It may not be the strawberry shampoo in itself but the change. I am a specialist in thin hair unfortunately and I notice if I use a thickening shampoo on a regular basis the thickening substances will weigh the hair down. So I have about 3 shampoos and change daily. I'll always make sure to have one that is said to strip the hair from other product residue (I am not sure about brands in the US but Neutrogena may have some) and make sure I have one against dry hair and one for more volume.