How Do Probiotics Affect Skin Health?

Probiotics show potential benefits for skin health, particularly in wound healing and improving reactive skin conditions, with evidence strongest for certain strains like Limosilactobacillus reuteri and Bifidobacterium longum.

Very low

Low

Moderate

High

Certainty not assessed

This analysis does not carry a graded certainty rating. Read the limitations section before drawing conclusions.

What the research shows

High-quality systematic reviews and randomized controlled trials indicate that probiotics can positively influence wound healing by reducing infection rates, enhancing re-epithelization, and modulating immune responses. Limosilactobacillus reuteri has demonstrated improved healing outcomes after oral and surgical wounds, while Bifidobacterium longum lysate has shown benefits in reducing skin sensitivity and improving skin barrier function in reactive skin. Topical application of probiotics also shows promise in accelerating wound closure in animal models. However, some studies report mixed or non-significant results, and the effectiveness may depend on the probiotic strain, wound type, and application method. Safety profiles are generally favorable with no serious adverse effects reported.

Best studied probiotic strains

Limosilactobacillus reuteri

High-quality randomized controlled trials (PMID: 40652540, 29726282) show improved wound healing after tooth extractions and oral wounds, with reduced complications and better patient-reported outcomes. Another RCT (PMID: 31157556) found subjective improvements in swelling and recovery after mandibular molar surgery.

Evidence supports oral administration for surgical and oral wound healing; effects on pain are less clear.

Bifidobacterium longum

A high-quality randomized controlled trial (PMID: 19624730) demonstrated that topical application of Bifidobacterium longum lysate improved reactive skin by reducing sensitivity, inflammation markers, and enhancing skin barrier recovery.

Topical application beneficial for sensitive/reactive skin; effects likely related to immune modulation.

Lactobacillus plantarum, Lactobacillus rhamnosus, Bifidobacterium longum (topical)

A low-evidence animal study (PMID: 35148901) showed that topical application of these strains accelerated excisional skin wound healing in rats, with different strains acting at different healing phases.

Promising for topical use but human data are limited.

Escherichia coli Nissle 1917 (bioengineered)

A low-evidence animal study (PMID: 41724969) using bioengineered bacterial extracellular vesicles showed accelerated wound healing via enhanced angiogenesis without toxicity.

Experimental approach with potential but limited clinical data.

View products containing microorganisms linked to this analysis

Who may benefit

Individuals recovering from surgical or oral wounds People with reactive or sensitive skin Patients at risk of wound infections or delayed wound healing

Safety

No serious adverse effects were reported across studies. Probiotics were generally well tolerated in oral and topical applications. Minor side effects were rare or absent.

Limitations

Evidence varies in quality and is sometimes limited by small sample sizes or pilot study designs. Strain-specific effects are important, and not all probiotics show benefits. More large-scale, well-controlled human trials are needed to confirm efficacy and optimal strains/dosages. Animal studies provide preliminary data but may not fully translate to humans.

PubMed sources

Study	Type	Year	PMID
Does Probiotic Consumption Enhance Wound Healing? A Systematic Review. Nutrients	Systematic Review	2021	35010987
Efficacy of Using Probiotics with Antagonistic Activity against Pathogens of Wound Infections: An Integrative Review of Literature. BioMed research international	Research Study	2019	31915703
Probiotics and Their Effect on Surgical Wound Healing: A Systematic Review and New Insights into the Role of Nanotechnology. Nutrients	Systematic Review	2021	34959817
Effect of probiotic lozenges containing Lactobacillus reuteri on oral wound healing: a pilot study. Beneficial microbes	Randomized Controlled Trial	2018	29726282
The Effects of Probiotics, Prebiotics and Synbiotics on Wound Infection: A Systematic Review. Current pharmaceutical biotechnology	Systematic Review	2025	38818910
Limosilactobacillus reuteri Improves Healing Following Fully Impacted Tooth Extractions: Randomized Clinical Trial. Oral diseases	Randomized Controlled Trial	2025	40652540
The 3-D configuration of excisional skin wound healing after topical probiotic application. Injury	Research Study	2022	35148901
Effects of -containing lozenges on healing after surgical removal of mandibular third molars: a randomised controlled trial. Beneficial microbes	Randomized Controlled Trial	2019	31157556
Bioengineered probiotics derived bacterial extracellular vesicle as bioactive nanocarrier for the local VEGF expression to accelerate wound healing. Journal of nanobiotechnology	Research Study	2026	41724969
Bifidobacterium longum lysate, a new ingredient for reactive skin. Experimental dermatology	Randomized Controlled Trial	2010	19624730