shampoo

shampoo

a cleaning agent, usually liquid, for hair; usually consists of a detergent and perfume. Some, usually referred to as medicated shampoos, contain therapeutic substances such as parasiticides, antimicrobials, ketatolytic agents, and antiseborrheic compounds such as selenium sulfide.

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Patient discussion about shampoo.

Q. Does using hair shampoo and conditioner too often or in too excess cass hair loss?

A. Chemicals used for dying, tinting, bleaching, straightening or permanent waves can cause hair to become damaged and break off if they are overused or used incorrectly. Overstyling and excessive brushing also can cause hair to fall out if the hair shaft becomes damaged.
so it really depends on which shampoo you are using and what are the materials inside it. i heard from more then one hair dresser that conditioner can cause it and shampoo for dry hair that also contains conditioner. but it could be just an urban legend...