Q:

Will taking MassGainer and Creatine risk damage to my body in long run?

I've been taking MassGainer for the last week and I am going to buy some Creatine soon.
This is my 5th year at the gym (I'm 28, 5'10", 68kg). I go thrice a week. I will never stop exercising (it's the way life is meant to be). I have a very tight, lean body with perfect cuts and shape. 
This year, I have decided to gain mass.
My question is whether, if I take MassGainer and Creatine and then stop taking it once its finished, my body will still crave for it, or if I will lose my mass if I stop taking it.

A:

Neither of these supplements are habit forming so no, your body will not "crave" them after you stop using them. However, the effects of both will subside when you stop taking them.
If you need to supplement a weight gainer to pack on mass, you will likely need to continue to keep your caloric intake at a certain level to continue to sustain your bulk.
With Creatine it's a little different. Effectively it allows you to push harder sets and the muscle gains made as a result are proportionally greater to the gains you'd make without supplementing. If you maintain at or just below the levels achieved during supplementation after you quit using creatine, most of those gains will remain. 

