The results of the meta-analysis showed that the use of probiotics in the adjuvant treatment of patients with NAFLD improved liver function and reduced ALT levels (mean difference [MD]: −0.07; 95% confidence interval [CI]: −12.95, −7.19), AST levels (MD: −11.90; 95% CI: −16.55, −7.25) and GGT levels (MD: −8.61; 95% CI: −14.74, −2.48); additionally, the treatment effect was more obvious when the treatment time exceeded 12 weeks. This evidence concerns the gene GPT and metabolic dysfunction-associated steatotic liver disease.