An Amino Acid found in plants which was first referred to by Dr. R. L. Wickremasinghe in 1978 in context of its influence on the quality of tea. Subsequent research conducted in Japan and elsewhere suggests that L-theanine facilitates relaxation and may benefit the regulation of blood pressure in humans, as well as mental clarity, concentration and the immune system.
L-theanine is different to caffeine in producing a calming effect. It is the predominant amino acid component in tea and whilst the amount of L-theanine in tea depends on several factors – climate, soil and sunlight – clinical studies suggest that consuming 6-8 cups of tea a day would offer 200-400mg of L-theanine whilst it is said to be effective in doses ranging from 50mg to 200mg.
Fresh Tea in particular is likely to be rich in L-theanine and researchers recommend it, amongst other things, for coping with stress and also for increasing ‘life energy’.