I take multi vitamin and creatine X3 from muscletech. Talking about the first it's really hard to feel the difference maybe just your over all better feeling. But the effect of creatine you may start notice in about a week. Then in a month your body will be loaded with it and you gonna need to take at least a month break to clean up your system.
I felt like 15-20% increase in body strength by taking creatine which is pretty amazing