I recently came across something called subliminal messages. They are audios that have a hidden message that is sent to your subconscious mind. It supposedly reprograms your subconscious mind for success. There are many different ones and some claim that by listening to them, they can improve your confidence, help clear your skin and make you more beautiful, some say they can help you lose weight, get richer and even make someone fall in love with you. Its apparently being used in advertising a lot, but my question is, would this be haram or considered as shirk?

As long as you are confident that these messages are good, positive, and do not go against Islamic values and teachings, then you can listen to these subliminal messages. It is not haram or shirk.