Green Tea, Oolong Tea, and Black Tea are produced from the leaves of Camellia Sinensis, which contains caffeine naturally. Caffeine amount in Green Tea, including matcha, Oolong Tea, and Black Tea are determined by the growing environment and post-harvest treatment. The fermentation and finishing process make the unique flavor and nutrition in each type of tea. Green Tea is not fermented at all. Oolong tea is half fermented. Black Tea is nearly completely fermented. This fermentation process, or the oxidation process, changes the natural substances in tea leaves, such as Caffeine and Catechins. “Catechins” are the most prominent antioxidants and the reason Green Tea has been at the center of scientists’ attention. Green tea leaves contain the highest amount of Catechins because the fermentation process decreases Catechins in the tea leaves.
Caffeine and Catechins (EGCG) relationship in tea leaves
Oxidation decreases Catechins and EGCG in tea leaves. There are two ways to stop oxidation after tea leaf is harvested: Steam or Panning. Both methods kill the enzyme causing oxidation in tea leaf. Scientific tests show tea steaming method offers higher Catechin & EGCG amount than the panning method.
Typically, Japanese green tea uses the steaming method, and Chinese green tea uses the panning method.
Caffeine in Green Tea
Caffeine amount in 8 oz of tea and coffee:
|Edible Green® , regular *||10mg|
|Edible Green® , decaf **||<3mg|
|Green Tea (brewed)||24 – 40mg|
|Black Tea||14 – 61mg|
|Coffee||95 – 240mg|
|Coffee, decaf||2 – 12 mg|
source: Caffeine amounts in other products are taking from mayoclinic.com.
* Edible Green® regular is Japanese Sencha green tea powder. One serving of Edible Green®, 1/4 tsp., contains about the same amount as in 1 bar of Hershey Chocolate bar (1.55oz), which contains 9 mg of Caffeine. Edible Green® regular offers about 1/10 of caffeine in regular coffee and offers much more Catechins than brewed green tea.
** Edible Green® decaffeinated still contains 95% of the EGCG antioxidants.
*** Matcha also contains a high dose of L-theanine naturally. L-theanine is a natural relaxant that calms the nervous system and increases alpha waves in the brain without causing drowsiness. A great balance of Caffeine and L-theanine creates “calm alertness” and provides steady energy. Read about: