i live in an old city, so totally get the environmental toxins concern.
however, with my improved diet and sleep, my skin and hair are MUCH healthier. good hydration is also key.
btw, i haven't used shampoo in nearly a year, but do use an all-natural conditioner, and deep-condition with coconut oil a few times per week.
As I ate the oysters with their strong taste of the sea and their faint metallic taste that the cold white wine washed away, leaving only the sea taste and the succulent texture, and as I drank their cold liquid from each shell and washed it down with the crisp taste of the wine, I lost the empty feeling and began to be happy and to make plans.
– Ernest Hemingway