J Lo is a big glycolic acid fan
"As for her flawless skin, that radiance isn’t just the result of workout flush. The L’Oréal Paris spokeswoman says she loves “glycolic acid to get that healthy glow and clear skin. I never go to bed without taking my makeup off, [and I use] night creams to keep my skin hydrated. As for daytime, SPF is k-e-y. She faithfully uses the brand’s moisturizers with SPF “every single day. You have to protect your skin.”