The opening paragraph is precisely why so many people have moved to natural ingredient products and fragrance free. Some fragrance makers have new for formulas with “clean” ingredients, but they are still proprietary and come with a “trust us” promise. It’s interesting to see the specifics of what these products can do other than what’s advertised on the tin.
My skin care routine is "I showered in some not-so-distant past" and sunscreen. You hit diminishing returns very quickly. Showering more than once a week has no health benefits, it's just so that other citizens of your overcrowded city wouldn't complain about your natural smell.
Not showering for a week means I have a headache all day. So evidently not everyone is doing it for someone else.
That doesn't sound normal? Why would you get headaches from not showering? Never heard of such a thing.