Caffeine anhydrous is caffeine with the water removed, giving a concentrated, precisely measurable powder that's easy to dose consistently in a capsule.
Each SlimSet capsule contains 138 mg of caffeine anhydrous, a moderate dose comparable to a standard cup of coffee.
It's the most well-studied ingredient in the formula, with a large body of research on energy, alertness and focus. The link between caffeine alone and fat loss specifically is much weaker — energy and alertness support is the better-supported benefit.
Where it fits in SlimSet: Caffeine Anhydrous is one of three named ingredients in the formula. See how it's positioned to work on our how it works page.