Is subliminal messaging forbidden, and is it effective for increasing height? If it is forbidden, why?

This matter, promoted by some trainers and psychologists, has no scientific basis, no religious evidence, and no documented experiments. It is not supported by reason, religious law, or sensory experience, and such a thing is not permissible to do. We advise contentment with what Allah has allotted and gratitude to Him for His blessings.