When I was in college my best friend started to lose his hair.  He was convinced that it was caused by the shampoo he was using and switched to another shampoo.  Of course his hair continued to fall out but then he claimed that he had used that shampoo too long.   When my hair started to thin,  my first thought was that my shampoo was causing the fall out.  I did take the time to contact my doctor before pursing a Thinning Hair Treatment.  He let me know that there was no way that my shampoo or any other one could be the cause of my hair loss.