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Forest plot of the meta-analysis on the comparison of serum vitamin levels before and after successful H. pylori eradication therapy (n1: number of patients after eradication therapy; n2: number of patients before eradication therapy); After successful H. pylori eradication, serum vitamin B12 increased (SMD = 1.85; 95% CI: 0.81–2.90; P < 0.001; I2 = 96.0%); H. pylori eradication did not increase the serum vitamin C level (SMD = −0.32; 95% CI: −1.56–0.91; P = 0.002; I2 = 79.7%).
