I'm a teen trying to add muscle. what things should i do?

Good nutrition!: The best way to add muscle is good nutrition and exercise. Getting a good supply of protein --- reducing fatty and fried foods-- green leafy veggies, etc, all are great. Exercise is very helpful in building muscle. Supplements are often high in calories and my contain harmful additives (lecithin; creatine), that can affect kidney function. There is no easy path to muscle!