cochrane Database Syst Rev. 2015. PubMed 26695595
- Beerepoot MA, et al. “Lactobacilli vs antibiotics to prevent urinary tract infections: a randomized, double-blind, noninferiority trial in postmenopausal women.” Arch Intern Med. 2012. PubMed 22782199
- Xie HY, et al. “Probiotics for vulvovaginal candidiasis in non-pregnant women.” Cochrane Database Syst Rev. 2017. PubMed 29168557
- Ravel J, et al. “Vaginal microbiome of reproductive-age women.” Proc Natl Acad Sci U S A. 2011. PubMed 20534435
- Cohen CR, et al. “Randomized Trial of Lactin-V to Prevent Recurrence of Bacterial Vaginosis.” N Engl J Med. 2020. PubMed 32402161
- Brand pages and labels, read October 19, 2026: Jarrow Formulas, Thorne, AZO, Culturelle; RepHresh at Target. Strain lists for Thorne from the NIH Dietary Supplement Label Database.