L-Theanine and Caffeine Stack

L-Theanine from green tea smooths caffeine stimulant profile by increasing alpha brain waves and reducing jitteriness without blunting focus. The 2008 Nutritional Neuroscience study shows the combination outperforms caffeine alone on accuracy and attention tasks. The ratio matters: 2-to-1 theanine to caffeine such as 200mg theanine with 100mg caffeine. Works within 30 to 45 minutes with minimal side effects.