Can probiotics improve eczema symptoms in children?

How much do probiotics actually improve eczema symptoms?

The short answer is: a little, but not enough to replace standard treatments. A 2019 Cochrane review (the gold standard for medical evidence) pooled 24 trials and found that probiotics reduced the investigator-rated eczema severity score by about 3.9 points on a 103-point scale [11]. To put that in perspective, the minimum difference that patients notice is about 8.7 points, so this improvement is small and of uncertain real-world benefit. A more recent 2023 meta-analysis of 9 trials found a similar reduction of about 4.2 points [4], and a 2026 umbrella review (a review of reviews) confirmed a statistically significant decrease in eczema severity [3].

However, not all studies agree. The same Cochrane review found that probiotics probably make little or no difference in patient- or parent-rated eczema symptoms, and no difference in quality of life [11]. A 2026 meta-analysis of 13 trials found that probiotics only started to show a benefit after 2 months of treatment, and the effect was still small [6]. So while probiotics can help, the effect is modest and may take weeks to appear.

Are probiotics better for preventing eczema or treating it?

The evidence is stronger for prevention than for treatment. A 2021 meta-analysis of 21 studies found that probiotics given during pregnancy and early infancy reduced the risk of developing eczema by about 25% (odds ratio 0.75) [8]. A 2023 meta-analysis of 37 trials confirmed this, showing a 17% reduction in risk (risk ratio 0.83) [9]. The preventive effect was strongest when probiotics were given to both mothers during pregnancy and infants after birth, using Lactobacillus rhamnosus or mixed strains [8][9].

For treatment of existing eczema, the results are less convincing. The Cochrane review concluded that 'use of probiotics for the treatment of eczema is currently not evidence-based' [11]. A 2023 meta-analysis found that probiotics improved SCORAD scores but noted the evidence was limited and called for more high-quality studies [4]. The difference makes sense: probiotics may help shape a healthy immune system early in life, but once eczema is established, other factors (like skin barrier defects and inflammation) may be harder to reverse with gut bacteria alone.

Which probiotic strains work best, and when should they be given?

Not all probiotics are equal. The most studied strains are Lactobacillus rhamnosus GG (LGG) and Bifidobacterium lactis. A 2026 trial of B. lactis XLTG11 in 352 infants found it reduced eczema incidence by a statistically significant margin [1]. However, the largest US trial of LGG in 184 high-risk infants found no effect on eczema, asthma, or rhinitis by age 7 [2]. The key difference may be timing: the successful trial gave probiotics to infants daily for 6 months [1], while the failed trial gave them only for the first 6 months of life [2]. A 2024 study found that maternal probiotics during pregnancy and breastfeeding reduced eczema risk in children, regardless of whether the child had a genetic skin barrier mutation (filaggrin) [5].

Timing matters. A 2021 meta-analysis found that probiotics prevented eczema only up to age 2, not beyond [8]. A 2023 study found that probiotics given from early pregnancy did not reduce allergic diseases at age 1 or 2, except for recurrent wheezing at age 2 [7]. The best window appears to be from late pregnancy through the first 6 months of life, using a combination of Lactobacillus and Bifidobacterium strains [8][9]. Single-strain probiotics may be less effective than multi-strain mixtures [4][8].

About These Sources

This answer is built on 11 peer-reviewed studies — published from 2007 to 2026, 4 from 2024 or later, 6 in Q1 journals, collectively cited 100 times — selected as the most relevant from 15 studies that passed quality screening, drawn from 60 papers retrieved from a database of over 500 million.

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