It even cracked the code on formulating vitamin C that can't oxidize and a retinoid that won't irritate.
They'll render your concealer all but obsolete.
There's no one-size-fits-all way to correct them.
You, too, can avoid the flaky, gross shiz that appears on your face when you first start using a retinoid product. Just follow Dr. Fredric Brandt's super-simple steps.