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Comparison · Pregnancy Smart

Best probiotics for pregnancy

Assigned clinical reviewerMichael Yuzefovich· MD, FACOGDraft · pending clinical reviewUpdated

How do the options compare?

Each row is judged on whether a named strain was actually studied for that outcome, how the reviewers rated the evidence, and what the label has to tell you before any of it applies to the bottle in your hand.

OptionStudied pregnancy doseGuideline supportNotes
Any product that names its exact strainNCCIH notes we still do not know how much of a probiotic people would have to takeDifferent types of probiotics may have different effects, so a result for one kind of Lactobacillus does not carry over to another Lactobacillus or to BifidobacteriumThe strain name is the only thing that connects the bottle in front of you to any published study.
Gut regularity and constipationStrain-specific rather than a single numberA 2014 review showed some benefit, particularly with Bifidobacterium lactisThe improvements were small, and the clearest signal came from older adults rather than pregnant ones.
Upper respiratory infectionsVarious strains and doses have been testedA 2015 evaluation found people taking probiotics may have fewer and shorter upper respiratory infectionsStudy quality was rated low, so this belongs in the modest add-on column rather than the season-changing one.
Infant eczema and allergyTaken by the pregnant parent, strain-specificA 2015 review found probiotics lowered atopic dermatitis risk in exposed infants, with no protective effect against asthma or hay feverResults in infants and children have been inconsistent from trial to trial, so this is a conversation to have rather than an expectation to hold.
Any probiotic sold as a dietary supplementNo pre-market approval step stands behind the dose on the labelSold as dietary supplements, probiotics do not require pre-market approval, and structure and function claims on the label are permitted without authorizationThe FDA warned in 2023 that premature infants given probiotics are at risk of severe, potentially fatal infections.
  • Not every probiotic strain works the same way, so a label that names its exact strain matters more than the word 'probiotic' itself. 1
  • Supplement makers, not the FDA, are responsible for proving a probiotic is safe before it ever reaches a shelf, so a real strain name and CFU count tell you more than the label's front-of-bottle promises. 2
  • For people managing gestational diabetes, some probiotic strains have eased insulin-resistance markers in pooled research, but the effect on fasting blood sugar itself has been too small to call meaningful. 3
  • Certain strains taken during pregnancy have lowered a baby's eczema rate in some trials, but other trials of the same strains found no difference, and none showed less asthma. 4
  • Across this research, the same pattern keeps showing up: the specific strain that was studied matters far more than the general idea of taking a probiotic. 5

Which option makes sense?

Buy the strain rather than the word, match that named strain to the outcome you actually care about, and read the evidence behind every row here as modest support rather than a settled result.

Disclosure: Pregnancy Smart makes supplements that overlap with some options above. This comparison describes the evidence, not our own product; where our formulation is relevant it is named.

Frequently asked questions

What should I actually look for on a probiotic label during pregnancy?

Look past the word 'probiotic' and check for a named strain, like Lactobacillus rhamnosus GG or Bifidobacterium lactis, along with a CFU count and an expiration date. A product that's vague about its strain is harder to match to any real research. Bring the label to your next appointment so your provider can weigh in.

Can a probiotic help with pregnancy digestion or constipation?

Some strains have modest evidence for easing constipation and bloating when paired with enough water and fiber. A probiotic alone isn't likely to solve stubborn constipation, but it can be a reasonable add-on to the basics. See our constipation guide for the full approach.

Will taking a probiotic lower my chance of gestational diabetes?

The evidence is genuinely mixed. Some pooled studies show a modest benefit for insulin-resistance markers, but a broader review looking across multiple such studies found the effect on fasting blood sugar itself too small to call meaningful. A probiotic isn't a substitute for your glucose screening or your provider's gestational-diabetes plan.

Could a probiotic during pregnancy lower my baby's eczema or allergy risk?

Some trials of specific strains taken during pregnancy have shown lower eczema rates in the baby, especially in families with a strong allergy history, but other trials of the same idea found no difference, and none showed less asthma. It's a reasonable thing to ask your provider about if allergies run in your family, but it isn't a guaranteed outcome.

Related in the library

References

  1. Probiotics: What You Need To Know (NCCIH)

    NIH · https://www.nccih.nih.gov/health/probiotics-what-you-need-to-know

  2. Dietary Supplements: FDA

    FDA · https://www.fda.gov/food/dietary-supplements

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.