The Impact of Probiotics on Acne Vulgaris: A Meta-Analysis of Randomized Controlled Trials.

Acne vulgaris is a multifactorial inflammatory skin disorder influenced by hormonal activity, microbial imbalance, and immune dysregulation. While conventional treatments such as antibiotics and retinoids remain effective, their long-term use is often limited by side effects, resistance, and poor adherence. This meta-analysis evaluated the efficacy of probiotics as an adjunct or alternative therapy for acne management. Four randomized controlled trials involving 227 participants were analyzed, showing that probiotic supplementation reduced acne severity scores (OR 0.48; 95% CI 0.29-0.79) and non-inflammatory lesion counts (mean difference (MD) -4.62; 95% CI -8.10 to -1.15) compared with controls. A trend toward improvement in inflammatory lesions was observed (MD -2.03; 95% CI -5.46 to 1.41) but was not statistically significant. Heterogeneity across studies ranged from moderate to high, reflecting variation in probiotic strains, formulations, and treatment durations. While these findings suggest a potential benefit of probiotics, the limited number and quality of trials warrant cautious interpretation. Larger, standardized clinical studies are needed to confirm efficacy and identify optimal probiotic regimens for acne management.