Yep, those thickening/de-frizzing/volumizing/mositurizing shampoos contain ingredients that don’t easily rinse off the hair and scalp and that’s not good. They can dull hair, weigh it down and even worse, can block the follicle and lead to hair loss!
When a shampoo promises to do more than clean, i.e. thicken, de-frizz etc. beware!!! It can’t do those things without leaving residues behind that stick to your hair. The problem is they can also stick to your scalp and that’s just not healthy!
If you want frizz-free hair or thicker hair don’t ask your shampoo to do that. Leave those tasks to conditioners or styling products that don’t get massaged into your scalp!