Depende sa pangangatawan mo sir, depende rin sa amino na tinatake mo. suggest to start slow maybe 10g tapos incremental na lang. side effects? Some people tinitigyawat mostly sa likod and other body parts. I go with big boss's tip also its all good. Amino lang naman helps with protein absorption, so much of your protein input doesn't go to waste.
Rely most of your protein intake from natural food like white meat, egg white (ok din ung pula pero pakonti konti lang) and small percentage from supplements since your just starting out.