What type of study is this?

This is a Systematic Review study (also classified as: Meta-Analysis).

Efficacy of Oral Probiotics in Patients with Acne: A Systematic Review and Meta-Analysis of Randomized Trials

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Systematic review reveals probiotics may improve acne severity in patients, suggesting a beneficial alternative treatment.

Probiotics significantly alleviated disease severity grading in acne patients after 12 weeks of treatment.
The meta-analysis included nine studies with a total of 623 patients, focusing on the therapeutic effects of probiotics.
After 4 weeks, probiotics reduced total lesion count compared to the control, indicating promising results.
Benefits included improved skin hydration and sebum content, with no major adverse effects reported.

Lin et al. (2025) studied this question.

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