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Foundation is the makeup you use to even out your complexion.
A hair regimen is the products you use on your hair.
I don't use makeup really, if you want to know why i'd rather take it in a private conversation as its rather personal, as I feel most people would just harass me on here, there's some blocklanders(Furdle, Tayasaurus, and Jirue mainly) I've talked about it with though. (not why I don't use makeup, but more of the actual thing behind it, which is a completely different thing)
And hair regimen, I'm not sure if you want actual names of the things I use or not. But I use straighteners quite alot (I think its called like that in english atleast), and a bunch of scharzkopf products, once again I'm not too sure if this is what you actually mean, sorry.