Vitamin usage

Patient: I am 17 years and recently started using centrum performance. My main reason for this is to be able to stay up late hours in the night to study as i feel rather drowsy by 10pm under my own power. After telling a friend, he advised me to stay off centrum performance, as it is unhealthy due to my young age. However, I haven’t experienced any sort of side effects thus far. Can i please get some feedback ASAP.

Doctor: