Researchers at the National Institutes of Health have found a correlation between an ingredient found in shampoos and nervous system damage. The experiments were conducted with the brain cells of rats and they show that contact with this ingredient called methylisothiazoline, or MIT, causes neurological damage.

Which products contain this chemical compound MIT? Head and Shoulders, Suave, Clairol and Pantene Hair Conditioner all contain this ingredient. Researchers are concerned that exposure to this chemical by pregnant women could put their fetus at risk for abnormal brain development. In other people, exposure could also be a factor in the development of Alzheimer's disease and other nervous system disorders.

The chemical causes these effects by preventing communication between neurons. Essentially, it slows the networking of neurons, and since the nervous system and brain function on a system of neural networks, the slowing of this network will suppress and impair the normal function of the brain and nervous system.

These finding were presented December 5th at the American Society for Cell Biology annual meeting.