138mg a capsule, roughly what you'd get from a standard cup of brewed coffee.
Strip the water out of caffeine and you get caffeine anhydrous — a dry, concentrated powder that's easy to dose precisely. That precision is the whole point: you know exactly what you're getting, capsule to capsule.
SlimSet uses 138mg per capsule. That's a real, noticeable amount — enough that if you're also drinking coffee that day, it's worth doing the math on your total intake.
We won't oversell what caffeine does for weight loss, because the honest research on that link is thin. Where it earns its keep is alertness and reduced fatigue, and that's the primary reason it's the lead ingredient here.