Other sources have been reported to be around 65mg and 100mg.
There are several Jack3d knock-offs, many of which overload on the caffeine, and they do NOT come close to working as smoothly as Jack3d.
Personally, I believe that there is MUCH less than 150mg of caffeine in a scoop of Jack3d, and that there is slighly more 1,3 Dimethylamylamine (germanium extract) and Schizandrol A than expected. Were there more caffeine per scoop, you’d get a much worse caffeine crash.
Another thing is that nobody else has the Schizandrol A extract that USPLabs uses. This extract works far better than anything else out there, and they have it under lock and key.
Our GUESS on the amount of caffeine per scoop of Jack3d? 80mg. – but it doesn’t matter because we also don’t know how much 1,3 dimethylamylamine and Schizandrol A there is… and we also can’t get our hands on Schizandrol A.