The Inkey List Niacinamide Oil Control Serum There are 30,000 loves for this The Inkey List Niacinamide Oil Control Serum ($7) which, as its name implies, helps oily skin in particular. It's 10 percent concentration of niacinamide controls excess sebum and reduces blemishes while the hyaluronic acid also inside ensures its smoothly soaked up by skin, too. Image Source: sephora.com The Inkey List Niacinamide Oil Control Serum $7 from sephora.com Buy Now