L-theanine is an amino acid found in tea leaves. It promotes a calm, alert feeling without causing drowsiness. That combination makes it useful for daily stress management.
People take it to relax, improve sleep, and sharpen focus. Paired with caffeine, it can smooth out the jitters while keeping the mind clear. Others use it to unwind in the evening or ease anxious feelings.
Capsule and powder forms are common. A typical dose falls between 100 and 200 mg. Take it with food or on an empty stomach. Combining it with caffeine often boosts concentration.
Some people get drowsy, so skip driving if that happens. It can interact with sedatives or blood pressure medications. Anyone pregnant, nursing, or taking medication should check with a healthcare professional first.