This site's own benefits section lists this specific fifth point: smoother, more even texture.
This site describes it directly: Folate's cellular renewal role is connected to this claim — worth reading this as the benefit most directly tied to Folate specifically, distinct from B12's separate cellular-renewal role.
This site ties both B12 and Folate to cellular renewal generally, but connects Folate specifically to texture here, while B12 connects to the separate "radiant, glowing skin" benefit — worth reading each ingredient's specific claimed outcome.