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 ...

which has been detected to contain hydroquinone and tretinoin; N Glow EWSB (hydroquinone, tretinoin and betamethasone 17-Valerate); and Glory Cosmetics Facecream (mercury). He said the ...