Apetamin alternatives? GAIN WEIGHT

I want to find a safe way to gain weight and I haven’t had much luck for the past year (I’ve gained five pounds and now I’m 93 but my ultimate goal is 110 lbs) but I’m afraid my parents won’t be alright with me taking apetamin/ it might not be good for a 15 year old for whatever reason. Any safe alternatives for increasing appetite and slowing metabolism? (I already drink ensure and I’m somehow technically a healthy weight so my doctor hasn’t given any advice but next checkup I’m going to ask). I don’t expect serious medical help but advice based on experience is always helpful and I’m capable of researching too and asking my doctor before I make big changes