Caffeine is the most widely consumed psychoactive drug on the planet despite being vilified as an evil and toxic substance. The fact is that caffeine can be both good and bad for you depending on your ability to metabolise caffeine, the amount that you consume and, crucially, how you get your caffeine fix.
Caffeine from tea has very different effects on your body compared with other forms of caffeinated drinks because it works synergistically with Theanine and Polyphenols to regulate its effects and speed of uptake.
So watch this video and arm yourself with all the knowledge that you need to maximise your performance and enjoyment of caffeine without those jitters.
----------------------
Video about storing tea between infusions
UPDATES:
Some sources say that Clonal tea has less Caffeine than Seed grown and others disagree so there is no consensus on this factor.
SOME REFERENCES:
Studies on caffeine in tea:
https://www.ncbi.nlm.nih.gov/pubmed/24522465
https://www.ncbi.nlm.nih.gov/pubmed/20722909
http://www.sciencedirect.com/science/article/pii/0963996996000385
http://lpi.oregonstate.edu/mic/food-beverages/tea
https://www.ncbi.nlm.nih.gov/pubmed/22285321
https://naldc.nal.usda.gov/naldc/download.xhtml?id=1807&content=PDF
Possible health benefits of caffeine:
http://www.caffeineinformer.com/top-10-caffeine-health-benefits
Roasting and Caffeine in coffee:
https://driftaway.coffee/caffeine/
Other Articles:
http://chadao.blogspot.co.uk/2008/02/caffeine-and-tea-myth-and-reality.html