Weight Gainers?

ok so im 16 and pretty skinny..im not anorexic cuz i know that im skinny and i want to gain wait..I own a good body but it wud be reliable with of late a couple more pounds and eating isn't helping at adjectives because of my metabolism...I would like to know if taking cargo gainers would be a good thought and if so then what helpful?...but if not afterwards is there a method to slow down my metabolism by eating contained by a certain method? well i don't know just about the weight gainers but i am a big being and my Dr told me to stay away from foods that have glorious fructose corn syrup, he said that it helps the grease build up in your body and is unyielding to get rotten