This twice-daily serum is great for oily, blemish-prone skin, and several users say it’s a key product in their skin care routines.

From years-long users to first-time implementers, so many reviewers say that introducing this serum into their daily skin care routines has done wonders for their skin, with one even calling it a “miracle worker” for tightening skin.

“I’ve been using The Ordinary Niacinamide 10% + Zinc 1% for a while now, and it has honestly become a must-have for my daily routine,” says one user. “What I love most is how it keeps my skin’s oil in check-I’ve noticed my forehead is less shiny, giving me more of a healthy glow rather than an oily mess. It’s been incredible for smoothing out my skin texture and making my pores look a lot more refined. Since I started applying it twice a day, my skin feels so much more radiant and hydrated.”

“What really impressed me is how visibly it helped balance my skin,” says another reviewer. “Within the first couple of weeks, I noticed a reduction in excess oil production—especially in my T-Zone. My skin looked less shiny throughout the day, and my pores appeared more refined.”

The niacinamide and zinc ingredients really can work wonders.