Niacinamide: Does it actually help with sebum and pore control?

I've been concerned about sebum and pores lately, so I'm thinking about adding niacinamide to my routine.
I looked it up and it says that it can be found in serums or creams, but I'm not sure how effective it actually is.
I also wonder if it is suitable for sensitive skin and if there are any problems when used with other ingredients.
If you have used it, please share your honest review, including the degree of change, speed of change, and whether it irritates your skin.
I'd also like to hear expert opinions, so please let me know what the recommended concentrations are, how often they should be used, and if there are any precautions.
Please give us your opinions based on your actual experiences, such as whether your skin texture becomes smoother or sebum secretion is reduced with consistent use.