Often times with creatine, youll drop about 5lbs of water weight when you go off. Atleast thats been my experience. So if you gain 15lbs while on it, youll most likely keep 10. The extra strength and muscle endurance it gives you will allow you to lift heavier and get more reps and sets which will translate into building more muscle. The Cell-Tech has worked best for me. Not easy on the stomache but it works. So you can most likely go on it for a month or 2 and then stop and keep most of your gains. Some people dont respond to creatine, or so Ive heard, but its definately worth a try considering what it can do. Ive noticed strength increases only on chest though with creatine. If your looking to spend some more money Id reccomend NO2 by MRI, my strength has gone up majorly since I started on it. Hope that helps