What at home kit works best to tighten skin and reduce pore size?

I once saw an infomercial on this at home kit that what very convincing. (I know Im gullible) It was something that would tighten skin and reduce pore size. I remember that they had a girl test it for a month or something on only one side of her face. There was a significant difference. I never really tried any product off of infomercials even though I was really wanting to try the youthful essence. Any ideas on reducing pore size in general?