Guide to Japanese Green Teas: Caffeine, Taste and How to Prepare


All teas are made from leaves, buds or other parts of the Camellia Sinensis plant commonly called the tea plant. Various processing techniques result in products such as black (sometimes called red,) oolong, white or green teas.

With the exception of green teas, all other teas are produced by methods involving various degrees of fermentation of parts of the tea plant. Green teas are produced by steaming and or roasting instead of fermentation, undergoing minimal oxidation compared to other teas. Thus, green teas are able to maintain the antioxidants which are the primary source of health benefits found in tea.

Not all green teas have a green color, though most do. The name “green tea” refers to teas which are produced without fermentation, including teas such as Hojicha roasted “green tea,” which actually has a reddish brown color.

About Caffeine

All teas contain caffeine.  According to research conducted by the Japanese government, black tea contains an average of 80 milligrams of caffeine for an 8 oz (240 ml) cup¹. This compares to an average of 150 milligrams for a brewed cup of coffee². The amount of caffeine in green tea varies from 24 milligrams for a cup of Bancha green tea to about 77 milligrams for a cup of Matcha¹.

PubMed (online database of US National Health Institute) lists a study seeks to explain the less stimulating effect of caffeine in tea to the fact that tea contains Theanine which is present in tea but not coffee³.

Other unconfirmed studies show that caffeine in tea is slower acting than coffee, takes longer to enter the blood stream and wears off slower. The caffeine in coffee is associated with a quick lift followed by a letdown. Thus, the caffeine in tea does not induce the effects commonly known as “coffee jolt.”

Green tea flavors

Caffeine ContentThe average caffeine content of one 8 oz cup (240 ml) of generic brewed coffee is about 150 milligrams².  Leaves of the tea plant contain more caffeine than its stem. The exact caffeine content of each type of green tea depends on the blend of leaves and stems and varies by brand.

Preparation Tips


1 – Standard Tables of Food Composition in Japan -2010. Research by Japan Ministry of Culture, Sports, Science, and Technology (in Japanese)

2- Caffeine content for coffee, tea, soda and more: Research by Mayo Clinic

3- Mood, blood pressure and cognitive performance effects of caffeine administered alone and together: PubMed – US National Health Institute

Matcha Organic Powdered Green Tea
100% organic. Super rich in antioxidants, the health benefits of Matcha tea by far exceed those of any other type of green tea. When you drink Matcha you ingest the whole tea leaf, not just the brewed water.

All Organic Japanese Green Teas

All of our teas are certified organic and come freshly packed from family growers in Japan, most of whom have been cultivating tea for generations.

Source by Tidbits