Probiotic Applications in Allergy Prevention and Management

Allergic disorders arise from inappropriate immune responses to environmental antigens, often manifesting as atopic dermatitis, allergic rhinitis or asthma. Probiotics—live microorganisms that confer health benefits when administered in adequate amounts—have attracted substantial interest as modulators of host immunity and mucosal barrier function. By shaping gut microbial communities, probiotics can enhance production of short-chain fatty acids, promote regulatory T-cell differentiation and reinforce epithelial integrity, thereby favouring immune tolerance over hypersensitivity. Clinical and preclinical studies have explored oral, intranasal and early-life interventions, revealing both preventive and therapeutic potential. However, variability in strain selection, dosing regimens and host factors underlines the need for standardised protocols. Ongoing research aims to translate mechanistic insights into safe, evidence-based strategies to reduce allergy incidence and severity worldwide.

Research from Nature Portfolio

Retrospective analysis of infant probiotic supplementation during breastfeeding indicates that although early exposure marginally increased Bifidobacterium abundance at one week and transiently elevated secretory IgA, it did not durably alter faecal microbiome composition. Unexpectedly, children whose mothers had taken probiotics experienced higher rates of mucosal infections in toddlerhood, signalling that routine supplementation in early infancy warrants careful reassessment. This work underscores the complexity of host–microbiome interactions and highlights the imperative for long-term safety evaluations before recommending probiotics for allergy prevention in healthy infants.

Probiotic Applications in Allergy Prevention and Management publication trend

The graph below shows the total number of articles in probiotic applications in allergy prevention and management across all publications each year (not limited to Nature Index journals).

Technical terms

Allergic sensitisation: The process by which initial exposure to an allergen primes the immune system to react upon subsequent exposures.

Outer membrane vesicles (OMVs): Nano-sized particles released by Gram-negative bacteria containing proteins, lipopolysaccharides and other immunomodulatory molecules.

Eosinophilia: An increased number of eosinophils in tissues or blood, commonly associated with allergic inflammation.

Th2 cytokines: A subset of T helper cell mediators (for example, IL-4, IL-5, IL-13) that drive allergic inflammation and IgE production.

SCORAD index: A clinical tool (Scoring Atopic Dermatitis) used to quantify severity and extent of atopic dermatitis.

Regulatory T cells (Treg): Immunosuppressive lymphocytes that maintain immune homeostasis and prevent excessive inflammatory responses to non-harmful antigens.

References

1. Extracellular vesicles of the probiotic bacteria E. coli O83 activate innate immunity and prevent allergy in mice. Cell Communication and Signaling (2023).
2. Effect of early postnatal supplementation of newborns with probiotic strain E. coli O83:K24:H31 on allergy incidence, dendritic cells, and microbiota. Frontiers in Immunology (2023).
3. Probiotic supplementation and associated infant gut microbiome and health: a cautionary retrospective clinical comparison. Scientific Reports (2018).
4. Single-Strain Probiotic Lactobacilli for the Treatment of Atopic Dermatitis in Children: A Systematic Review and Meta-Analysis. Pharmaceutics (2023).