Open pores get a lot of blame for skin that looks "textured" or uneven, but they're also one of the most misunderstood skin concerns out there. Pores don't have muscles, so they can't physically open or shut like a valve. What actually changes is how much oil, dead skin, and debris sits inside them at any given time, and that's exactly why a well-formulated niacinamide serum for open pores has become such a common starting point. It doesn't try to alter the pore's structure so much as work on what makes it look bigger in the first place.

That's usually paired with sun protection, and for good reason: unprotected sun exposure is one of the biggest reasons pores end up looking more prominent as skin ages. A niacinamide serum for open pores alongside a daily, broad-spectrum sunscreen spf 50 tends to hold onto results better than the serum alone, since sun damage can undo a lot of the progress a pore-focused routine builds over weeks.