我17歲，常常睡了8小時 還是眼訓，而且喝咖啡, 健康飲品，效用不大，因此想買藥提神。

少食肉，多吃蔬果，多做運動，在10-11時上床睡，或許你需要更多睡眠，有些人每天需要9-10小時的睡眠的。

最好唔好亂買藥食，一係睇下醫生，一係搵日得閒，訓足一日，之後就會好好多嫁喇~

請看註冊中醫

from your case, it's seem like you lack of exercise and vitamin C.
maybe you should try exercise a bit and buy multi-vitamin to consume.
it can really boost up your energy and u feel more healthy as well.