I used to use Neutrogena Pore Refining range of products and found that it worked. It was relatively cheap (compared to other products with serums and stuff) and I only used the wash and toner. The only downside is that you have to use it for a couple of weeks before you see results, and once you stop using it, your pores go back to their original size. So I'm guessing the mechanism of action is temporary, which might not be so good after all.

I've kinda given up on reducing my pore size. To hell with the nitty gritty details that we girls love to fuss on. What matters most is inner health.