Height cannot be increased in the adult unless through surgery. In persons of less than 21 years old height increase is natural and can only be enhanced by the use of Human Growth Hormone (HGH) , however, the use of HGH is very dangerous and not indicated in the normal individual, it is reserved for growth and some specific disorders.
It is possible to obtain an increase in apparent height through some specific exercises and treatments that target posture and ligaments development.