Welcome aboard the creatine train. You are your own scientist.

I've been on 10g a day (in 2 - 5 g doses) for over a year. I'm 57 and 150 lbs. No stomach upset when I put it in my protein shakes. I notice the biggest differences in mid-heavy lifts, like power cleans at 75%.

AND...the unexpected big bonus...the mental clarity. Good luck with your experiment Diyana!