Vitamin B3 for skin: what to know

Niacinamide is a topical form of vitamin B3. It is used in cleansers, moisturisers, and leave-on serums for concerns such as dryness, excess oil, visible redness, and uneven-looking colour. Its role is supportive: it can help the outer layer of skin function as a better barrier, but it cannot diagnose or cure a rash, infection, or pigment disorder. Results depend on the formulation, regular use, and the reason for the skin change. The [Niacinamide](/materials/niacinamide/) guide gives ingredient-specific context.

Use a gentle cleanser, apply niacinamide as directed, and finish with a moisturiser. Use broad-spectrum sunscreen during the day when uneven tone is a concern, because ultraviolet exposure can deepen visible discolouration. Introduce one new active at a time and test it on a small area first. Avoid applying a new serum to broken, freshly peeled, or severely irritated skin. If your routine already contains retinoids, acids, or acne medicines, adding products slowly can help reveal which ingredient causes dryness or stinging.

Book an assessment for a new or changing pigmented patch, a rash that does not settle, painful lesions, bleeding, crusting, or symptoms involving the eyes. Stop niacinamide and seek prompt help for facial swelling, widespread hives, blistering, or breathing trouble. A clinician may recommend a different approach when the underlying issue is eczema, rosacea, acne, contact allergy, or another condition. Cosmetic improvement should not delay evaluation of a suspicious or rapidly changing mark.

What is causing my skin concern, and is niacinamide appropriate? Which products should not be combined with it? How can I protect a sensitive or damaged barrier? How long should I try the routine before reassessment? Should a changing patch be examined before I use a brightening product?