You want smaller pores. I get it. Two serums dominate the conversation: The Ordinary Niacinamide 10% + Zinc 1% ($6.50) and Paula’s Choice 10% Niacinamide Booster ($44). Both deliver the same active percentage. One costs seven times more. Which one actually shrinks pores? I’ve tested both on combination, oily, and acne-prone skin for six weeks.…