b12 injections mouth ulcers How does Vit deficiency cause ulcers? : r/biology Mouth Ulcers and Burning Gums:

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National Health and Nutrition Examination Survey data found that the normal serum MMA range for the 2.5th to 97.5th percentile of people 70 years, who were considered to be vitamin B12-replete and with normal kidney function, was 84 to 317 nmol/l (Mineva, 2019)

And not all patients have the same set of symptomssome deficient folks dont have any symptoms at all

Folate deficiency should be corrected, but B12 replacement should be started first to avoid worsening neurological damage