Vitamin B12 (cobalamin) ek cobalt-containing vitamin hai jo topically use hota hai skin ko condition karne ke liye. Iska research suggest karta hai ke skin barrier function ko support karta hai aur inflammatory conditions ko manage karne mein helpful ho sakta hai, jaise atopic dermatitis mein. Skin care products mein B12 ko moisturizing aur skin-soothing benefits ke liye use kiya jata hai.