I'm betting that it is fine.
I use Herbatint and Naturtint, and what a difference that made. I was using Loreal and the last time I used it, when I finsished washing and conditioning my hair, I bent over to dry it and got a migraine headache, and my alarms went off: BAD STUFF, don't use Loreal anymore. So I listened and started using natural hair tints.

OH, and Herbavita.

http://www.iherb.com/Hair-Coloring

check out the Natural hair color companies.

one of the henna sites i went to said that the chemicals in hair color can cause migrain breast cancer and bladder cancer