Leaving Shampoo on the Hair

Hello Dr. Rassman, I just have a question. How long should one leave the shampoo on the hair? I ask this ’cause I usually leave it on for quite some time (around 10 minutes), could this affect (or benefit) my hair or cause any other effects (hair falling out, etc)? Thanks.

You can leave the shampoo in your hair as long as you like. It should not cause hair loss, nor will it grow hair. It’ll just be a longer shower. Follow the directions on the shampoo label if you are still worried. Is there a particular reason you leave it in your hair for 10 minutes? That does seem quite excessive.