• Caffeine-free and gluten-free Onnit Alpha Brain helps boost alpha waves in the brain. In doing so, it allows the brain to produce more neurotransmitters, which allows your brain to operate faster. Since there s no caffeine, it s not a jittery, anxious kind of fast-running, but a calm and sure variety. L-theanine allows the supplement to boost and protect memory while enhancing mental clarity and improving verbal memory, even if you re under extreme stress. Alpha Brain helps adults reach the optimal level of concentration, with some reporting performance beyond what they thought possible of themselves. Users have reported no side effects when taking the recommended dose, which allows them to feel the change in energy and cognitive performance for 6-8 hours.