Each SZN pouch contains 100 mg of caffeine, roughly the same as a strong cup of coffee, measured precisely so every pouch hits the same. Because the pouch rests under your lip, the caffeine absorbs through the oral mucosa rather than your gut: you may feel it start within as little as 5 minutes, with the dose taken up gradually rather than all in one go.
A few sensible notes:
Contains caffeine. Not recommended for children or pregnant women.
Start with one pouch and listen to your body before having more.
If you are sensitive to caffeine, avoid using a pouch close to bedtime. The Light Ritual (about 2 pouches a day) is built for lighter caffeine rhythms.