Natural canker sore treatment | Contains vitamin b12: People with recurring mouth sores have been found to be deficient in vitamin b12 | Contains folate: Similar to vitamin b12, folate levels have also been found to be low in patients with recurrent mouth ulcers | Contains l-lysine: May be clinically effective in reducing recurrent aphthous ulcers | Contains Deglycyrrhizinated licorice (DGL): This form of licorice blocks the metabolism of certain prostaglandins which can improve healing of oral mucosal tissue