This isnt a BAD thing for me… but this product is very strong and some people might have problems with purging or getting a damaged skin barrier or flaky skin or red skin. Like i said, none of this happened to me because my skin can handle a LOT. But i do know it would be too strong for some people if they’re just getting into using tretinoin. And if you ARE just getting into using tretinoin i would recommend starting at 0.025% or 0.05%. Or even using this once a week but buffering with a thick moisturizer