You don't need to have enlarged pores to use this product. While niacinamide is indeed helpful for this concern, the main purpose of this serum is to even out skin tone, and help build a stronger, healthier barrier. Keep in mind that skin has pores from head to toe and they can become enlarged anywhere on the body, especially where there are more oil glands (the chest and upper back for example). Pores are but one concern multi-tasking ingredient niacinamide can address.