Some independent info here : https://coffeeaffection.com/coffee-and-l-theanine/
Taken alone, the popular supplement L-Theanine has been show in research to be an effective mood enhancer. But when this safe amino acid is combined with caffeine, such as in SuprNatural coffee blends, there can be a pronounced, clinically proven, synergistic effect. This means you may experience heightened focus, awareness, and energy, as well as reduced stress and improved mental endurance to even higher levels. All this while enjoying fewer of the jitters and anxiety that caffeine can sometimes deliver. Discover the zen of SuprNatural coffee blends from the experienced team at Geek Grind and rediscover coffee again!
SuprNatural coffee is 100% Colombian dark-roast coffee crafted with the addition of L-Theanine which is a naturally occurring amino acid found in green and black tea as well as various mushrooms. It was first discovered in 1949 in tea and has since been extensively studied as is used for reducing anxiety, improving mood, helping with ADHD, for improving focus and concentration, as an effective sleep aid. It has been approved for unlimited use in food as far back and 1969 in Japan and has since become very popular in the US due to its benefits when consumed specifically with caffeine such as that in our SuprNatural coffee.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.