A two capsule serving size of Qualia Focus contains 100 mg of caffeine (there’s 50 mg per capsule). This 100 mg amount of caffeine is found in about an 8 to 10-ounce cup of coffee. We chose this amount of caffeine because caffeine’s nootropic (i.e., brain performance) range is generally from 50-200mg, while 100-600mg of caffeine are used for ergogenic (i.e., exercise/sports) purposes. So the amount of caffeine in Qualia Focus is in the lower part of the range most commonly used for mental and physical performance purposes.