My pores around my nose are enlarged and produce a lot of sebum. Is niacinamide okay?

These days, the pores around my nose have gotten bigger and sebum has been coming out frequently, so I'm thinking about trying a niacinamide product.

I looked it up and it said it was effective for sebum control and pore care, so I'm looking into it, but I'm not sure if it's good for sensitive skin.

I also wonder if there is a problem if I mix it with other ingredients and if the effect changes depending on the order.

Those who have experience using it, please tell us honestly about the effects you have felt and the changes in skin texture and sebum.

If you are an expert, it would be helpful to create a routine if you could tell me the recommended concentration, usage cycle, and precautions when combining products.

I would also like to know, based on actual experience, to what extent pores can be reduced and sebum control can be expected with consistent use.