ビタミンB12ビタミンビーじゅうにMeanings1nounvitamin B12A water-soluble vitamin important for nerve function and red blood cell formation.ビタミンB12は主おもに動どう物ぶつ性せい食しょく品ひんに含ふくまれています。Vitamin B12 is mainly found in animal products.