Theanine is an amino acid found in high levels in tea, and is believed to contribute to the relaxing properties that accompany tea consumption, while it has been shown to increase levels of GABA (neurotransmitters) and A waves in the brain, resulting in a calming effect without the appearance of accompanying drowsiness. It is useful in times of stress and anxiety, completely safe and does not cause addiction. Some research links thiamine to immune system health as the Alkylamines naturally contained in Thiamine can help increase the activation of white blood cells. Finally, it is a highly active product in a dosage of one capsule per day.