Is your hair dry and damaged due to you using too much product/straightening/dying?
If you have looked after your hair and it's still dry and damaged looking it could be anything due to poor diet, lack of vitamins/minerals, hormonal issuesm, thyroid problem.
If it's bad due to mistreatment, then you might need a good cut and regular conditioning treatments along with a gentle shampoo and a rich conditioner.
If it's due to diet, vitamins, hormones, or thyroid, then using a particular shampoo will not correct your hair. You need to fix the underlying problem first.