Theanine

Theanine and caffeine are the same thing considering their composition. The most important linkages are highly condensated tannins.
Caffeine is contained in the tea leaf with a concentration of 1.5 - 4.5%. Thanks to this, as well as its combination with the tannins, the tea receives its unique soothing effect. The caffeine in the tea directly affects the blood circulation of our central nerv system. Caffeine is bound to other substances and builds a complex. There is bound and unbound caffeine. Free caffeine dissolves within the first 90 seconds, afterwards, the caffeine which is bound to the tannins dissolves. Due to this, the tea becomes bitter but also the absorption of the caffeine in stomach and intestine is slowed. Tea also contains ethereal oils, minerals, trace elements and a high portion of vitamins. Young tea leaves contain more caffeine while older tea leaves contain a higher proportion of tannin.

Caffeine content:
170 ml Darjeeling 77 mg
170 ml Fuji Tea 78 mg
170 ml Gunpowder 61 mg
170 ml Bancha Tea 22 mg
150 ml Coffee 123 mg
300 ml Coke 27 mg

A maximum of 85% of the caffeine content of the leaves can be removed.

Further substances in green tea:
alkaloids: caffeine, theophyllin
tannins/flavonole)/
(polyphenols): catechin, tannin
minerals: fluoride, iron, magnesium, nickel, zinc, copper
vitamins: C, A1, B1, B2, B12, E, P
Amino acids: theanine
aroma substances

Effects of green tea:
vitalising
catches free radicals 20 x better than vitamine E
removes bad breath
normalises elevated blood sugar
prevents tooth decay (1 cup of green tea per day decreases caries by 50% due to its fluoride content)
normalises high blood pressure
reduces the cholesterol level
reduces threat of cardiac arrest
healthy during pregnancies due to its high zinc content

the contained Epigallo-Catechingallat (EGCG) hinders the development of metastases and cancer cells