Just to add to this thread...

I have a reaction with the hair gel my "stylist" uses on me.

I noticed after coming home from a haircut that I would develop a headache, have trouble focusing and get irritable. Also, the skin on my scalp would begin to get a buring sensation and would hurt to the touch.

I started researching the components in makeup and hair products and it sounded more like ingredients in a chemical bomb. The MSDSs are readily available online for most chemicals.

It's entertaining and a little scary when you start to check out the products you never gave a second though to all your life.