It's a fair amount so anyone sensitive to caffeine should try 1/2 serving to begin with. I wouldn't say it is a big amount though. My last pre workout had 350mg caffeine per scoop. Many pre workouts have less caffeine per scoop but they have less of everything else so you need 2-3 scoops for them to come to life. You should only use 1 scoop and as mentioned above it has no fillers and just full of effective ingredients. If you want to try a tub just let me know.