Allergic Niacinamide: Symptoms, Causes, Treatment, and How to Know if You’re Truly Allergic If you think you are allergic to niacinamide because a serum caused redness, itching or burning, stop using that product. The symptoms alone cannot identify the ingredient responsible or distinguish allergy from irritation. Do not keep applying it to find out whether … Continue reading Allergic Niacinamide: Symptoms, Causes, Treatment, and How to Know if You’re Truly Allergic