Skip to main content

Loading Pregnancy Power Hour...

Skip to main content
Pregnancy Power HourPregnancy Power Hour
HomeJust Found Out?How It WorksResourcesFAQsBook Your Session
Pregnancy Power HourPregnancy Power Hour

Pregnancy Power Hour

For Birthing People Everywhere

Just Found Out?PostsResourcesBook Your SessionWork With BrittanyFAQsContactMy Account

Explore

  • Due Date Calculator
  • By Week
  • Conditions
  • Can I…?
  • Foods
  • Nutrition
  • Exercise
  • Lifestyle
  • Prenatal Tests
  • Birth Options
  • Postpartum

Join our community

Stay updated with pregnancy tips and consultation updates.

© 2026 Total Ventures LLC. All rights reserved.

Privacy PolicyTerms of ServiceTerms of SaleMedical DisclaimerCookie Policy
Probiotics in the third trimester | Pregnancy Power Hour
← All nutrients

Nutrition · trimester 3 · Phytonutrient

Probiotics in the third trimester

In the third trimester, probiotics are explored for their potential role in supporting a balanced microbiome, particularly in relation to the Group B Strep (GBS) colonization assessment.

2 min read

Quick answer

In the third trimester, probiotics are explored for their potential role in supporting a balanced microbiome, particularly in relation to the Group B Strep (GBS) colonization assessment.

The third trimester often brings a focus on preparing for birth, and for many, this includes considering factors like Group B Strep (GBS) colonization. Probiotics, particularly certain strains, have been explored for their potential role in supporting a balanced microbiome, which may be relevant as your body prepares for the GBS colonization assessment typically performed around 36 weeks. While research is still preliminary, the idea of supporting your body's natural flora through food and considered supplementation is an option many parents explore.

When we talk about probiotics, we're referring to beneficial microorganisms that can support gut and vaginal health. The good news is that probiotics from food sources like yogurt, kefir, and other fermented foods, along with most supplements, are generally considered safe during pregnancy. Specifically, Lactobacillus rhamnosus and Bifidobacterium strains have the most extensive safety data available for use during pregnancy, offering a calm and clear path for those interested in exploring this area. Understanding these specific strains can help you make more informed decisions when looking at supplement labels.

Beyond the GBS conversation, some preliminary research, including reviews like those from Cochrane, suggests other possible benefits. These include a potential reduction in bacterial vaginosis recurrence, and for some, even a role in gestational diabetes management. It's important to remember that these areas are still under active investigation, and your care provider remains your best resource for personalized guidance. Just as you might consider your overall nutrient intake, perhaps focusing on Vitamin D in the second trimester for bone health or Vitamin B6 in the first trimester for nausea support, thinking about your microbiome can be another layer of holistic wellness.

As you near the end of your pregnancy and begin to look ahead to the postpartum period, certain probiotic strains are also being studied for their potential to support maternal health post-birth. For instance, Limosilactobacillus reuteri and L. fermentum have been researched for their role in mastitis prevention, which can be a concern for some parents during breastfeeding. While this is a postpartum consideration, the third trimester is a time for preparation, and understanding these potential supports can contribute to your overall confidence. This forward-thinking approach is similar to how we might consider Vitamin D in the third trimester for both maternal and infant bone health.

If you choose to explore probiotic supplements, quality is a key consideration. The market offers a wide variety, and the effectiveness can vary enormously between brands. Opting for third-party tested products can offer greater assurance regarding what you're actually consuming. Remember, a food-first approach is always a wonderful foundation. Enjoying foods rich in live cultures, such as pasteurized commercial yogurt where beneficial bacteria are added after the heating process, is a practical and accessible way to incorporate probiotics into your daily rhythm. Ultimately, you get to decide what feels right for your body and your baby, always in collaboration with your healthcare team.

Free · personalized to you

Get your First-Trimester Read

A short read from Brittany, tuned to your week and what’s weighing on you most — in your inbox in about 5 minutes.

Get my read →

Common questions

Are probiotics safe during the third trimester?+

Probiotics from food (yogurt, kefir, fermented foods) and most supplements are generally considered safe in pregnancy, with Lactobacillus rhamnosus and Bifidobacterium strains having the most safety data.

Can probiotics help with GBS in the third trimester?+

Some probiotic strains have been studied for a potential reduction in GBS colonization, though research is preliminary. Your provider is your best resource for specific guidance.

What probiotic strains are most studied for pregnancy?+

Lactobacillus rhamnosus and Bifidobacterium strains have the most pregnancy safety data. Limosilactobacillus reuteri and L. fermentum are studied for mastitis prevention postpartum.

Brittany Nance

“Pregnancy is under-supported at every week. This is the kind of clear, calm guidance I give my one-on-one clients — and the questions worth taking back to your provider.”

Brittany Nance · Pregnancy Wellness Consultant · full-spectrum doula

Need help building a pregnancy nutrition plan that fits your life? Book a virtual consultation.

Book a consultation →

Want this kind of read in your inbox?

I send a short, doula-perspective note once a week — pregnancy reads worth your time, no fluff.

No spam. Unsubscribe anytime. Wellness info, not medical advice.

Written by Brittany Nance, Pregnancy Wellness Consultant· BADT Full Spectrum Doula · Founder, Pregnancy Power Hour
Last reviewed July 1, 2026

This is evidence-informed education from a birth-doula perspective, not medical advice. Always discuss your individual situation with your prenatal care provider.

Keep reading

  • RelatedProbiotics in the second trimesterIn the second trimester, probiotics continue their important role in supporting your vaginal microbiome, with emerging research exploring their potential connection to GBS reduction.
  • RelatedAre probiotics safe during pregnancy?Probiotics from fermented foods and most supplements, particularly Lactobacillus rhamnosus and Bifidobacterium strains, are generally considered safe during pregnancy.
  • RelatedProbiotics in the first trimesterPreliminary research suggests probiotics in the first trimester might influence morning sickness and miscarriage risk, offering a calm, evidence-based option for support.
  • RelatedFermented Foods (Kimchi, Sauerkraut) in the third trimesterIn the third trimester, commercially produced, pasteurized fermented foods like kimchi and sauerkraut are generally fine, offering potential gut support, but consider sodium content and sourcing for unpasteurized versions.
  • RelatedGreek Yogurt in the third trimesterGreek yogurt in the third trimester offers a gentle, nutrient-dense way to meet increased protein and calcium needs while supporting gut health as your body prepares for birth.
  • RelatedCollagen in the third trimesterIn the third trimester, collagen supplements primarily contribute to general protein needs, though specific pregnancy benefits are not yet established by evidence.