There are sites like ewg.org that'll give you an idea about what's considered safe to ingest or apply topically. Its telling when you have a laundry list of the composition of a shampoo. People then resort to "no poo" fads or spend their money trying to figure out why their skin reacts or hair dries.
Call me Future cuz Ive been hitting it with my parents old VCR since I was 14.