I found a thread on this topic and I was trying to find it again but i cant. well from reading the 'dont go looking for haiar care products without me book. I know that the :
--2 harshest shampoos which you NEED TO AVOID is Sodium Lauryl Sulfate and Ammonium Lauryl Sulfate. They are very harsh, they are mostly found in clarifying shampoos. Or for shampoos for Oily hair.
--somewhat harsh shampoo that is not gentle enough to use often- Ammonium Laureth Sulfate. not that bad for caucasian hair,just not a good choice for black hair.
--Mild shampoo gentle enough for everyday- sodium Laureth sulfate. (THIS IS WHAT YOU NEED TO START USING)
--2 very gentle shampoos- TEA Lauryl Sulfate and TEA Laureth Sulfate. these are mostly found in baby shampoos. I think it was mentioned that they do not do a good job at cleaning adult hair, or something like that.
So i hope this helps. Also remember that you can always add water to your shampoo so that you arent pouring an excessive amount of these drying agents on to your hair.