Some people just canāt handle niacinamide. While itās usually a very friendly ingredient, itās still an active, so thereās a chance it can cause irritation. Also, you can have sensitivity to pretty much every ingredient, not only the actives, and usually people find out they canāt tolerate something when they buy a product. Some ingredients just arenāt compatible with everyone, which is sad, but also completely normalš£
while it can be a concentration thatās not right for you, there are sometimes people that respond better to niacinamide in lower concentration, if itās allergic or a sensitivity to niacinamide then thereās really nothing you can do and the only way is to stop using the sensitizing productš