Theanine is an amino acid commonly found in Green Tea. It is commonly taken as a supplement for its nootropic benefits.
- Improves learning and memory 
- Reduces mental and physical stress, improves mood 
- Cognitive enhancer and neuroprotectant 
- Reduces time to fall asleep and decreases number of nighttime awakenings 
What Is Theanine?
Theanine is an amino acid found in some plants including the basidiomycete mushroom and green tea. This nootropic is known to be a stress reliever and relaxant that also carries a number of nootropic properties. In 1964 theanine was approved by the Japanese Ministry of Health and Welfare for universal consumption. It is currently available in the United States as a dietary supplement and is confirmed by the FDA for being “Generally recognized as safe” 
Certain beverage manufacturers have begun to manufacture drinks containing thiamine and are currently marketing them as focus and concentration aids.  Other manufacturers are marketing them for their ability to help people relax. 
Theanine Dosage Information
Even though there is no standard dose for thiamine, many sources indicate a dose of 200-300mg should be taken as needed. Other people have found that they must take as much as 500mg at a time to notice an effect. I recommend you start with a 200mg dose and work your way up as needed. It will take 30-60 minutes for the dose to take effect and may last from 3-4 hours.
How Does Theanine Work?
- Acts as an analog to glutamine and glutamate 
- Significantly increased levels of serotonin and dopamine in the brain 
- Increases levels of the inhibitory transmitter GABA 
- Promotes alpha wave production in the brain.  Alpha waves play an important role in coordination and communication within the brain. 
Safety and Side Effects of Theanine
Taking theanine with medications for high blood pressure may cause your blood pressure to drop too low. Theanine may also decrease the effectiveness of certain stimulant medications. 
Below are some of the most commonly asked questions about Theanine.
Theanine is a proven nootropic that has many powerful effects when taken with caffeine. Not only that, but it has absolutely zero observed side effects over five decades of use. It improves a variety of cognitive functions, helps relieve stress, and acts as a neuroprotectant. Even if you don’t plan on starting an entire nootropic regimen you should consider purchasing theanine.
There is no downside to theanine in terms of safety or side effects but there is a huge potential upside. Taking a single dose in the morning with a cup of coffee could be the key to starting off your work day relaxed, focused, and more productive.
Theanine works in synergy with caffeine to improve cognition and mood. Studies have shown that taking caffeine and theanine lets to a faster numeric working memory, faster digit vigilance reaction time, improved information processing, less mental fatigue, faster reaction time, and improved verbal skills. Increased attentiveness was also observed for up to 3 hours.
A couple of studies have been conducted to observe the synergistic relationship between theanine and caffeine. One study subjected volunteers to difficult tests over the course of three days. Each day the volunteers were given either a placebo, 100 mg of theanine, 60 mg of caffeine, or both. Participants’ accuracy on the tests was slightly higher when they received either the theanine or caffeine over the placebo. However, the participants who received the theanine-caffeine combination had significantly higher accuracy and reported being much more attentive. The benefit from this combination lasted up to 3 hours. 
Another study conducted in 2007 examined theanine’s effect on physiological and psychological stressors. The study gave participants either a theanine or placebo dose as the start of an examination or halfway through. The experiment used strict time constraints and mental arithmetic tasks as stressors. Subjects which received the theanine dose showed a reduction in heart rate and salivary immunoglubin when compared to the placebo group. 
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