Item: The Ordinary Niacinamide 10% + Zinc 1% ($6)
What our editor said: "Niacinamide is one of those ingredients that you always hear about, but you should own more products that contain it. The thing is, if you have acne-prone skin, it's key. It flushes out pores to prevent future breakouts and in the case of [this serum, it] uses niacinamide in tandem with zinc PCA to control sebum production." — Samantha Sasso, associate beauty editor, Native
If you want to read more, here is the complete review.