You've probably seen the popular skincare ingredient bouncing around the Internet, but what is tretinoin exactly? It’s a prescription-only retinoid that’s commonly referred to as tret ...

Celebrities such as Hailey Bieber are swearing by a secret ingredient, a retinol alternative called tretinoin (pronounced tret-in-oh-in), aka retinoic acid, which, if you’re not all over TikTok ...

People build their skin-care routines around their beloved tretinoin (the common prescription retinoid), swapping tips for the dreaded adjustment period (moisturizer first, for slower absorption ...