Most people think a 10% niacinamide serum is the fastest way to clear pores and stop breakouts. I thought the same thing. So I bought a bottle of The Ordinary Niacinamide 10% + Zinc 1% Serum ($6.50, 30ml) and used it every single morning for 30 days. Here is exactly what happened — the good, the bad, and the unexpected. […]