well that could be because it contains so many chemicals it would be difficult to narrow it down...I know someone who was sick for years... just a bit here, a bit there. They had done test after test after test...nothing, they were told it was "all in their head" and to basically 'get over it'. They landed with a doctor who upon doing his first examination with her, sniffed at her head and asked if she used hair spray... she did. He identified the chemical culprit and she was fine after eliminating it. It's hard to know because basically we are just a bag of chemicals and so is our food, and the creams we use, and the odours we smell. And no two bodies react the same way.
Well, that was an easy fix, too bad it wasn't as easy to find.