I'm 17 yrs old.i am patient of marfan syndrome.i want to gain muscles but after having good diet i didn't able to gain muscles just my height is growing after how much time my height will stop increasing ? can i go for weight gainer products?

Some thoughts: Have you had an ultrasound of your aortic root? (important) Have you asked your doc to do a bone maturity x-ray to determine how much longer you will grow taller? It can be estimated that way. Muscle mass gains are a product of resistance training in such forms as isometrics/barbells & weights/ resistance machines. A trainer can set up a safe program if your doc clears you for it.